{ "schema_version": 1, "dataset": "home-energy/tankless-vs-tank-water-heater", "title": "Tankless vs tank water heater: yearly saving and payback by state", "page_url": "https://infohelper.net/home-energy/tankless-vs-tank-water-heater", "license": "CC BY 4.0", "cite": "Cite the page: https://infohelper.net/home-energy/tankless-vs-tank-water-heater", "license_note": "The computed tables are ours, under CC BY 4.0. The underlying EIA and ENERGY STAR data are works of the US government.", "generated_at": "2026-10-14T12:35:41Z", "data_changed_at": "2026-10-14", "content_hash": "sha256:4a09c871c1d61ce5a4df0d544c5a938e68ff373c1a1b70fcb5700bee3d7fdaff", "changes": [ { "date": "2026-10-14", "text": "Figures recalculated from updated source data." }, { "date": "2026-10-14", "text": "First published with prices for the 12 months to Jul 2026." } ], "run": { "suspicious": false, "forced": false, "findings": [] }, "sources": [ { "id": "eia-bulk-elec", "publisher": "U.S. Energy Information Administration", "name": "EIA bulk file ELEC: electricity (Forms EIA-861M / EIA-861)", "url": "https://www.eia.gov/opendata/bulk/ELEC.zip", "page_url": "https://www.eia.gov/electricity/data/browser/", "last_updated": "2026-09-23T17:01:12-04:00", "fetched_at": "2026-10-13T22:45:58Z", "used_for": "residential electricity revenue, sales and price by state, monthly" }, { "id": "eia-bulk-ng", "publisher": "U.S. Energy Information Administration", "name": "EIA bulk file NG: natural gas (Forms EIA-857 / EIA-176)", "url": "https://www.eia.gov/opendata/bulk/NG.zip", "page_url": "https://www.eia.gov/dnav/ng/ng_pri_sum_a_EPG0_PRS_DMcf_m.htm", "last_updated": "2026-10-08T15:05:12-04:00", "fetched_at": "2026-10-13T22:46:01Z", "used_for": "residential natural gas price and consumption by state, monthly and annual; heat content; number of residential consumers" }, { "id": "eia-bulk-pet", "publisher": "U.S. Energy Information Administration", "name": "EIA bulk file PET: petroleum (weekly heating oil and propane prices)", "url": "https://www.eia.gov/opendata/bulk/PET.zip", "page_url": "https://www.eia.gov/petroleum/heatingoilpropane/", "last_updated": "2026-10-07T17:59:25-04:00", "fetched_at": "2026-10-13T22:46:02Z", "used_for": "residential propane and heating oil price by state, weekly, October–March" }, { "id": "energy-star-pbpq-swnu", "publisher": "ENERGY STAR (U.S. EPA)", "name": "ENERGY STAR Certified Water Heaters", "url": "https://data.energystar.gov/d/pbpq-swnu", "page_url": "https://data.energystar.gov/d/pbpq-swnu", "last_updated": "2026-10-13", "fetched_at": "2026-10-14T12:35:52Z", "used_for": "efficiency of the certified models" } ], "formula_version": "tankless/1", "prices_formula_version": "home-energy-prices/1", "period": { "label": "12 months to Jul 2026", "electricity": { "start": "2025-08", "end": "2026-07", "label": "12 months to Jul 2026" }, "gas": { "start": "2025-08", "end": "2026-07", "label": "12 months to Jul 2026" }, "gas_regression": { "start": "2023-08", "end": "2026-07", "label": "36 months to Jul 2026" }, "winter": { "start": "2025-11", "end": "2026-03", "label": "Nov 2025–Mar 2026" }, "heating_season": { "start": "2025-10", "end": "2026-03", "label": "Oct 2025–Mar 2026" } }, "assumptions": { "main_household": "medium", "gas_price": "The page prints the \"estimated\" view: gas at the estimated price of one more therm (the monthly charge taken out; state-prices.json gas_estimated), because a tankless heater changes the therms burned, not the monthly charge. Where the estimate does not hold (9 states today) the view uses the EIA average and says so (gas_price_basis = eia_average_fallback); there the saving is an upper bound. The \"eia_average\" view, the one gas price of the other pair pages, is kept for comparison and equals the gas vs electric page.", "basic_models": "The gas tank, the electric tank, the basic gas tankless heater and the electric tankless heater are at the federal minimum efficiency (10 CFR 430.32(d)(1)); the gas tankless heater and the heat pump water heater are the median ENERGY STAR certified models.", "tankless_at_every_draw": "A tankless heater has no stored water to lose heat from, so one UEF serves every level of use: the federal minimum is itself flat (0.81 at low, medium and high use) and ENERGY STAR rates 458 of 460 gas tankless models at high use only.", "other_draws": "Low and high use apply the federal minimum of that draw pattern to the same tank: a model, not a rating.", "life": "Over 20 years: DOE's estimate of the average life of a gas tankless heater (89 FR 105241), cited, not computed.", "no_prices": "No purchase or installation price is used: no open source publishes one. Payback is given as years per $1,000 of extra price, for the reader to scale by their own quotes.", "tankless_electricity": "The electricity a gas tankless heater uses (ignition, fan, controls) is not in open data and is not counted.", "propane": "Propane heaters are priced with the same efficiency as the natural gas machine and 91,452 Btu per gallon; an assumption.", "flow": "Flow at another incoming water temperature = the rated maximum flow × 67 ÷ (125 − incoming °F): the same burner heats fewer gallons a minute through a larger rise. Electric power = gallons a minute × 8.24 lb × 60 minutes × rise ÷ 3,412 Btu per kWh; amps = watts ÷ 240 V." }, "methods": { "energy_per_year": "Heat delivered Q = 365 × gallons a day × 8.24 lb/gal × 1.00 Btu/(lb·°F) × 67 °F. Gas: therms = Q ÷ UEF ÷ 100,000. Electric resistance: kWh = Q ÷ UEF ÷ 3,412. Heat pump: the median electric_usage_kwh_yr of the ENERGY STAR models rated at that draw pattern.", "cost": "cost per year = therms × gas $/therm or kWh × electricity $/kWh, from the prices in the same row; per month = per year ÷ 12.", "shower": "A shower is 2.5 gallons a minute (the federal showerhead maximum) at 105 °F, mixed from 125 °F hot water and the incoming water: the 105 °F is our assumption. The all-hot case (every gallon at 125 °F) is kept beside it.", "saving": "saving a year = gas tank cost − gas tankless cost (same fuel, same hot water). Years per $1,000 = 1,000 ÷ saving, one decimal. Saved over the heater's life = the saving in whole dollars × 20.", "us": "The US figures use the US row of state-prices.json (EIA national series), not a mean of the states." }, "machines": { "gas_tank": { "label": "Gas tank, the basic model", "basis": "federal_minimum", "selection": "Federal minimum UEF for a gas-fired storage heater of 20–55 gallons made before 2029-05-06, at 40 gallons", "gallons": 40.0, "uef_by_draw": { "low": 0.5222, "medium": 0.5803, "high": 0.64 }, "status": "assumed" }, "gas_tankless": { "label": "Gas tankless, ENERGY STAR certified (condensing)", "basis": "energy_star_median", "selection": "type = \"Gas Tankless\"; median uniform_energy_factor_uef, used at every draw pattern", "uef": 0.95, "uef_min": 0.95, "uef_max": 0.98, "models": 460, "status": "verified" }, "gas_tankless_basic": { "label": "Gas tankless, the basic model (non-condensing)", "basis": "federal_minimum", "selection": "Federal minimum UEF for a gas-fired instantaneous heater, the same at low, medium and high use", "uef": 0.81, "status": "verified" }, "electric_tank": { "label": "Electric tank, the basic model", "basis": "federal_minimum", "selection": "Federal minimum UEF for an electric storage heater of 20–55 gallons made before 2029-05-06, at 50 gallons", "gallons": 50.0, "uef_by_draw": { "low": 0.9104, "medium": 0.9207, "high": 0.9299 }, "status": "assumed" }, "electric_tankless_basic": { "label": "Electric tankless, the federal minimum", "basis": "federal_minimum", "selection": "Federal minimum UEF for an electric instantaneous heater under 2 gallons", "uef_by_draw": { "low": 0.91, "medium": 0.91, "high": 0.92 }, "status": "verified" }, "electric_tankless_ceiling": { "label": "Electric tankless, the most it can reach", "basis": "physical_limit", "selection": "UEF 1.00: resistance heat cannot exceed the electricity used", "uef": 1.0, "status": "verified" }, "heat_pump": { "label": "Heat pump water heater, ENERGY STAR certified", "basis": "energy_star_median", "selection": "type = \"Hybrid/Electric Heat Pump\"; median electric_usage_kwh_yr of the models rated at the draw pattern", "by_draw": { "low": { "kwh_per_year": 780.0, "uef": 2.8, "models": 16 }, "medium": { "kwh_per_year": 902.0, "uef": 3.52, "models": 268 }, "high": { "kwh_per_year": 1279.0, "uef": 3.8, "models": 314 } }, "status": "verified" } }, "household": { "low": { "gallons_per_day": 38.0, "heat_delivered_btu_per_year": 7657350.0, "heat_delivered_therms_per_year": 76.57, "energy_per_year": { "gas_tank_therms": 146.64, "gas_tankless_therms": 80.6, "gas_tankless_basic_therms": 94.54, "electric_tank_kwh": 2465.1, "electric_tankless_basic_kwh": 2466.2, "electric_tankless_ceiling_kwh": 2244.2, "heat_pump_kwh": 780.0, "propane_tank_gallons": 160.3, "propane_tankless_gallons": 88.1 }, "therms_saved_per_year": 66.04, "therms_saved_basic_per_year": 52.1 }, "medium": { "gallons_per_day": 55.0, "heat_delivered_btu_per_year": 11083006.0, "heat_delivered_therms_per_year": 110.83, "energy_per_year": { "gas_tank_therms": 190.99, "gas_tankless_therms": 116.66, "gas_tankless_basic_therms": 136.83, "electric_tank_kwh": 3528.0, "electric_tankless_basic_kwh": 3569.5, "electric_tankless_ceiling_kwh": 3248.2, "heat_pump_kwh": 902.0, "propane_tank_gallons": 208.8, "propane_tankless_gallons": 127.6 }, "therms_saved_per_year": 74.33, "therms_saved_basic_per_year": 54.16 }, "high": { "gallons_per_day": 84.0, "heat_delivered_btu_per_year": 16926773.0, "heat_delivered_therms_per_year": 169.27, "energy_per_year": { "gas_tank_therms": 264.48, "gas_tankless_therms": 178.18, "gas_tankless_basic_therms": 208.97, "electric_tank_kwh": 5334.9, "electric_tankless_basic_kwh": 5392.3, "electric_tankless_ceiling_kwh": 4961.0, "heat_pump_kwh": 1279.0, "propane_tank_gallons": 289.2, "propane_tankless_gallons": 194.8 }, "therms_saved_per_year": 86.3, "therms_saved_basic_per_year": 55.51 } }, "flow": { "rated_supply_f": 58.0, "outlet_f": 125.0, "rated_rise_f": 67.0, "shower_gpm": 2.5, "shower_f": 105.0, "supply_volts": 240.0, "electric_class_max_kw": 12.0, "certified_gas_tankless": { "max_gpm": { "median": 5.4, "min": 3.8, "max": 6.0, "models": 459 }, "min_gpm": { "median": 1.0, "min": 0.1, "max": 1.0, "models": 459 }, "input_btu_per_hour": { "median": 180000.0, "min": 130000.0, "max": 199000.0, "models": 458, "left_out": 2 }, "max_amps": { "median": 5.0, "min": 0.5, "max": 15.0, "models": 460 }, "models_drawing_current": 460, "models": 460, "vent_types": { "Direct Vent": 109, "Power Direct Vent": 273, "Power Vent": 224 }, "fuel": { "Natural Gas": 172, "Natural Gas, Propane": 148, "Propane": 140 } }, "certified_gas_storage": { "input_btu_per_hour": { "median": 50000.0, "min": 50000.0, "max": 65000.0, "models": 71, "left_out": 0 }, "first_hour_rating_gallons": { "median": 95.0, "min": 86.0, "max": 118.0, "models": 71 }, "max_amps": { "median": 7.0, "min": 2.0, "max": 7.0, "models": 71 }, "models": 71 }, "by_supply": [ { "supply_f": 40, "rise_f": 85.0, "gas_tankless_gpm": 4.3, "showers": 1.7, "electric_kw_one_shower": 30.8, "electric_amps_one_shower": 128, "electric_kw_two_showers": 61.6, "electric_amps_two_showers": 257, "shower_hot_share": 0.76, "showers_mixed": 2.2, "electric_kw_one_shower_mixed": 23.5, "electric_amps_one_shower_mixed": 98, "electric_kw_two_showers_mixed": 47.1, "electric_amps_two_showers_mixed": 196, "gpm_at_class_limit_mixed": 1.27, "gpm_at_class_limit": 0.97 }, { "supply_f": 50, "rise_f": 75.0, "gas_tankless_gpm": 4.8, "showers": 1.9, "electric_kw_one_shower": 27.2, "electric_amps_one_shower": 113, "electric_kw_two_showers": 54.3, "electric_amps_two_showers": 226, "shower_hot_share": 0.73, "showers_mixed": 2.6, "electric_kw_one_shower_mixed": 19.9, "electric_amps_one_shower_mixed": 83, "electric_kw_two_showers_mixed": 39.8, "electric_amps_two_showers_mixed": 166, "gpm_at_class_limit_mixed": 1.51, "gpm_at_class_limit": 1.1 }, { "supply_f": 58, "rise_f": 67.0, "gas_tankless_gpm": 5.4, "showers": 2.2, "electric_kw_one_shower": 24.3, "electric_amps_one_shower": 101, "electric_kw_two_showers": 48.5, "electric_amps_two_showers": 202, "shower_hot_share": 0.7, "showers_mixed": 3.1, "electric_kw_one_shower_mixed": 17.0, "electric_amps_one_shower_mixed": 71, "electric_kw_two_showers_mixed": 34.1, "electric_amps_two_showers_mixed": 142, "gpm_at_class_limit_mixed": 1.76, "gpm_at_class_limit": 1.24 }, { "supply_f": 70, "rise_f": 55.0, "gas_tankless_gpm": 6.6, "showers": 2.6, "electric_kw_one_shower": 19.9, "electric_amps_one_shower": 83, "electric_kw_two_showers": 39.8, "electric_amps_two_showers": 166, "shower_hot_share": 0.64, "showers_mixed": 4.1, "electric_kw_one_shower_mixed": 12.7, "electric_amps_one_shower_mixed": 53, "electric_kw_two_showers_mixed": 25.4, "electric_amps_two_showers_mixed": 106, "gpm_at_class_limit_mixed": 2.37, "gpm_at_class_limit": 1.51 } ] }, "life": { "gas_tankless_years": 20.0, "gas_tank_years_low": 14.0, "gas_tank_years_high": 15.0, "source": "89 FR 105241 (2024-12-26): \"The estimated average lifetime for a gas-fired instantaneous water heater is about 20 years, whereas gas-fired storage water heaters operate for about 14 to 15 years.\"", "source_url": "https://www.federalregister.gov/documents/2024/12/26/2024-30369/energy-conservation-program-energy-conservation-standards-for-consumer-gas-fired-instantaneous-water", "checked_on": "2026-10-14", "status": "cited" }, "energy_star": { "dataset": "pbpq-swnu", "name": "ENERGY STAR Certified Water Heaters", "rows": 1256, "rows_updated_at": "2026-10-13", "fetched_at": "2026-10-14T12:35:52Z", "from_cache": false }, "constants": [ { "key": "btu_per_kwh", "value": 3412.0, "unit": "Btu/kWh", "source": "10 CFR 430 Subpart B Appendix D2, eCFR as of 2026-09-01, section 4.4", "source_url": "https://www.ecfr.gov/api/versioner/v1/full/2026-09-01/title-10.xml?part=430&appendix=Appendix%20D2%20to%20Subpart%20B%20of%20Part%20430", "checked_on": "2026-10-13", "status": "verified", "note": "" }, { "key": "btu_per_therm", "value": 100000.0, "unit": "Btu/therm", "source": "EIA, Units and calculators", "source_url": "https://www.eia.gov/energyexplained/units-and-calculators/", "checked_on": "2026-10-13", "status": "verified", "note": "" }, { "key": "btu_per_gallon_propane", "value": 91452.0, "unit": "Btu/gal", "source": "EIA, Units and calculators", "source_url": "https://www.eia.gov/energyexplained/units-and-calculators/", "checked_on": "2026-10-13", "status": "verified", "note": "" }, { "key": "wh.gallons_per_day_low", "value": 38.0, "unit": "gal/day", "source": "10 CFR 430 Subpart B Appendix E, section 6.3.9, eCFR as of 2026-10-08", "source_url": "https://www.ecfr.gov/current/title-10/chapter-II/subchapter-D/part-430/subpart-B/appendix-Appendix%20E%20to%20Subpart%20B%20of%20Part%20430", "checked_on": "2026-10-13", "status": "verified", "note": "" }, { "key": "wh.gallons_per_day_medium", "value": 55.0, "unit": "gal/day", "source": "10 CFR 430 Subpart B Appendix E, section 6.3.9, eCFR as of 2026-10-08", "source_url": "https://www.ecfr.gov/current/title-10/chapter-II/subchapter-D/part-430/subpart-B/appendix-Appendix%20E%20to%20Subpart%20B%20of%20Part%20430", "checked_on": "2026-10-13", "status": "verified", "note": "" }, { "key": "wh.gallons_per_day_high", "value": 84.0, "unit": "gal/day", "source": "10 CFR 430 Subpart B Appendix E, section 6.3.9, eCFR as of 2026-10-08", "source_url": "https://www.ecfr.gov/current/title-10/chapter-II/subchapter-D/part-430/subpart-B/appendix-Appendix%20E%20to%20Subpart%20B%20of%20Part%20430", "checked_on": "2026-10-13", "status": "verified", "note": "" }, { "key": "wh.water_density_lb_per_gallon", "value": 8.24, "unit": "lb/gal", "source": "10 CFR 430 Subpart B Appendix E, section 6.3.9, eCFR as of 2026-10-08", "source_url": "https://www.ecfr.gov/current/title-10/chapter-II/subchapter-D/part-430/subpart-B/appendix-Appendix%20E%20to%20Subpart%20B%20of%20Part%20430", "checked_on": "2026-10-13", "status": "verified", "note": "" }, { "key": "wh.water_specific_heat", "value": 1.0, "unit": "Btu/(lb·°F)", "source": "10 CFR 430 Subpart B Appendix E, section 6.3.9, eCFR as of 2026-10-08", "source_url": "https://www.ecfr.gov/current/title-10/chapter-II/subchapter-D/part-430/subpart-B/appendix-Appendix%20E%20to%20Subpart%20B%20of%20Part%20430", "checked_on": "2026-10-13", "status": "verified", "note": "" }, { "key": "wh.temperature_rise_f", "value": 67.0, "unit": "°F", "source": "10 CFR 430 Subpart B Appendix E, section 6.3.9, eCFR as of 2026-10-08 (125 °F out, 58 °F in)", "source_url": "https://www.ecfr.gov/current/title-10/chapter-II/subchapter-D/part-430/subpart-B/appendix-Appendix%20E%20to%20Subpart%20B%20of%20Part%20430", "checked_on": "2026-10-13", "status": "verified", "note": "One inlet temperature for every state; real incoming water is colder in the north." }, { "key": "wh.days_per_year", "value": 365.0, "unit": "days", "source": "10 CFR 430 Subpart B Appendix E, section 6.3.9, eCFR as of 2026-10-08", "source_url": "https://www.ecfr.gov/current/title-10/chapter-II/subchapter-D/part-430/subpart-B/appendix-Appendix%20E%20to%20Subpart%20B%20of%20Part%20430", "checked_on": "2026-10-13", "status": "verified", "note": "" }, { "key": "wh.gas_tank_gallons", "value": 40.0, "unit": "gal", "source": "Model choice: the common 40-gallon gas tank", "source_url": "https://www.ecfr.gov/current/title-10/chapter-II/subchapter-D/part-430/subpart-C/section-430.32", "checked_on": "2026-10-13", "status": "assumed", "note": "\"The basic model is the federal minimum\" is an assumption about what is on the shelf; DOE certification data (CCMS, read 2026-10-13) gives a median UEF of 0.60 for 474 gas tanks of 36–45 gallons at medium use, against the minimum 0.58." }, { "key": "wh.electric_tank_gallons", "value": 50.0, "unit": "gal", "source": "Model choice: the common 50-gallon electric tank", "source_url": "https://www.ecfr.gov/current/title-10/chapter-II/subchapter-D/part-430/subpart-C/section-430.32", "checked_on": "2026-10-13", "status": "assumed", "note": "CCMS median UEF 0.93 for 325 electric tanks of 46–55 gallons at medium use, against the minimum 0.92." }, { "key": "wh.gas_tank_uef_min_intercept_low", "value": 0.5982, "unit": "UEF", "source": "10 CFR 430.32, eCFR as of 2026-10-08 (d)(1), gas-fired storage 20–55 gal, made before 2029-05-06", "source_url": "https://www.ecfr.gov/current/title-10/chapter-II/subchapter-D/part-430/subpart-C/section-430.32", "checked_on": "2026-10-13", "status": "verified", "note": "" }, { "key": "wh.gas_tank_uef_min_slope_low", "value": 0.0019, "unit": "UEF/gal", "source": "10 CFR 430.32, eCFR as of 2026-10-08 (d)(1), gas-fired storage 20–55 gal, made before 2029-05-06", "source_url": "https://www.ecfr.gov/current/title-10/chapter-II/subchapter-D/part-430/subpart-C/section-430.32", "checked_on": "2026-10-13", "status": "verified", "note": "" }, { "key": "wh.gas_tank_uef_min_intercept_medium", "value": 0.6483, "unit": "UEF", "source": "10 CFR 430.32, eCFR as of 2026-10-08 (d)(1), gas-fired storage 20–55 gal, made before 2029-05-06", "source_url": "https://www.ecfr.gov/current/title-10/chapter-II/subchapter-D/part-430/subpart-C/section-430.32", "checked_on": "2026-10-13", "status": "verified", "note": "" }, { "key": "wh.gas_tank_uef_min_slope_medium", "value": 0.0017, "unit": "UEF/gal", "source": "10 CFR 430.32, eCFR as of 2026-10-08 (d)(1), gas-fired storage 20–55 gal, made before 2029-05-06", "source_url": "https://www.ecfr.gov/current/title-10/chapter-II/subchapter-D/part-430/subpart-C/section-430.32", "checked_on": "2026-10-13", "status": "verified", "note": "" }, { "key": "wh.gas_tank_uef_min_intercept_high", "value": 0.692, "unit": "UEF", "source": "10 CFR 430.32, eCFR as of 2026-10-08 (d)(1), gas-fired storage 20–55 gal, made before 2029-05-06", "source_url": "https://www.ecfr.gov/current/title-10/chapter-II/subchapter-D/part-430/subpart-C/section-430.32", "checked_on": "2026-10-13", "status": "verified", "note": "" }, { "key": "wh.gas_tank_uef_min_slope_high", "value": 0.0013, "unit": "UEF/gal", "source": "10 CFR 430.32, eCFR as of 2026-10-08 (d)(1), gas-fired storage 20–55 gal, made before 2029-05-06", "source_url": "https://www.ecfr.gov/current/title-10/chapter-II/subchapter-D/part-430/subpart-C/section-430.32", "checked_on": "2026-10-13", "status": "verified", "note": "" }, { "key": "wh.electric_tank_uef_min_intercept_low", "value": 0.9254, "unit": "UEF", "source": "10 CFR 430.32, eCFR as of 2026-10-08 (d)(1), electric storage 20–55 gal, made before 2029-05-06", "source_url": "https://www.ecfr.gov/current/title-10/chapter-II/subchapter-D/part-430/subpart-C/section-430.32", "checked_on": "2026-10-13", "status": "verified", "note": "" }, { "key": "wh.electric_tank_uef_min_slope_low", "value": 0.0003, "unit": "UEF/gal", "source": "10 CFR 430.32, eCFR as of 2026-10-08 (d)(1), electric storage 20–55 gal, made before 2029-05-06", "source_url": "https://www.ecfr.gov/current/title-10/chapter-II/subchapter-D/part-430/subpart-C/section-430.32", "checked_on": "2026-10-13", "status": "verified", "note": "" }, { "key": "wh.electric_tank_uef_min_intercept_medium", "value": 0.9307, "unit": "UEF", "source": "10 CFR 430.32, eCFR as of 2026-10-08 (d)(1), electric storage 20–55 gal, made before 2029-05-06", "source_url": "https://www.ecfr.gov/current/title-10/chapter-II/subchapter-D/part-430/subpart-C/section-430.32", "checked_on": "2026-10-13", "status": "verified", "note": "" }, { "key": "wh.electric_tank_uef_min_slope_medium", "value": 0.0002, "unit": "UEF/gal", "source": "10 CFR 430.32, eCFR as of 2026-10-08 (d)(1), electric storage 20–55 gal, made before 2029-05-06", "source_url": "https://www.ecfr.gov/current/title-10/chapter-II/subchapter-D/part-430/subpart-C/section-430.32", "checked_on": "2026-10-13", "status": "verified", "note": "" }, { "key": "wh.electric_tank_uef_min_intercept_high", "value": 0.9349, "unit": "UEF", "source": "10 CFR 430.32, eCFR as of 2026-10-08 (d)(1), electric storage 20–55 gal, made before 2029-05-06", "source_url": "https://www.ecfr.gov/current/title-10/chapter-II/subchapter-D/part-430/subpart-C/section-430.32", "checked_on": "2026-10-13", "status": "verified", "note": "" }, { "key": "wh.electric_tank_uef_min_slope_high", "value": 0.0001, "unit": "UEF/gal", "source": "10 CFR 430.32, eCFR as of 2026-10-08 (d)(1), electric storage 20–55 gal, made before 2029-05-06", "source_url": "https://www.ecfr.gov/current/title-10/chapter-II/subchapter-D/part-430/subpart-C/section-430.32", "checked_on": "2026-10-13", "status": "verified", "note": "" }, { "key": "wh.gas_tankless_uef_min", "value": 0.81, "unit": "UEF", "source": "10 CFR 430.32, eCFR as of 2026-10-08 (d)(1), gas-fired instantaneous", "source_url": "https://www.ecfr.gov/current/title-10/chapter-II/subchapter-D/part-430/subpart-C/section-430.32", "checked_on": "2026-10-13", "status": "verified", "note": "Not used by the gas vs electric page (it shows the certified median); kept for the tankless page." }, { "key": "tankless.electric_uef_min_low", "value": 0.91, "unit": "UEF", "source": "10 CFR 430.32, eCFR as of 2026-10-08 (d)(1), instantaneous electric under 2 gal", "source_url": "https://www.ecfr.gov/current/title-10/chapter-II/subchapter-D/part-430/subpart-C/section-430.32", "checked_on": "2026-10-14", "status": "verified", "note": "" }, { "key": "tankless.electric_uef_min_medium", "value": 0.91, "unit": "UEF", "source": "10 CFR 430.32, eCFR as of 2026-10-08 (d)(1), instantaneous electric under 2 gal", "source_url": "https://www.ecfr.gov/current/title-10/chapter-II/subchapter-D/part-430/subpart-C/section-430.32", "checked_on": "2026-10-14", "status": "verified", "note": "" }, { "key": "tankless.electric_uef_min_high", "value": 0.92, "unit": "UEF", "source": "10 CFR 430.32, eCFR as of 2026-10-08 (d)(1), instantaneous electric under 2 gal", "source_url": "https://www.ecfr.gov/current/title-10/chapter-II/subchapter-D/part-430/subpart-C/section-430.32", "checked_on": "2026-10-14", "status": "verified", "note": "" }, { "key": "tankless.resistance_uef_ceiling", "value": 1.0, "unit": "UEF", "source": "10 CFR 430 Subpart B Appendix E, section 6.4.4: UEF is the heat delivered in the water divided by the energy used", "source_url": "https://www.ecfr.gov/current/title-10/chapter-II/subchapter-D/part-430/subpart-B/appendix-Appendix%20E%20to%20Subpart%20B%20of%20Part%20430", "checked_on": "2026-10-14", "status": "verified", "note": "An electric resistance heater cannot deliver more heat than the electricity it uses, so 1.00 is the most any electric tankless heater can reach. A bound, not a rating." }, { "key": "tankless.supply_temperature_f", "value": 58.0, "unit": "°F", "source": "10 CFR 430 Subpart B Appendix E, section 2.3 (supply water 58 °F ± 2 °F)", "source_url": "https://www.ecfr.gov/current/title-10/chapter-II/subchapter-D/part-430/subpart-B/appendix-Appendix%20E%20to%20Subpart%20B%20of%20Part%20430", "checked_on": "2026-10-14", "status": "verified", "note": "The maximum flow a tankless heater is rated at is measured with this supply water." }, { "key": "tankless.outlet_temperature_f", "value": 125.0, "unit": "°F", "source": "10 CFR 430 Subpart B Appendix E, sections 2.4 and 2.5 (delivery 125 °F ± 5 °F)", "source_url": "https://www.ecfr.gov/current/title-10/chapter-II/subchapter-D/part-430/subpart-B/appendix-Appendix%20E%20to%20Subpart%20B%20of%20Part%20430", "checked_on": "2026-10-14", "status": "verified", "note": "" }, { "key": "tankless.showerhead_max_gpm", "value": 2.5, "unit": "gal/min", "source": "10 CFR 430.32, eCFR as of 2026-10-08 (p): the most a showerhead made after 1994-01-01 may use, at 80 psi", "source_url": "https://www.ecfr.gov/current/title-10/chapter-II/subchapter-D/part-430/subpart-C/section-430.32", "checked_on": "2026-10-14", "status": "verified", "note": "Used as the flow of one shower, counted as all hot water: the demanding case." }, { "key": "tankless.electric_tankless_max_kw", "value": 12.0, "unit": "kW", "source": "10 CFR 430.2, eCFR as of 2026-10-08: an electric instantaneous water heater \"has a nameplate input rating of 12 kW or less\"", "source_url": "https://www.ecfr.gov/current/title-10/chapter-II/subchapter-D/part-430/subpart-A/section-430.2", "checked_on": "2026-10-14", "status": "verified", "note": "Larger electric tankless units are outside the federal consumer class and its efficiency standard." }, { "key": "tankless.gas_tankless_max_input_btuh", "value": 200000.0, "unit": "Btu/h", "source": "10 CFR 430.2, eCFR as of 2026-10-08: a gas-fired instantaneous water heater \"has a nameplate input rating less than 200,000 Btu/h\"", "source_url": "https://www.ecfr.gov/current/title-10/chapter-II/subchapter-D/part-430/subpart-A/section-430.2", "checked_on": "2026-10-14", "status": "verified", "note": "Certified rows above it are data errors and are left out of the input median." }, { "key": "tankless.gas_storage_max_input_btuh", "value": 75000.0, "unit": "Btu/h", "source": "10 CFR 430.2, eCFR as of 2026-10-08: a gas-fired storage water heater \"has a nameplate input rating of 75,000 Btu/h or less\"", "source_url": "https://www.ecfr.gov/current/title-10/chapter-II/subchapter-D/part-430/subpart-A/section-430.2", "checked_on": "2026-10-14", "status": "verified", "note": "Same use: the upper bound of the input median of the certified gas tanks." }, { "key": "tankless.gas_tankless_life_years", "value": 20.0, "unit": "years", "source": "89 FR 105241 (2024-12-26): \"The estimated average lifetime for a gas-fired instantaneous water heater is about 20 years, whereas gas-fired storage water heaters operate for about 14 to 15 years.\"", "source_url": "https://www.federalregister.gov/documents/2024/12/26/2024-30369/energy-conservation-program-energy-conservation-standards-for-consumer-gas-fired-instantaneous-water", "checked_on": "2026-10-14", "status": "verified", "note": "Cited, not computed: DOE's estimate in its analysis. The rule itself was later withdrawn (90 FR 21390); the estimate is not a standard." }, { "key": "tankless.gas_tank_life_years_low", "value": 14.0, "unit": "years", "source": "89 FR 105241: gas-fired storage water heaters \"operate for about 14 to 15 years\"", "source_url": "https://www.federalregister.gov/documents/2024/12/26/2024-30369/energy-conservation-program-energy-conservation-standards-for-consumer-gas-fired-instantaneous-water", "checked_on": "2026-10-14", "status": "verified", "note": "Cited, not computed." }, { "key": "tankless.gas_tank_life_years_high", "value": 15.0, "unit": "years", "source": "89 FR 105241: gas-fired storage water heaters \"operate for about 14 to 15 years\"", "source_url": "https://www.federalregister.gov/documents/2024/12/26/2024-30369/energy-conservation-program-energy-conservation-standards-for-consumer-gas-fired-instantaneous-water", "checked_on": "2026-10-14", "status": "verified", "note": "Cited, not computed." }, { "key": "tankless.shower_temperature_f", "value": 105.0, "unit": "°F", "source": "Model choice: a warm shower, mixed at the valve from 125 °F hot water and the incoming water", "source_url": "https://www.ecfr.gov/current/title-10/chapter-II/subchapter-D/part-430/subpart-B/appendix-Appendix%20E%20to%20Subpart%20B%20of%20Part%20430", "checked_on": "2026-10-14", "status": "assumed", "note": "No federal figure; the page states it as an assumption and keeps the all-hot (125 °F) case beside it." }, { "key": "tankless.supply_volts", "value": 240.0, "unit": "V", "source": "Model choice: the 240-volt supply of a US home that an electric water heater is wired to", "source_url": "https://www.ecfr.gov/current/title-10/chapter-II/subchapter-D/part-430/subpart-A/section-430.2", "checked_on": "2026-10-14", "status": "assumed", "note": "Amps = watts ÷ 240. At 208 V the current is 15% higher." }, { "key": "wh.electric_tank_uef_min_from_2029", "value": 2.3, "unit": "UEF", "source": "10 CFR 430.32, eCFR as of 2026-10-08 (d)(2), electric storage 20–55 gal made on or after 2029-05-06, small electric storage excluded", "source_url": "https://www.ecfr.gov/current/title-10/chapter-II/subchapter-D/part-430/subpart-C/section-430.32", "checked_on": "2026-10-13", "status": "verified", "note": "In the eCFR as of 2026-10-08; a rule can be amended before it applies." }, { "key": "wh.gas_tank_uef_min_intercept_medium_from_2029", "value": 0.7046, "unit": "UEF", "source": "10 CFR 430.32, eCFR as of 2026-10-08 (d)(2), gas-fired storage 20–55 gal made on or after 2029-05-06, medium use", "source_url": "https://www.ecfr.gov/current/title-10/chapter-II/subchapter-D/part-430/subpart-C/section-430.32", "checked_on": "2026-10-13", "status": "verified", "note": "Slope 0.0017 per gallon of effective volume." } ], "unverified": [ { "what": "wh.gas_tank_gallons", "status": "assumed", "note": "\"The basic model is the federal minimum\" is an assumption about what is on the shelf; DOE certification data (CCMS, read 2026-10-13) gives a median UEF of 0.60 for 474 gas tanks of 36–45 gallons at medium use, against the minimum 0.58." }, { "what": "wh.electric_tank_gallons", "status": "assumed", "note": "CCMS median UEF 0.93 for 325 electric tanks of 46–55 gallons at medium use, against the minimum 0.92." }, { "what": "tankless.shower_temperature_f", "status": "assumed", "note": "No federal figure; the page states it as an assumption and keeps the all-hot (125 °F) case beside it." }, { "what": "tankless.supply_volts", "status": "assumed", "note": "Amps = watts ÷ 240. At 208 V the current is 15% higher." }, { "what": "low and high use for the tanks", "status": "assumed", "note": "The federal minimum of another draw pattern applied to the same tank is a model, not a rating." }, { "what": "one tankless UEF at every level of use", "status": "assumed", "note": "An approximation: ENERGY STAR rates 458 of 460 gas tankless models at high use only." }, { "what": "propane heaters", "status": "assumed", "note": "Same efficiency as the natural gas machine." }, { "what": "life of the heaters", "status": "cited", "note": "DOE's estimate in 89 FR 105241, quoted, not computed." }, { "what": "flow at other incoming temperatures", "status": "computed", "note": "Scaled from the rated maximum flow by the temperature rise, at the same burner output; not a rating." } ], "not_included": { "prices": "Purchase and installation prices of heaters: no open dataset publishes them.", "tankless_electricity": "The electricity a gas tankless heater uses: not in ENERGY STAR or federal data.", "inlet_by_state": "Incoming water temperature by state: not sourced; every figure uses the federal test's 58 °F.", "maintenance": "Descaling and other upkeep costs: DOE counts them in its analysis, but the dollar figures are in a document that could not be read." }, "us": { "code": "US", "name": "United States", "slug": "united-states", "electricity_cents_per_kwh": 17.99, "gas_usd_per_therm": 1.5754, "gas_basis": "trailing_12_months", "gas_period_label": "12 months to Jul 2026", "gas_estimated_usd_per_therm": 1.1242, "eia_average": { "gas_usd_per_therm": 1.5754, "cost_per_month_usd": { "gas_tank": 25.07, "gas_tankless": 15.32, "gas_tankless_basic": 17.96, "electric_tank": 52.89, "electric_tankless_basic": 53.51, "electric_tankless_ceiling": 48.7, "heat_pump": 13.52 }, "cost_per_year_usd": { "gas_tank": 300.89, "gas_tankless": 183.79, "gas_tankless_basic": 215.56, "electric_tank": 634.69, "electric_tankless_basic": 642.15, "electric_tankless_ceiling": 584.35, "heat_pump": 162.27 }, "saving_per_year_usd": { "gas_tankless": 117.1, "gas_tankless_basic": 85.33, "electric_tankless_at_minimum": -7.46, "electric_tankless_at_most": 50.34 }, "years_per_1000_usd": 8.5, "saved_over_life_usd": 2340.0, "heat_pump_under_gas_tankless_per_year_usd": 21.52, "gas_price_basis": "eia_average" }, "estimated": { "gas_usd_per_therm": 1.1242, "cost_per_month_usd": { "gas_tank": 17.89, "gas_tankless": 10.93, "gas_tankless_basic": 12.82, "electric_tank": 52.89, "electric_tankless_basic": 53.51, "electric_tankless_ceiling": 48.7, "heat_pump": 13.52 }, "cost_per_year_usd": { "gas_tank": 214.71, "gas_tankless": 131.15, "gas_tankless_basic": 153.82, "electric_tank": 634.69, "electric_tankless_basic": 642.15, "electric_tankless_ceiling": 584.35, "heat_pump": 162.27 }, "saving_per_year_usd": { "gas_tankless": 83.56, "gas_tankless_basic": 60.89, "electric_tankless_at_minimum": -7.46, "electric_tankless_at_most": 50.34 }, "years_per_1000_usd": 12.0, "saved_over_life_usd": 1680.0, "heat_pump_under_gas_tankless_per_year_usd": -31.12, "gas_price_basis": "estimated_per_therm" }, "household": { "low": { "cost_per_year_usd": { "gas_tank": 164.85, "gas_tankless": 90.61, "gas_tankless_basic": 106.28 }, "saving_per_year_usd": { "gas_tankless": 74.24, "gas_tankless_basic": 58.57 }, "saving_pct": 45.0, "saving_basic_pct": 35.5, "years_per_1000_usd": 13.5 }, "medium": { "cost_per_year_usd": { "gas_tank": 214.71, "gas_tankless": 131.15, "gas_tankless_basic": 153.82 }, "saving_per_year_usd": { "gas_tankless": 83.56, "gas_tankless_basic": 60.89 }, "saving_pct": 38.9, "saving_basic_pct": 28.4, "years_per_1000_usd": 12.0 }, "high": { "cost_per_year_usd": { "gas_tank": 297.33, "gas_tankless": 200.31, "gas_tankless_basic": 234.92 }, "saving_per_year_usd": { "gas_tankless": 97.02, "gas_tankless_basic": 62.41 }, "saving_pct": 32.6, "saving_basic_pct": 21.0, "years_per_1000_usd": 10.3 } }, "propane": { "usd_per_gallon": 2.553, "period_start": "2025-10", "period_end": "2026-03", "cost_per_year_usd": { "propane_tank": 533.07, "propane_tankless": 325.76 }, "saving_per_year_usd": 207.31, "years_per_1000_usd": 4.8, "status": "assumed" } }, "states": { "AL": { "code": "AL", "name": "Alabama", "slug": "alabama", "electricity_cents_per_kwh": 16.44, "gas_usd_per_therm": 1.7851, "gas_basis": "trailing_12_months", "gas_period_label": "12 months to Jul 2026", "gas_estimated_usd_per_therm": 1.5207, "eia_average": { "gas_usd_per_therm": 1.7851, "cost_per_month_usd": { "gas_tank": 28.41, "gas_tankless": 17.35, "gas_tankless_basic": 20.35, "electric_tank": 48.33, "electric_tankless_basic": 48.9, "electric_tankless_ceiling": 44.5, "heat_pump": 12.36 }, "cost_per_year_usd": { "gas_tank": 340.94, "gas_tankless": 208.25, "gas_tankless_basic": 244.26, "electric_tank": 580.0, "electric_tankless_basic": 586.83, "electric_tankless_ceiling": 534.0, "heat_pump": 148.29 }, "saving_per_year_usd": { "gas_tankless": 132.69, "gas_tankless_basic": 96.68, "electric_tankless_at_minimum": -6.83, "electric_tankless_at_most": 46.0 }, "years_per_1000_usd": 7.5, "saved_over_life_usd": 2660.0, "heat_pump_under_gas_tankless_per_year_usd": 59.96, "gas_price_basis": "eia_average" }, "estimated": { "gas_usd_per_therm": 1.5207, "cost_per_month_usd": { "gas_tank": 24.2, "gas_tankless": 14.78, "gas_tankless_basic": 17.34, "electric_tank": 48.33, "electric_tankless_basic": 48.9, "electric_tankless_ceiling": 44.5, "heat_pump": 12.36 }, "cost_per_year_usd": { "gas_tank": 290.44, "gas_tankless": 177.4, "gas_tankless_basic": 208.08, "electric_tank": 580.0, "electric_tankless_basic": 586.83, "electric_tankless_ceiling": 534.0, "heat_pump": 148.29 }, "saving_per_year_usd": { "gas_tankless": 113.04, "gas_tankless_basic": 82.36, "electric_tankless_at_minimum": -6.83, "electric_tankless_at_most": 46.0 }, "years_per_1000_usd": 8.8, "saved_over_life_usd": 2260.0, "heat_pump_under_gas_tankless_per_year_usd": 29.11, "gas_price_basis": "estimated_per_therm" }, "household": { "low": { "cost_per_year_usd": { "gas_tank": 223.0, "gas_tankless": 122.57, "gas_tankless_basic": 143.77 }, "saving_per_year_usd": { "gas_tankless": 100.43, "gas_tankless_basic": 79.23 }, "saving_pct": 45.0, "saving_basic_pct": 35.5, "years_per_1000_usd": 10.0 }, "medium": { "cost_per_year_usd": { "gas_tank": 290.44, "gas_tankless": 177.4, "gas_tankless_basic": 208.08 }, "saving_per_year_usd": { "gas_tankless": 113.04, "gas_tankless_basic": 82.36 }, "saving_pct": 38.9, "saving_basic_pct": 28.4, "years_per_1000_usd": 8.8 }, "high": { "cost_per_year_usd": { "gas_tank": 402.19, "gas_tankless": 270.96, "gas_tankless_basic": 317.78 }, "saving_per_year_usd": { "gas_tankless": 131.23, "gas_tankless_basic": 84.41 }, "saving_pct": 32.6, "saving_basic_pct": 21.0, "years_per_1000_usd": 7.6 } }, "propane": { "usd_per_gallon": 3.462, "period_start": "2025-10", "period_end": "2026-03", "cost_per_year_usd": { "propane_tank": 722.87, "propane_tankless": 441.75 }, "saving_per_year_usd": 281.12, "years_per_1000_usd": 3.6, "status": "assumed" } }, "AK": { "code": "AK", "name": "Alaska", "slug": "alaska", "electricity_cents_per_kwh": 26.85, "gas_usd_per_therm": 1.3759, "gas_basis": "trailing_12_months", "gas_period_label": "12 months to Jul 2026", "gas_estimated_usd_per_therm": 1.0753, "eia_average": { "gas_usd_per_therm": 1.3759, "cost_per_month_usd": { "gas_tank": 21.9, "gas_tankless": 13.38, "gas_tankless_basic": 15.69, "electric_tank": 78.94, "electric_tankless_basic": 79.87, "electric_tankless_ceiling": 72.68, "heat_pump": 20.18 }, "cost_per_year_usd": { "gas_tank": 262.78, "gas_tankless": 160.51, "gas_tankless_basic": 188.26, "electric_tank": 947.27, "electric_tankless_basic": 958.41, "electric_tankless_ceiling": 872.14, "heat_pump": 242.19 }, "saving_per_year_usd": { "gas_tankless": 102.27, "gas_tankless_basic": 74.52, "electric_tankless_at_minimum": -11.14, "electric_tankless_at_most": 75.13 }, "years_per_1000_usd": 9.8, "saved_over_life_usd": 2040.0, 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14.12 }, "cost_per_year_usd": { "gas_tank": 216.96, "gas_tankless": 132.53, "gas_tankless_basic": 155.44, "electric_tank": 662.91, "electric_tankless_basic": 670.71, "electric_tankless_ceiling": 610.34, "heat_pump": 169.49 }, "saving_per_year_usd": { "gas_tankless": 84.43, "gas_tankless_basic": 61.52, "electric_tankless_at_minimum": -7.8, "electric_tankless_at_most": 52.57 }, "years_per_1000_usd": 11.8, "saved_over_life_usd": 1680.0, "heat_pump_under_gas_tankless_per_year_usd": -36.96, "gas_price_basis": "eia_average" }, "estimated": { "gas_usd_per_therm": 0.7849, "cost_per_month_usd": { "gas_tank": 12.49, "gas_tankless": 7.63, "gas_tankless_basic": 8.95, "electric_tank": 55.24, "electric_tankless_basic": 55.89, "electric_tankless_ceiling": 50.86, "heat_pump": 14.12 }, "cost_per_year_usd": { "gas_tank": 149.91, "gas_tankless": 91.57, "gas_tankless_basic": 107.4, "electric_tank": 662.91, "electric_tankless_basic": 670.71, "electric_tankless_ceiling": 610.34, "heat_pump": 169.49 }, 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67.74, "gas_tankless_basic": 43.57 }, "saving_pct": 32.6, "saving_basic_pct": 21.0, "years_per_1000_usd": 14.8 } }, "propane": { "usd_per_gallon": 1.905, "period_start": "2025-10", "period_end": "2026-03", "cost_per_year_usd": { "propane_tank": 397.76, "propane_tankless": 243.08 }, "saving_per_year_usd": 154.68, "years_per_1000_usd": 6.5, "status": "assumed" } }, "IN": { "code": "IN", "name": "Indiana", "slug": "indiana", "electricity_cents_per_kwh": 16.94, "gas_usd_per_therm": 1.1543, "gas_basis": "trailing_12_months", "gas_period_label": "12 months to Jul 2026", "gas_estimated_usd_per_therm": 0.7356, "eia_average": { "gas_usd_per_therm": 1.1543, "cost_per_month_usd": { "gas_tank": 18.37, "gas_tankless": 11.22, "gas_tankless_basic": 13.16, "electric_tank": 49.8, "electric_tankless_basic": 50.39, "electric_tankless_ceiling": 45.85, "heat_pump": 12.73 }, "cost_per_year_usd": { "gas_tank": 220.46, "gas_tankless": 134.66, "gas_tankless_basic": 157.94, "electric_tank": 597.64, "electric_tankless_basic": 604.67, "electric_tankless_ceiling": 550.25, "heat_pump": 152.8 }, "saving_per_year_usd": { "gas_tankless": 85.8, "gas_tankless_basic": 62.52, "electric_tankless_at_minimum": -7.03, "electric_tankless_at_most": 47.39 }, "years_per_1000_usd": 11.7, "saved_over_life_usd": 1720.0, "heat_pump_under_gas_tankless_per_year_usd": -18.14, "gas_price_basis": "eia_average" }, "estimated": { "gas_usd_per_therm": 0.7356, "cost_per_month_usd": { "gas_tank": 11.71, "gas_tankless": 7.15, "gas_tankless_basic": 8.39, "electric_tank": 49.8, "electric_tankless_basic": 50.39, "electric_tankless_ceiling": 45.85, "heat_pump": 12.73 }, "cost_per_year_usd": { "gas_tank": 140.49, "gas_tankless": 85.82, "gas_tankless_basic": 100.65, "electric_tank": 597.64, "electric_tankless_basic": 604.67, "electric_tankless_ceiling": 550.25, "heat_pump": 152.8 }, "saving_per_year_usd": { "gas_tankless": 54.67, "gas_tankless_basic": 39.84, "electric_tankless_at_minimum": -7.03, "electric_tankless_at_most": 47.39 }, "years_per_1000_usd": 18.3, "saved_over_life_usd": 1100.0, "heat_pump_under_gas_tankless_per_year_usd": -66.98, "gas_price_basis": "estimated_per_therm" }, "household": { "low": { "cost_per_year_usd": { "gas_tank": 107.87, "gas_tankless": 59.29, "gas_tankless_basic": 69.54 }, "saving_per_year_usd": { "gas_tankless": 48.58, "gas_tankless_basic": 38.33 }, "saving_pct": 45.0, "saving_basic_pct": 35.5, "years_per_1000_usd": 20.6 }, "medium": { "cost_per_year_usd": { "gas_tank": 140.49, "gas_tankless": 85.82, "gas_tankless_basic": 100.65 }, "saving_per_year_usd": { "gas_tankless": 54.67, "gas_tankless_basic": 39.84 }, "saving_pct": 38.9, "saving_basic_pct": 28.4, "years_per_1000_usd": 18.3 }, "high": { "cost_per_year_usd": { "gas_tank": 194.55, "gas_tankless": 131.07, "gas_tankless_basic": 153.72 }, "saving_per_year_usd": { "gas_tankless": 63.48, "gas_tankless_basic": 40.83 }, "saving_pct": 32.6, "saving_basic_pct": 21.0, "years_per_1000_usd": 15.8 } }, 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9.4, "saved_over_life_usd": 2120.0, "heat_pump_under_gas_tankless_per_year_usd": 30.18, "gas_price_basis": "eia_average" }, "estimated": { "gas_usd_per_therm": 0.8762, "cost_per_month_usd": { "gas_tank": 13.95, "gas_tankless": 8.52, "gas_tankless_basic": 9.99, "electric_tank": 44.36, "electric_tankless_basic": 44.89, "electric_tankless_ceiling": 40.85, "heat_pump": 11.34 }, "cost_per_year_usd": { "gas_tank": 167.35, "gas_tankless": 102.22, "gas_tankless_basic": 119.89, "electric_tank": 532.38, "electric_tankless_basic": 538.64, "electric_tankless_ceiling": 490.15, "heat_pump": 136.11 }, "saving_per_year_usd": { "gas_tankless": 65.13, "gas_tankless_basic": 47.46, "electric_tankless_at_minimum": -6.26, "electric_tankless_at_most": 42.23 }, "years_per_1000_usd": 15.4, "saved_over_life_usd": 1300.0, "heat_pump_under_gas_tankless_per_year_usd": -33.89, "gas_price_basis": "estimated_per_therm" }, "household": { "low": { "cost_per_year_usd": { "gas_tank": 128.49, "gas_tankless": 70.62, "gas_tankless_basic": 82.84 }, "saving_per_year_usd": { "gas_tankless": 57.87, "gas_tankless_basic": 45.65 }, "saving_pct": 45.0, "saving_basic_pct": 35.5, "years_per_1000_usd": 17.3 }, "medium": { "cost_per_year_usd": { "gas_tank": 167.35, "gas_tankless": 102.22, "gas_tankless_basic": 119.89 }, "saving_per_year_usd": { "gas_tankless": 65.13, "gas_tankless_basic": 47.46 }, "saving_pct": 38.9, "saving_basic_pct": 28.4, "years_per_1000_usd": 15.4 }, "high": { "cost_per_year_usd": { "gas_tank": 231.74, "gas_tankless": 156.12, "gas_tankless_basic": 183.1 }, "saving_per_year_usd": { "gas_tankless": 75.62, "gas_tankless_basic": 48.64 }, "saving_pct": 32.6, "saving_basic_pct": 21.0, "years_per_1000_usd": 13.2 } }, "propane": { "usd_per_gallon": 1.899, "period_start": "2025-10", "period_end": "2026-03", "cost_per_year_usd": { "propane_tank": 396.51, "propane_tankless": 242.31 }, "saving_per_year_usd": 154.2, "years_per_1000_usd": 6.5, "status": "assumed" } }, "KY": { "code": "KY", "name": 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347.01, "gas_tankless": 211.96, "gas_tankless_basic": 248.61, "electric_tank": 1034.06, "electric_tankless_basic": 1046.22, "electric_tankless_ceiling": 952.05, "heat_pump": 264.38 }, "saving_per_year_usd": { "gas_tankless": 135.05, "gas_tankless_basic": 98.4, "electric_tankless_at_minimum": -12.16, "electric_tankless_at_most": 82.01 }, "years_per_1000_usd": 7.4, "saved_over_life_usd": 2700.0, "heat_pump_under_gas_tankless_per_year_usd": -52.42, "gas_price_basis": "eia_average" }, "estimated": { "gas_usd_per_therm": 1.3663, "cost_per_month_usd": { "gas_tank": 21.75, "gas_tankless": 13.28, "gas_tankless_basic": 15.58, "electric_tank": 86.17, "electric_tankless_basic": 87.19, "electric_tankless_ceiling": 79.34, "heat_pump": 22.03 }, "cost_per_year_usd": { "gas_tank": 260.95, "gas_tankless": 159.39, "gas_tankless_basic": 186.95, "electric_tank": 1034.06, "electric_tankless_basic": 1046.22, "electric_tankless_ceiling": 952.05, "heat_pump": 264.38 }, "saving_per_year_usd": { "gas_tankless": 101.56, "gas_tankless_basic": 74.0, "electric_tankless_at_minimum": -12.16, "electric_tankless_at_most": 82.01 }, "years_per_1000_usd": 9.8, "saved_over_life_usd": 2040.0, "heat_pump_under_gas_tankless_per_year_usd": -104.99, "gas_price_basis": "estimated_per_therm" }, "household": { "low": { "cost_per_year_usd": { "gas_tank": 200.35, "gas_tankless": 110.12, "gas_tankless_basic": 129.17 }, "saving_per_year_usd": { "gas_tankless": 90.23, "gas_tankless_basic": 71.18 }, "saving_pct": 45.0, "saving_basic_pct": 35.5, "years_per_1000_usd": 11.1 }, "medium": { "cost_per_year_usd": { "gas_tank": 260.95, "gas_tankless": 159.39, "gas_tankless_basic": 186.95 }, "saving_per_year_usd": { "gas_tankless": 101.56, "gas_tankless_basic": 74.0 }, "saving_pct": 38.9, "saving_basic_pct": 28.4, "years_per_1000_usd": 9.8 }, "high": { "cost_per_year_usd": { "gas_tank": 361.36, "gas_tankless": 243.45, "gas_tankless_basic": 285.52 }, "saving_per_year_usd": { "gas_tankless": 117.91, "gas_tankless_basic": 75.84 }, "saving_pct": 32.6, "saving_basic_pct": 21.0, "years_per_1000_usd": 8.5 } }, "propane": { "usd_per_gallon": 3.294, "period_start": "2025-10", "period_end": "2026-03", "cost_per_year_usd": { "propane_tank": 687.79, "propane_tankless": 420.31 }, "saving_per_year_usd": 267.48, "years_per_1000_usd": 3.7, "status": "assumed" } }, "MD": { "code": "MD", "name": "Maryland", "slug": "maryland", "electricity_cents_per_kwh": 21.03, "gas_usd_per_therm": 1.5549, "gas_basis": "calendar_year", "gas_period_label": "calendar year 2024", "gas_estimated_usd_per_therm": 1.3782, "eia_average": { "gas_usd_per_therm": 1.5549, "cost_per_month_usd": { "gas_tank": 24.75, "gas_tankless": 15.12, "gas_tankless_basic": 17.73, "electric_tank": 61.83, "electric_tankless_basic": 62.56, "electric_tankless_ceiling": 56.92, "heat_pump": 15.81 }, "cost_per_year_usd": { "gas_tank": 296.97, "gas_tankless": 181.39, "gas_tankless_basic": 212.76, "electric_tank": 741.94, "electric_tankless_basic": 750.67, 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"period_start": "2025-10", "period_end": "2026-03", "cost_per_year_usd": { "propane_tank": 748.55, "propane_tankless": 457.45 }, "saving_per_year_usd": 291.1, "years_per_1000_usd": 3.4, "status": "assumed" } }, "MA": { "code": "MA", "name": "Massachusetts", "slug": "massachusetts", "electricity_cents_per_kwh": 30.43, "gas_usd_per_therm": 2.5505, "gas_basis": "trailing_12_months", "gas_period_label": "12 months to Jul 2026", "gas_estimated_usd_per_therm": null, "eia_average": { "gas_usd_per_therm": 2.5505, "cost_per_month_usd": { "gas_tank": 40.59, "gas_tankless": 24.8, "gas_tankless_basic": 29.08, "electric_tank": 89.46, "electric_tankless_basic": 90.52, "electric_tankless_ceiling": 82.37, "heat_pump": 22.87 }, "cost_per_year_usd": { "gas_tank": 487.12, "gas_tankless": 297.54, "gas_tankless_basic": 348.98, "electric_tank": 1073.57, "electric_tankless_basic": 1086.2, "electric_tankless_ceiling": 988.43, "heat_pump": 274.48 }, "saving_per_year_usd": { "gas_tankless": 189.58, "gas_tankless_basic": 138.14, "electric_tankless_at_minimum": -12.63, "electric_tankless_at_most": 85.14 }, "years_per_1000_usd": 5.3, "saved_over_life_usd": 3800.0, "heat_pump_under_gas_tankless_per_year_usd": 23.06, "gas_price_basis": "eia_average" }, "estimated": { "gas_usd_per_therm": 2.5505, "cost_per_month_usd": { "gas_tank": 40.59, "gas_tankless": 24.8, "gas_tankless_basic": 29.08, "electric_tank": 89.46, "electric_tankless_basic": 90.52, "electric_tankless_ceiling": 82.37, "heat_pump": 22.87 }, "cost_per_year_usd": { "gas_tank": 487.12, "gas_tankless": 297.54, "gas_tankless_basic": 348.98, "electric_tank": 1073.57, "electric_tankless_basic": 1086.2, "electric_tankless_ceiling": 988.43, "heat_pump": 274.48 }, "saving_per_year_usd": { "gas_tankless": 189.58, "gas_tankless_basic": 138.14, "electric_tankless_at_minimum": -12.63, "electric_tankless_at_most": 85.14 }, "years_per_1000_usd": 5.3, "saved_over_life_usd": 3800.0, "heat_pump_under_gas_tankless_per_year_usd": 23.06, 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"gas_tankless": 69.68, "gas_tankless_basic": 81.73 }, "saving_per_year_usd": { "gas_tankless": 57.09, "gas_tankless_basic": 45.04 }, "saving_pct": 45.0, "saving_basic_pct": 35.5, "years_per_1000_usd": 17.5 }, "medium": { "cost_per_year_usd": { "gas_tank": 165.11, "gas_tankless": 100.85, "gas_tankless_basic": 118.29 }, "saving_per_year_usd": { "gas_tankless": 64.26, "gas_tankless_basic": 46.82 }, "saving_pct": 38.9, "saving_basic_pct": 28.4, "years_per_1000_usd": 15.6 }, "high": { "cost_per_year_usd": { "gas_tank": 228.64, "gas_tankless": 154.04, "gas_tankless_basic": 180.65 }, "saving_per_year_usd": { "gas_tankless": 74.6, "gas_tankless_basic": 47.99 }, "saving_pct": 32.6, "saving_basic_pct": 21.0, "years_per_1000_usd": 13.4 } }, "propane": { "usd_per_gallon": 2.262, "period_start": "2025-10", "period_end": "2026-03", "cost_per_year_usd": { "propane_tank": 472.31, "propane_tankless": 288.63 }, "saving_per_year_usd": 183.68, "years_per_1000_usd": 5.4, "status": "assumed" } }, "MN": { 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"gas_tankless": 137.54, "gas_tankless_basic": 161.32 }, "saving_per_year_usd": { "gas_tankless": 87.64, "gas_tankless_basic": 63.86 }, "saving_pct": 38.9, "saving_basic_pct": 28.4, "years_per_1000_usd": 11.4 }, "high": { "cost_per_year_usd": { "gas_tank": 311.82, "gas_tankless": 210.07, "gas_tankless_basic": 246.38 }, "saving_per_year_usd": { "gas_tankless": 101.75, "gas_tankless_basic": 65.44 }, "saving_pct": 32.6, "saving_basic_pct": 21.0, "years_per_1000_usd": 9.8 } }, "propane": { "usd_per_gallon": 3.02, "period_start": "2025-10", "period_end": "2026-03", "cost_per_year_usd": { "propane_tank": 630.58, "propane_tankless": 385.35 }, "saving_per_year_usd": 245.23, "years_per_1000_usd": 4.1, "status": "assumed" } }, "MO": { "code": "MO", "name": "Missouri", "slug": "missouri", "electricity_cents_per_kwh": 13.95, "gas_usd_per_therm": 1.6611, "gas_basis": "trailing_12_months", "gas_period_label": "12 months to Jul 2026", "gas_estimated_usd_per_therm": 1.2335, "eia_average": { 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"heat_pump": 10.49 }, "cost_per_year_usd": { "gas_tank": 235.59, "gas_tankless": 143.9, "gas_tankless_basic": 168.78, "electric_tank": 492.16, "electric_tankless_basic": 497.95, "electric_tankless_ceiling": 453.12, "heat_pump": 125.83 }, "saving_per_year_usd": { "gas_tankless": 91.69, "gas_tankless_basic": 66.81, "electric_tankless_at_minimum": -5.79, "electric_tankless_at_most": 39.04 }, "years_per_1000_usd": 10.9, "saved_over_life_usd": 1840.0, "heat_pump_under_gas_tankless_per_year_usd": 18.07, "gas_price_basis": "estimated_per_therm" }, "household": { "low": { "cost_per_year_usd": { "gas_tank": 180.88, "gas_tankless": 99.42, "gas_tankless_basic": 116.62 }, "saving_per_year_usd": { "gas_tankless": 81.46, "gas_tankless_basic": 64.26 }, "saving_pct": 45.0, "saving_basic_pct": 35.5, "years_per_1000_usd": 12.3 }, "medium": { "cost_per_year_usd": { "gas_tank": 235.59, "gas_tankless": 143.9, "gas_tankless_basic": 168.78 }, "saving_per_year_usd": { "gas_tankless": 91.69, "gas_tankless_basic": 66.81 }, "saving_pct": 38.9, "saving_basic_pct": 28.4, "years_per_1000_usd": 10.9 }, "high": { "cost_per_year_usd": { "gas_tank": 326.24, "gas_tankless": 219.79, "gas_tankless_basic": 257.76 }, "saving_per_year_usd": { "gas_tankless": 106.45, "gas_tankless_basic": 68.48 }, "saving_pct": 32.6, "saving_basic_pct": 21.0, "years_per_1000_usd": 9.4 } }, "propane": { "usd_per_gallon": 2.097, "period_start": "2025-10", "period_end": "2026-03", "cost_per_year_usd": { "propane_tank": 437.85, "propane_tankless": 267.58 }, "saving_per_year_usd": 170.27, "years_per_1000_usd": 5.9, "status": "assumed" } }, "MT": { "code": "MT", "name": "Montana", "slug": "montana", "electricity_cents_per_kwh": 13.84, "gas_usd_per_therm": 0.8686, "gas_basis": "trailing_12_months", "gas_period_label": "12 months to Jul 2026", "gas_estimated_usd_per_therm": 0.694, "eia_average": { "gas_usd_per_therm": 0.8686, "cost_per_month_usd": { "gas_tank": 13.82, "gas_tankless": 8.44, "gas_tankless_basic": 9.9, "electric_tank": 40.69, "electric_tankless_basic": 41.17, "electric_tankless_ceiling": 37.46, "heat_pump": 10.4 }, "cost_per_year_usd": { "gas_tank": 165.89, "gas_tankless": 101.33, "gas_tankless_basic": 118.85, "electric_tank": 488.28, "electric_tankless_basic": 494.02, "electric_tankless_ceiling": 449.55, "heat_pump": 124.84 }, "saving_per_year_usd": { "gas_tankless": 64.56, "gas_tankless_basic": 47.04, "electric_tankless_at_minimum": -5.74, "electric_tankless_at_most": 38.73 }, "years_per_1000_usd": 15.5, "saved_over_life_usd": 1300.0, "heat_pump_under_gas_tankless_per_year_usd": -23.51, "gas_price_basis": "eia_average" }, "estimated": { "gas_usd_per_therm": 0.694, "cost_per_month_usd": { "gas_tank": 11.05, "gas_tankless": 6.75, "gas_tankless_basic": 7.91, "electric_tank": 40.69, "electric_tankless_basic": 41.17, "electric_tankless_ceiling": 37.46, "heat_pump": 10.4 }, "cost_per_year_usd": { "gas_tank": 132.55, "gas_tankless": 80.96, "gas_tankless_basic": 94.96, 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"cost_per_year_usd": { "gas_tank": 234.17, "gas_tankless": 143.04, "gas_tankless_basic": 167.77, "electric_tank": 453.7, "electric_tankless_basic": 459.04, "electric_tankless_ceiling": 417.72, "heat_pump": 116.0 }, "saving_per_year_usd": { "gas_tankless": 91.13, "gas_tankless_basic": 66.4, "electric_tankless_at_minimum": -5.34, "electric_tankless_at_most": 35.98 }, "years_per_1000_usd": 11.0, "saved_over_life_usd": 1820.0, "heat_pump_under_gas_tankless_per_year_usd": 27.04, "gas_price_basis": "eia_average" }, "estimated": { "gas_usd_per_therm": 0.7582, "cost_per_month_usd": { "gas_tank": 12.07, "gas_tankless": 7.37, "gas_tankless_basic": 8.65, "electric_tank": 37.81, "electric_tankless_basic": 38.25, "electric_tankless_ceiling": 34.81, "heat_pump": 9.67 }, "cost_per_year_usd": { "gas_tank": 144.81, "gas_tankless": 88.45, "gas_tankless_basic": 103.74, "electric_tank": 453.7, "electric_tankless_basic": 459.04, "electric_tankless_ceiling": 417.72, "heat_pump": 116.0 }, 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65.43, "gas_tankless_basic": 42.09 }, "saving_pct": 32.6, "saving_basic_pct": 21.0, "years_per_1000_usd": 15.3 } }, "propane": { "usd_per_gallon": 1.606, "period_start": "2025-10", "period_end": "2026-03", "cost_per_year_usd": { "propane_tank": 335.33, "propane_tankless": 204.93 }, "saving_per_year_usd": 130.4, "years_per_1000_usd": 7.7, "status": "assumed" } }, "NV": { "code": "NV", "name": "Nevada", "slug": "nevada", "electricity_cents_per_kwh": 13.36, "gas_usd_per_therm": 1.0807, "gas_basis": "trailing_12_months", "gas_period_label": "12 months to Jul 2026", "gas_estimated_usd_per_therm": null, "eia_average": { "gas_usd_per_therm": 1.0807, "cost_per_month_usd": { "gas_tank": 17.2, "gas_tankless": 10.51, "gas_tankless_basic": 12.32, "electric_tank": 39.28, "electric_tankless_basic": 39.74, "electric_tankless_ceiling": 36.16, "heat_pump": 10.04 }, "cost_per_year_usd": { "gas_tank": 206.4, "gas_tankless": 126.07, "gas_tankless_basic": 147.87, "electric_tank": 471.34, "electric_tankless_basic": 476.89, "electric_tankless_ceiling": 433.96, "heat_pump": 120.51 }, "saving_per_year_usd": { "gas_tankless": 80.33, "gas_tankless_basic": 58.53, "electric_tankless_at_minimum": -5.55, "electric_tankless_at_most": 37.38 }, "years_per_1000_usd": 12.4, "saved_over_life_usd": 1600.0, "heat_pump_under_gas_tankless_per_year_usd": 5.56, "gas_price_basis": "eia_average" }, "estimated": { "gas_usd_per_therm": 1.0807, "cost_per_month_usd": { "gas_tank": 17.2, "gas_tankless": 10.51, "gas_tankless_basic": 12.32, "electric_tank": 39.28, "electric_tankless_basic": 39.74, "electric_tankless_ceiling": 36.16, "heat_pump": 10.04 }, "cost_per_year_usd": { "gas_tank": 206.4, "gas_tankless": 126.07, "gas_tankless_basic": 147.87, "electric_tank": 471.34, "electric_tankless_basic": 476.89, "electric_tankless_ceiling": 433.96, "heat_pump": 120.51 }, "saving_per_year_usd": { "gas_tankless": 80.33, "gas_tankless_basic": 58.53, "electric_tankless_at_minimum": -5.55, "electric_tankless_at_most": 37.38 }, "years_per_1000_usd": 12.4, "saved_over_life_usd": 1600.0, "heat_pump_under_gas_tankless_per_year_usd": 5.56, "gas_price_basis": "eia_average_fallback" }, "household": { "low": { "cost_per_year_usd": { "gas_tank": 158.47, "gas_tankless": 87.1, "gas_tankless_basic": 102.17 }, "saving_per_year_usd": { "gas_tankless": 71.37, "gas_tankless_basic": 56.3 }, "saving_pct": 45.0, "saving_basic_pct": 35.5, "years_per_1000_usd": 14.0 }, "medium": { "cost_per_year_usd": { "gas_tank": 206.4, "gas_tankless": 126.07, "gas_tankless_basic": 147.87 }, "saving_per_year_usd": { "gas_tankless": 80.33, "gas_tankless_basic": 58.53 }, "saving_pct": 38.9, "saving_basic_pct": 28.4, "years_per_1000_usd": 12.4 }, "high": { "cost_per_year_usd": { "gas_tank": 285.82, "gas_tankless": 192.56, "gas_tankless_basic": 225.83 }, "saving_per_year_usd": { "gas_tankless": 93.26, "gas_tankless_basic": 59.99 }, "saving_pct": 32.6, "saving_basic_pct": 21.0, "years_per_1000_usd": 10.7 } }, 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19.37, "gas_tankless": 11.83, "gas_tankless_basic": 13.88, "electric_tank": 69.91, "electric_tankless_basic": 70.74, "electric_tankless_ceiling": 64.37, "heat_pump": 17.87 }, "cost_per_year_usd": { "gas_tank": 232.43, "gas_tankless": 141.98, "gas_tankless_basic": 166.52, "electric_tank": 838.96, "electric_tankless_basic": 848.83, "electric_tankless_ceiling": 772.42, "heat_pump": 214.5 }, "saving_per_year_usd": { "gas_tankless": 90.45, "gas_tankless_basic": 65.91, "electric_tankless_at_minimum": -9.87, "electric_tankless_at_most": 66.54 }, "years_per_1000_usd": 11.1, "saved_over_life_usd": 1800.0, "heat_pump_under_gas_tankless_per_year_usd": -72.52, "gas_price_basis": "estimated_per_therm" }, "household": { "low": { "cost_per_year_usd": { "gas_tank": 178.46, "gas_tankless": 98.09, "gas_tankless_basic": 115.06 }, "saving_per_year_usd": { "gas_tankless": 80.37, "gas_tankless_basic": 63.4 }, "saving_pct": 45.0, "saving_basic_pct": 35.5, "years_per_1000_usd": 12.4 }, "medium": { "cost_per_year_usd": { "gas_tank": 232.43, "gas_tankless": 141.98, "gas_tankless_basic": 166.52 }, "saving_per_year_usd": { "gas_tankless": 90.45, "gas_tankless_basic": 65.91 }, "saving_pct": 38.9, "saving_basic_pct": 28.4, "years_per_1000_usd": 11.1 }, "high": { "cost_per_year_usd": { "gas_tank": 321.87, "gas_tankless": 216.85, "gas_tankless_basic": 254.32 }, "saving_per_year_usd": { "gas_tankless": 105.02, "gas_tankless_basic": 67.55 }, "saving_pct": 32.6, "saving_basic_pct": 21.0, "years_per_1000_usd": 9.5 } }, "propane": { "usd_per_gallon": 3.628, "period_start": "2025-10", "period_end": "2026-03", "cost_per_year_usd": { "propane_tank": 757.53, "propane_tankless": 462.93 }, "saving_per_year_usd": 294.6, "years_per_1000_usd": 3.4, "status": "assumed" } }, "NM": { "code": "NM", "name": "New Mexico", "slug": "new-mexico", "electricity_cents_per_kwh": 15.24, "gas_usd_per_therm": 0.9637, "gas_basis": "calendar_year", "gas_period_label": "calendar year 2025", 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45.33, "electric_tankless_ceiling": 41.25, "heat_pump": 11.46 }, "cost_per_year_usd": { "gas_tank": 184.06, "gas_tankless": 112.43, "gas_tankless_basic": 131.86, "electric_tank": 537.67, "electric_tankless_basic": 543.99, "electric_tankless_ceiling": 495.03, "heat_pump": 137.46 }, "saving_per_year_usd": { "gas_tankless": 71.63, "gas_tankless_basic": 52.2, "electric_tankless_at_minimum": -6.32, "electric_tankless_at_most": 42.64 }, "years_per_1000_usd": 14.0, "saved_over_life_usd": 1440.0, "heat_pump_under_gas_tankless_per_year_usd": -25.03, "gas_price_basis": "eia_average_fallback" }, "household": { "low": { "cost_per_year_usd": { "gas_tank": 141.32, "gas_tankless": 77.67, "gas_tankless_basic": 91.11 }, "saving_per_year_usd": { "gas_tankless": 63.65, "gas_tankless_basic": 50.21 }, "saving_pct": 45.0, "saving_basic_pct": 35.5, "years_per_1000_usd": 15.7 }, "medium": { "cost_per_year_usd": { "gas_tank": 184.06, "gas_tankless": 112.43, "gas_tankless_basic": 131.86 }, 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211.6, "gas_tankless_basic": 248.18, "electric_tank": 1001.6, "electric_tankless_basic": 1013.38, "electric_tankless_ceiling": 922.16, "heat_pump": 256.08 }, "saving_per_year_usd": { "gas_tankless": 134.82, "gas_tankless_basic": 98.24, "electric_tankless_at_minimum": -11.78, "electric_tankless_at_most": 79.44 }, "years_per_1000_usd": 7.4, "saved_over_life_usd": 2700.0, "heat_pump_under_gas_tankless_per_year_usd": -44.48, "gas_price_basis": "eia_average" }, "estimated": { "gas_usd_per_therm": 1.4226, "cost_per_month_usd": { "gas_tank": 22.64, "gas_tankless": 13.83, "gas_tankless_basic": 16.22, "electric_tank": 83.47, "electric_tankless_basic": 84.45, "electric_tankless_ceiling": 76.85, "heat_pump": 21.34 }, "cost_per_year_usd": { "gas_tank": 271.7, "gas_tankless": 165.96, "gas_tankless_basic": 194.65, "electric_tank": 1001.6, "electric_tankless_basic": 1013.38, "electric_tankless_ceiling": 922.16, "heat_pump": 256.08 }, "saving_per_year_usd": { "gas_tankless": 105.74, 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"saving_pct": 32.6, "saving_basic_pct": 21.0, "years_per_1000_usd": 8.1 } }, "propane": { "usd_per_gallon": 3.528, "period_start": "2025-10", "period_end": "2026-03", "cost_per_year_usd": { "propane_tank": 736.65, "propane_tankless": 450.17 }, "saving_per_year_usd": 286.48, "years_per_1000_usd": 3.5, "status": "assumed" } }, "NC": { "code": "NC", "name": "North Carolina", "slug": "north-carolina", "electricity_cents_per_kwh": 14.77, "gas_usd_per_therm": 1.5819, "gas_basis": "calendar_year", "gas_period_label": "calendar year 2024", "gas_estimated_usd_per_therm": 1.5072, "eia_average": { "gas_usd_per_therm": 1.5819, "cost_per_month_usd": { "gas_tank": 25.18, "gas_tankless": 15.38, "gas_tankless_basic": 18.04, "electric_tank": 43.42, "electric_tankless_basic": 43.93, "electric_tankless_ceiling": 39.98, "heat_pump": 11.1 }, "cost_per_year_usd": { "gas_tank": 302.13, "gas_tankless": 184.54, "gas_tankless_basic": 216.45, "electric_tank": 521.09, "electric_tankless_basic": 527.22, "electric_tankless_ceiling": 479.76, "heat_pump": 133.23 }, "saving_per_year_usd": { "gas_tankless": 117.59, "gas_tankless_basic": 85.68, "electric_tankless_at_minimum": -6.13, "electric_tankless_at_most": 41.33 }, "years_per_1000_usd": 8.5, "saved_over_life_usd": 2360.0, "heat_pump_under_gas_tankless_per_year_usd": 51.31, "gas_price_basis": "eia_average" }, "estimated": { "gas_usd_per_therm": 1.5072, "cost_per_month_usd": { "gas_tank": 23.99, "gas_tankless": 14.65, "gas_tankless_basic": 17.19, "electric_tank": 43.42, "electric_tankless_basic": 43.93, "electric_tankless_ceiling": 39.98, "heat_pump": 11.1 }, "cost_per_year_usd": { "gas_tank": 287.86, "gas_tankless": 175.83, "gas_tankless_basic": 206.23, "electric_tank": 521.09, "electric_tankless_basic": 527.22, "electric_tankless_ceiling": 479.76, "heat_pump": 133.23 }, "saving_per_year_usd": { "gas_tankless": 112.03, "gas_tankless_basic": 81.63, "electric_tankless_at_minimum": -6.13, "electric_tankless_at_most": 41.33 }, 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"period_start": "2025-10", "period_end": "2026-03", "cost_per_year_usd": { "propane_tank": 701.15, "propane_tankless": 428.48 }, "saving_per_year_usd": 272.67, "years_per_1000_usd": 3.7, "status": "assumed" } }, "ND": { "code": "ND", "name": "North Dakota", "slug": "north-dakota", "electricity_cents_per_kwh": 12.32, "gas_usd_per_therm": 0.9692, "gas_basis": "trailing_12_months", "gas_period_label": "12 months to Jul 2026", "gas_estimated_usd_per_therm": 0.5128, "eia_average": { "gas_usd_per_therm": 0.9692, "cost_per_month_usd": { "gas_tank": 15.43, "gas_tankless": 9.42, "gas_tankless_basic": 11.05, "electric_tank": 36.22, "electric_tankless_basic": 36.65, "electric_tankless_ceiling": 33.35, "heat_pump": 9.26 }, "cost_per_year_usd": { "gas_tank": 185.11, "gas_tankless": 113.07, "gas_tankless_basic": 132.62, "electric_tank": 434.65, "electric_tankless_basic": 439.76, "electric_tankless_ceiling": 400.18, "heat_pump": 111.13 }, "saving_per_year_usd": { "gas_tankless": 72.04, 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"electric_tankless_basic": 46.11, "electric_tankless_ceiling": 41.96, "heat_pump": 11.65 }, "cost_per_year_usd": { "gas_tank": 254.38, "gas_tankless": 155.38, "gas_tankless_basic": 182.24, "electric_tank": 546.84, "electric_tankless_basic": 553.27, "electric_tankless_ceiling": 503.47, "heat_pump": 139.81 }, "saving_per_year_usd": { "gas_tankless": 99.0, "gas_tankless_basic": 72.14, "electric_tankless_at_minimum": -6.43, "electric_tankless_at_most": 43.37 }, "years_per_1000_usd": 10.1, "saved_over_life_usd": 1980.0, "heat_pump_under_gas_tankless_per_year_usd": 15.57, "gas_price_basis": "estimated_per_therm" }, "household": { "low": { "cost_per_year_usd": { "gas_tank": 195.31, "gas_tankless": 107.35, "gas_tankless_basic": 125.92 }, "saving_per_year_usd": { "gas_tankless": 87.96, "gas_tankless_basic": 69.39 }, "saving_pct": 45.0, "saving_basic_pct": 35.5, "years_per_1000_usd": 11.4 }, "medium": { "cost_per_year_usd": { "gas_tank": 254.38, "gas_tankless": 155.38, "gas_tankless_basic": 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294.11, "gas_tankless": 179.64, "gas_tankless_basic": 210.7, "electric_tank": 730.3, "electric_tankless_basic": 738.89, "electric_tankless_ceiling": 672.38, "heat_pump": 186.71 }, "saving_per_year_usd": { "gas_tankless": 114.47, "gas_tankless_basic": 83.41, "electric_tankless_at_minimum": -8.59, "electric_tankless_at_most": 57.92 }, "years_per_1000_usd": 8.7, "saved_over_life_usd": 2280.0, "heat_pump_under_gas_tankless_per_year_usd": -7.07, "gas_price_basis": "eia_average" }, "estimated": { "gas_usd_per_therm": 1.1625, "cost_per_month_usd": { "gas_tank": 18.5, "gas_tankless": 11.3, "gas_tankless_basic": 13.26, "electric_tank": 60.86, "electric_tankless_basic": 61.57, "electric_tankless_ceiling": 56.03, "heat_pump": 15.56 }, "cost_per_year_usd": { "gas_tank": 222.03, "gas_tankless": 135.62, "gas_tankless_basic": 159.06, "electric_tank": 730.3, "electric_tankless_basic": 738.89, "electric_tankless_ceiling": 672.38, "heat_pump": 186.71 }, "saving_per_year_usd": { "gas_tankless": 86.41, "gas_tankless_basic": 62.97, "electric_tankless_at_minimum": -8.59, "electric_tankless_at_most": 57.92 }, "years_per_1000_usd": 11.6, "saved_over_life_usd": 1720.0, "heat_pump_under_gas_tankless_per_year_usd": -51.09, "gas_price_basis": "estimated_per_therm" }, "household": { "low": { "cost_per_year_usd": { "gas_tank": 170.47, "gas_tankless": 93.7, "gas_tankless_basic": 109.9 }, "saving_per_year_usd": { "gas_tankless": 76.77, "gas_tankless_basic": 60.57 }, "saving_pct": 45.0, "saving_basic_pct": 35.5, "years_per_1000_usd": 13.0 }, "medium": { "cost_per_year_usd": { "gas_tank": 222.03, "gas_tankless": 135.62, "gas_tankless_basic": 159.06 }, "saving_per_year_usd": { "gas_tankless": 86.41, "gas_tankless_basic": 62.97 }, "saving_pct": 38.9, "saving_basic_pct": 28.4, "years_per_1000_usd": 11.6 }, "high": { "cost_per_year_usd": { "gas_tank": 307.46, "gas_tankless": 207.13, "gas_tankless_basic": 242.93 }, "saving_per_year_usd": { "gas_tankless": 100.33, "gas_tankless_basic": 64.53 }, "saving_pct": 32.6, "saving_basic_pct": 21.0, "years_per_1000_usd": 10.0 } }, "propane": { "usd_per_gallon": 2.932, "period_start": "2025-10", "period_end": "2026-03", "cost_per_year_usd": { "propane_tank": 612.2, "propane_tankless": 374.12 }, "saving_per_year_usd": 238.08, "years_per_1000_usd": 4.2, "status": "assumed" } }, "RI": { "code": "RI", "name": "Rhode Island", "slug": "rhode-island", "electricity_cents_per_kwh": 29.27, "gas_usd_per_therm": 2.107, "gas_basis": "calendar_year", "gas_period_label": "calendar year 2024", "gas_estimated_usd_per_therm": null, "eia_average": { "gas_usd_per_therm": 2.107, "cost_per_month_usd": { "gas_tank": 33.53, "gas_tankless": 20.48, "gas_tankless_basic": 24.03, "electric_tank": 86.05, "electric_tankless_basic": 87.07, "electric_tankless_ceiling": 79.23, "heat_pump": 22.0 }, "cost_per_year_usd": { "gas_tank": 402.42, "gas_tankless": 245.8, "gas_tankless_basic": 288.3, "electric_tank": 1032.65, "electric_tankless_basic": 1044.79, "electric_tankless_ceiling": 950.75, "heat_pump": 264.02 }, "saving_per_year_usd": { "gas_tankless": 156.62, "gas_tankless_basic": 114.12, "electric_tankless_at_minimum": -12.14, "electric_tankless_at_most": 81.9 }, "years_per_1000_usd": 6.4, "saved_over_life_usd": 3140.0, "heat_pump_under_gas_tankless_per_year_usd": -18.22, "gas_price_basis": "eia_average" }, "estimated": { "gas_usd_per_therm": 2.107, "cost_per_month_usd": { "gas_tank": 33.53, "gas_tankless": 20.48, "gas_tankless_basic": 24.03, "electric_tank": 86.05, "electric_tankless_basic": 87.07, "electric_tankless_ceiling": 79.23, "heat_pump": 22.0 }, "cost_per_year_usd": { "gas_tank": 402.42, "gas_tankless": 245.8, "gas_tankless_basic": 288.3, "electric_tank": 1032.65, "electric_tankless_basic": 1044.79, "electric_tankless_ceiling": 950.75, "heat_pump": 264.02 }, "saving_per_year_usd": { "gas_tankless": 156.62, "gas_tankless_basic": 114.12, "electric_tankless_at_minimum": -12.14, "electric_tankless_at_most": 81.9 }, 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3.629, "period_start": "2025-10", "period_end": "2026-03", "cost_per_year_usd": { "propane_tank": 757.74, "propane_tankless": 463.06 }, "saving_per_year_usd": 294.68, "years_per_1000_usd": 3.4, "status": "assumed" } }, "SC": { "code": "SC", "name": "South Carolina", "slug": "south-carolina", "electricity_cents_per_kwh": 15.64, "gas_usd_per_therm": 1.637, "gas_basis": "calendar_year", "gas_period_label": "calendar year 2024", "gas_estimated_usd_per_therm": 1.4618, "eia_average": { "gas_usd_per_therm": 1.637, "cost_per_month_usd": { "gas_tank": 26.05, "gas_tankless": 15.91, "gas_tankless_basic": 18.67, "electric_tank": 45.98, "electric_tankless_basic": 46.52, "electric_tankless_ceiling": 42.33, "heat_pump": 11.76 }, "cost_per_year_usd": { "gas_tank": 312.65, "gas_tankless": 190.97, "gas_tankless_basic": 223.99, "electric_tank": 551.78, "electric_tankless_basic": 558.27, "electric_tankless_ceiling": 508.02, "heat_pump": 141.07 }, "saving_per_year_usd": { "gas_tankless": 121.68, 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36.7, "heat_pump": 10.19 }, "cost_per_year_usd": { "gas_tank": 180.96, "gas_tankless": 110.54, "gas_tankless_basic": 129.65, "electric_tank": 478.4, "electric_tankless_basic": 484.02, "electric_tankless_ceiling": 440.46, "heat_pump": 122.31 }, "saving_per_year_usd": { "gas_tankless": 70.42, "gas_tankless_basic": 51.31, "electric_tankless_at_minimum": -5.62, "electric_tankless_at_most": 37.94 }, "years_per_1000_usd": 14.2, "saved_over_life_usd": 1400.0, "heat_pump_under_gas_tankless_per_year_usd": -11.77, "gas_price_basis": "estimated_per_therm" }, "household": { "low": { "cost_per_year_usd": { "gas_tank": 138.94, "gas_tankless": 76.37, "gas_tankless_basic": 89.58 }, "saving_per_year_usd": { "gas_tankless": 62.57, "gas_tankless_basic": 49.36 }, "saving_pct": 45.0, "saving_basic_pct": 35.5, "years_per_1000_usd": 16.0 }, "medium": { "cost_per_year_usd": { "gas_tank": 180.96, "gas_tankless": 110.54, "gas_tankless_basic": 129.65 }, "saving_per_year_usd": { "gas_tankless": 70.42, "gas_tankless_basic": 51.31 }, "saving_pct": 38.9, "saving_basic_pct": 28.4, "years_per_1000_usd": 14.2 }, "high": { "cost_per_year_usd": { "gas_tank": 250.59, "gas_tankless": 168.83, "gas_tankless_basic": 198.0 }, "saving_per_year_usd": { "gas_tankless": 81.76, "gas_tankless_basic": 52.59 }, "saving_pct": 32.6, "saving_basic_pct": 21.0, "years_per_1000_usd": 12.2 } }, "propane": { "usd_per_gallon": 3.145, "period_start": "2025-10", "period_end": "2026-03", "cost_per_year_usd": { "propane_tank": 656.68, "propane_tankless": 401.3 }, "saving_per_year_usd": 255.38, "years_per_1000_usd": 3.9, "status": "assumed" } }, "TX": { "code": "TX", "name": "Texas", "slug": "texas", "electricity_cents_per_kwh": 15.96, "gas_usd_per_therm": 2.2403, "gas_basis": "trailing_12_months", "gas_period_label": "12 months to Jul 2026", "gas_estimated_usd_per_therm": 1.2523, "eia_average": { "gas_usd_per_therm": 2.2403, "cost_per_month_usd": { "gas_tank": 35.66, "gas_tankless": 21.78, "gas_tankless_basic": 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"cost_per_year_usd": { "gas_tank": 331.21, "gas_tankless": 223.13, "gas_tankless_basic": 261.69 }, "saving_per_year_usd": { "gas_tankless": 108.08, "gas_tankless_basic": 69.52 }, "saving_pct": 32.6, "saving_basic_pct": 21.0, "years_per_1000_usd": 9.3 } }, "propane": { "usd_per_gallon": 2.939, "period_start": "2025-10", "period_end": "2026-03", "cost_per_year_usd": { "propane_tank": 613.66, "propane_tankless": 375.02 }, "saving_per_year_usd": 238.64, "years_per_1000_usd": 4.2, "status": "assumed" } }, "UT": { "code": "UT", "name": "Utah", "slug": "utah", "electricity_cents_per_kwh": 13.32, "gas_usd_per_therm": 1.0557, "gas_basis": "trailing_12_months", "gas_period_label": "12 months to Jul 2026", "gas_estimated_usd_per_therm": null, "eia_average": { "gas_usd_per_therm": 1.0557, "cost_per_month_usd": { "gas_tank": 16.8, "gas_tankless": 10.26, "gas_tankless_basic": 12.04, "electric_tank": 39.16, "electric_tankless_basic": 39.62, "electric_tankless_ceiling": 36.06, "heat_pump": 10.01 }, 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91.11, "gas_tankless_basic": 58.6 }, "saving_pct": 32.6, "saving_basic_pct": 21.0, "years_per_1000_usd": 11.0 } }, "propane": { "usd_per_gallon": 2.292, "period_start": "2025-10", "period_end": "2026-03", "cost_per_year_usd": { "propane_tank": 478.57, "propane_tankless": 292.46 }, "saving_per_year_usd": 186.11, "years_per_1000_usd": 5.4, "status": "assumed" } }, "VT": { "code": "VT", "name": "Vermont", "slug": "vermont", "electricity_cents_per_kwh": 23.8, "gas_usd_per_therm": 1.7493, "gas_basis": "trailing_12_months", "gas_period_label": "12 months to Jul 2026", "gas_estimated_usd_per_therm": 1.3174, "eia_average": { "gas_usd_per_therm": 1.7493, "cost_per_month_usd": { "gas_tank": 27.84, "gas_tankless": 17.01, "gas_tankless_basic": 19.95, "electric_tank": 69.97, "electric_tankless_basic": 70.8, "electric_tankless_ceiling": 64.42, "heat_pump": 17.89 }, "cost_per_year_usd": { "gas_tank": 334.1, "gas_tankless": 204.07, "gas_tankless_basic": 239.36, "electric_tank": 839.66, "electric_tankless_basic": 849.54, "electric_tankless_ceiling": 773.07, "heat_pump": 214.68 }, "saving_per_year_usd": { "gas_tankless": 130.03, "gas_tankless_basic": 94.74, "electric_tankless_at_minimum": -9.88, "electric_tankless_at_most": 66.59 }, "years_per_1000_usd": 7.7, "saved_over_life_usd": 2600.0, "heat_pump_under_gas_tankless_per_year_usd": -10.61, "gas_price_basis": "eia_average" }, "estimated": { "gas_usd_per_therm": 1.3174, "cost_per_month_usd": { "gas_tank": 20.97, "gas_tankless": 12.81, "gas_tankless_basic": 15.02, "electric_tank": 69.97, "electric_tankless_basic": 70.8, "electric_tankless_ceiling": 64.42, "heat_pump": 17.89 }, "cost_per_year_usd": { "gas_tank": 251.61, "gas_tankless": 153.69, "gas_tankless_basic": 180.26, "electric_tank": 839.66, "electric_tankless_basic": 849.54, "electric_tankless_ceiling": 773.07, "heat_pump": 214.68 }, "saving_per_year_usd": { "gas_tankless": 97.92, "gas_tankless_basic": 71.35, "electric_tankless_at_minimum": -9.88, 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"heat_pump_under_gas_tankless_per_year_usd": 2.69, "gas_price_basis": "estimated_per_therm" }, "household": { "low": { "cost_per_year_usd": { "gas_tank": 190.24, "gas_tankless": 104.56, "gas_tankless_basic": 122.65 }, "saving_per_year_usd": { "gas_tankless": 85.68, "gas_tankless_basic": 67.59 }, "saving_pct": 45.0, "saving_basic_pct": 35.5, "years_per_1000_usd": 11.7 }, "medium": { "cost_per_year_usd": { "gas_tank": 247.77, "gas_tankless": 151.34, "gas_tankless_basic": 177.51 }, "saving_per_year_usd": { "gas_tankless": 96.43, "gas_tankless_basic": 70.26 }, "saving_pct": 38.9, "saving_basic_pct": 28.4, "years_per_1000_usd": 10.4 }, "high": { "cost_per_year_usd": { "gas_tank": 343.11, "gas_tankless": 231.15, "gas_tankless_basic": 271.1 }, "saving_per_year_usd": { "gas_tankless": 111.96, "gas_tankless_basic": 72.01 }, "saving_pct": 32.6, "saving_basic_pct": 21.0, "years_per_1000_usd": 8.9 } }, "propane": { "usd_per_gallon": 3.461, "period_start": "2025-10", "period_end": "2026-03", "cost_per_year_usd": { "propane_tank": 722.66, "propane_tankless": 441.62 }, "saving_per_year_usd": 281.04, "years_per_1000_usd": 3.6, "status": "assumed" } }, "WA": { "code": "WA", "name": "Washington", "slug": "washington", "electricity_cents_per_kwh": 14.12, "gas_usd_per_therm": 1.6077, "gas_basis": "calendar_year", "gas_period_label": "calendar year 2025", "gas_estimated_usd_per_therm": 1.2135, "eia_average": { "gas_usd_per_therm": 1.6077, "cost_per_month_usd": { "gas_tank": 25.59, "gas_tankless": 15.63, "gas_tankless_basic": 18.33, "electric_tank": 41.51, "electric_tankless_basic": 42.0, "electric_tankless_ceiling": 38.22, "heat_pump": 10.61 }, "cost_per_year_usd": { "gas_tank": 307.05, "gas_tankless": 187.55, "gas_tankless_basic": 219.98, "electric_tank": 498.15, "electric_tankless_basic": 504.01, "electric_tankless_ceiling": 458.65, "heat_pump": 127.36 }, "saving_per_year_usd": { "gas_tankless": 119.5, "gas_tankless_basic": 87.07, "electric_tankless_at_minimum": -5.86, "electric_tankless_at_most": 39.5 }, "years_per_1000_usd": 8.4, "saved_over_life_usd": 2400.0, "heat_pump_under_gas_tankless_per_year_usd": 60.19, "gas_price_basis": "eia_average" }, "estimated": { "gas_usd_per_therm": 1.2135, "cost_per_month_usd": { "gas_tank": 19.31, "gas_tankless": 11.8, "gas_tankless_basic": 13.84, "electric_tank": 41.51, "electric_tankless_basic": 42.0, "electric_tankless_ceiling": 38.22, "heat_pump": 10.61 }, "cost_per_year_usd": { "gas_tank": 231.77, "gas_tankless": 141.57, "gas_tankless_basic": 166.04, "electric_tank": 498.15, "electric_tankless_basic": 504.01, "electric_tankless_ceiling": 458.65, "heat_pump": 127.36 }, "saving_per_year_usd": { "gas_tankless": 90.2, "gas_tankless_basic": 65.73, "electric_tankless_at_minimum": -5.86, "electric_tankless_at_most": 39.5 }, "years_per_1000_usd": 11.1, "saved_over_life_usd": 1800.0, "heat_pump_under_gas_tankless_per_year_usd": 14.21, "gas_price_basis": "estimated_per_therm" }, "household": { "low": { "cost_per_year_usd": { "gas_tank": 177.95, "gas_tankless": 97.81, "gas_tankless_basic": 114.72 }, "saving_per_year_usd": { "gas_tankless": 80.14, "gas_tankless_basic": 63.23 }, "saving_pct": 45.0, "saving_basic_pct": 35.5, "years_per_1000_usd": 12.5 }, "medium": { "cost_per_year_usd": { "gas_tank": 231.77, "gas_tankless": 141.57, "gas_tankless_basic": 166.04 }, "saving_per_year_usd": { "gas_tankless": 90.2, "gas_tankless_basic": 65.73 }, "saving_pct": 38.9, "saving_basic_pct": 28.4, "years_per_1000_usd": 11.1 }, "high": { "cost_per_year_usd": { "gas_tank": 320.95, "gas_tankless": 216.22, "gas_tankless_basic": 253.59 }, "saving_per_year_usd": { "gas_tankless": 104.73, "gas_tankless_basic": 67.36 }, "saving_pct": 32.6, "saving_basic_pct": 21.0, "years_per_1000_usd": 9.5 } }, "propane": null }, "WV": { "code": "WV", "name": "West Virginia", "slug": "west-virginia", "electricity_cents_per_kwh": 15.48, "gas_usd_per_therm": 1.2695, "gas_basis": "calendar_year", "gas_period_label": "calendar year 2025", "gas_estimated_usd_per_therm": 1.0216, "eia_average": { "gas_usd_per_therm": 1.2695, "cost_per_month_usd": { "gas_tank": 20.21, "gas_tankless": 12.34, "gas_tankless_basic": 14.48, "electric_tank": 45.51, "electric_tankless_basic": 46.05, "electric_tankless_ceiling": 41.9, "heat_pump": 11.64 }, "cost_per_year_usd": { "gas_tank": 242.46, "gas_tankless": 148.1, "gas_tankless_basic": 173.71, "electric_tank": 546.13, "electric_tankless_basic": 552.56, "electric_tankless_ceiling": 502.82, "heat_pump": 139.63 }, "saving_per_year_usd": { "gas_tankless": 94.36, "gas_tankless_basic": 68.75, "electric_tankless_at_minimum": -6.43, "electric_tankless_at_most": 43.31 }, "years_per_1000_usd": 10.6, "saved_over_life_usd": 1880.0, "heat_pump_under_gas_tankless_per_year_usd": 8.47, "gas_price_basis": "eia_average" }, "estimated": { "gas_usd_per_therm": 1.0216, "cost_per_month_usd": { "gas_tank": 16.26, "gas_tankless": 9.93, "gas_tankless_basic": 11.65, "electric_tank": 45.51, "electric_tankless_basic": 46.05, "electric_tankless_ceiling": 41.9, "heat_pump": 11.64 }, "cost_per_year_usd": { "gas_tank": 195.12, "gas_tankless": 119.18, "gas_tankless_basic": 139.79, "electric_tank": 546.13, "electric_tankless_basic": 552.56, "electric_tankless_ceiling": 502.82, "heat_pump": 139.63 }, "saving_per_year_usd": { "gas_tankless": 75.94, "gas_tankless_basic": 55.33, "electric_tankless_at_minimum": -6.43, "electric_tankless_at_most": 43.31 }, "years_per_1000_usd": 13.2, "saved_over_life_usd": 1520.0, "heat_pump_under_gas_tankless_per_year_usd": -20.45, "gas_price_basis": "estimated_per_therm" }, "household": { "low": { "cost_per_year_usd": { "gas_tank": 149.81, "gas_tankless": 82.34, "gas_tankless_basic": 96.58 }, "saving_per_year_usd": { "gas_tankless": 67.47, "gas_tankless_basic": 53.23 }, "saving_pct": 45.0, "saving_basic_pct": 35.5, "years_per_1000_usd": 14.8 }, "medium": { "cost_per_year_usd": { "gas_tank": 195.12, "gas_tankless": 119.18, "gas_tankless_basic": 139.79 }, "saving_per_year_usd": { "gas_tankless": 75.94, "gas_tankless_basic": 55.33 }, "saving_pct": 38.9, "saving_basic_pct": 28.4, "years_per_1000_usd": 13.2 }, "high": { "cost_per_year_usd": { "gas_tank": 270.19, "gas_tankless": 182.03, "gas_tankless_basic": 213.48 }, "saving_per_year_usd": { "gas_tankless": 88.16, "gas_tankless_basic": 56.71 }, "saving_pct": 32.6, "saving_basic_pct": 21.0, "years_per_1000_usd": 11.3 } }, "propane": null }, "WI": { "code": "WI", "name": "Wisconsin", "slug": "wisconsin", "electricity_cents_per_kwh": 18.74, "gas_usd_per_therm": 1.0238, "gas_basis": "calendar_year", "gas_period_label": "calendar year 2025", "gas_estimated_usd_per_therm": 0.8554, "eia_average": { "gas_usd_per_therm": 1.0238, "cost_per_month_usd": { "gas_tank": 16.29, "gas_tankless": 9.95, "gas_tankless_basic": 11.67, "electric_tank": 55.1, "electric_tankless_basic": 55.74, "electric_tankless_ceiling": 50.73, "heat_pump": 14.09 }, "cost_per_year_usd": { "gas_tank": 195.54, "gas_tankless": 119.44, "gas_tankless_basic": 140.09, "electric_tank": 661.15, "electric_tankless_basic": 668.92, "electric_tankless_ceiling": 608.71, "heat_pump": 169.03 }, "saving_per_year_usd": { "gas_tankless": 76.1, "gas_tankless_basic": 55.45, "electric_tankless_at_minimum": -7.77, "electric_tankless_at_most": 52.44 }, "years_per_1000_usd": 13.1, "saved_over_life_usd": 1520.0, "heat_pump_under_gas_tankless_per_year_usd": -49.59, "gas_price_basis": "eia_average" }, "estimated": { "gas_usd_per_therm": 0.8554, "cost_per_month_usd": { "gas_tank": 13.61, "gas_tankless": 8.32, "gas_tankless_basic": 9.75, "electric_tank": 55.1, "electric_tankless_basic": 55.74, "electric_tankless_ceiling": 50.73, "heat_pump": 14.09 }, "cost_per_year_usd": { "gas_tank": 163.37, "gas_tankless": 99.79, "gas_tankless_basic": 117.04, "electric_tank": 661.15, "electric_tankless_basic": 668.92, "electric_tankless_ceiling": 608.71, "heat_pump": 169.03 }, "saving_per_year_usd": { "gas_tankless": 63.58, "gas_tankless_basic": 46.33, "electric_tankless_at_minimum": -7.77, "electric_tankless_at_most": 52.44 }, "years_per_1000_usd": 15.7, "saved_over_life_usd": 1280.0, "heat_pump_under_gas_tankless_per_year_usd": -69.24, "gas_price_basis": "estimated_per_therm" }, "household": { "low": { "cost_per_year_usd": { "gas_tank": 125.44, "gas_tankless": 68.95, "gas_tankless_basic": 80.87 }, "saving_per_year_usd": { "gas_tankless": 56.49, "gas_tankless_basic": 44.57 }, "saving_pct": 45.0, "saving_basic_pct": 35.5, "years_per_1000_usd": 17.7 }, "medium": { "cost_per_year_usd": { "gas_tank": 163.37, "gas_tankless": 99.79, "gas_tankless_basic": 117.04 }, "saving_per_year_usd": { "gas_tankless": 63.58, "gas_tankless_basic": 46.33 }, "saving_pct": 38.9, "saving_basic_pct": 28.4, "years_per_1000_usd": 15.7 }, "high": { "cost_per_year_usd": { "gas_tank": 226.24, "gas_tankless": 152.42, "gas_tankless_basic": 178.75 }, "saving_per_year_usd": { "gas_tankless": 73.82, "gas_tankless_basic": 47.49 }, "saving_pct": 32.6, "saving_basic_pct": 21.0, "years_per_1000_usd": 13.5 } }, "propane": { "usd_per_gallon": 1.909, "period_start": "2025-10", "period_end": "2026-03", "cost_per_year_usd": { "propane_tank": 398.6, "propane_tankless": 243.59 }, "saving_per_year_usd": 155.01, "years_per_1000_usd": 6.5, "status": "assumed" } }, "WY": { "code": "WY", "name": "Wyoming", "slug": "wyoming", "electricity_cents_per_kwh": 14.01, "gas_usd_per_therm": 1.2336, "gas_basis": "trailing_12_months", "gas_period_label": "12 months to Jul 2026", "gas_estimated_usd_per_therm": 0.7818, "eia_average": { "gas_usd_per_therm": 1.2336, "cost_per_month_usd": { "gas_tank": 19.63, "gas_tankless": 11.99, "gas_tankless_basic": 14.07, "electric_tank": 41.19, "electric_tankless_basic": 41.67, "electric_tankless_ceiling": 37.92, "heat_pump": 10.53 }, "cost_per_year_usd": { "gas_tank": 235.61, "gas_tankless": 143.91, "gas_tankless_basic": 168.79, "electric_tank": 494.27, "electric_tankless_basic": 500.09, "electric_tankless_ceiling": 455.07, "heat_pump": 126.37 }, "saving_per_year_usd": { "gas_tankless": 91.7, "gas_tankless_basic": 66.82, "electric_tankless_at_minimum": -5.82, "electric_tankless_at_most": 39.2 }, "years_per_1000_usd": 10.9, "saved_over_life_usd": 1840.0, "heat_pump_under_gas_tankless_per_year_usd": 17.54, "gas_price_basis": "eia_average" }, "estimated": { "gas_usd_per_therm": 0.7818, "cost_per_month_usd": { "gas_tank": 12.44, "gas_tankless": 7.6, "gas_tankless_basic": 8.91, "electric_tank": 41.19, "electric_tankless_basic": 41.67, "electric_tankless_ceiling": 37.92, "heat_pump": 10.53 }, "cost_per_year_usd": { "gas_tank": 149.32, "gas_tankless": 91.2, "gas_tankless_basic": 106.97, "electric_tank": 494.27, "electric_tankless_basic": 500.09, "electric_tankless_ceiling": 455.07, "heat_pump": 126.37 }, "saving_per_year_usd": { "gas_tankless": 58.12, "gas_tankless_basic": 42.35, "electric_tankless_at_minimum": -5.82, "electric_tankless_at_most": 39.2 }, "years_per_1000_usd": 17.2, "saved_over_life_usd": 1160.0, "heat_pump_under_gas_tankless_per_year_usd": -35.17, "gas_price_basis": "estimated_per_therm" }, "household": { "low": { "cost_per_year_usd": { "gas_tank": 114.64, "gas_tankless": 63.01, "gas_tankless_basic": 73.91 }, "saving_per_year_usd": { "gas_tankless": 51.63, "gas_tankless_basic": 40.73 }, "saving_pct": 45.0, "saving_basic_pct": 35.5, "years_per_1000_usd": 19.4 }, "medium": { "cost_per_year_usd": { "gas_tank": 149.32, "gas_tankless": 91.2, "gas_tankless_basic": 106.97 }, "saving_per_year_usd": { "gas_tankless": 58.12, "gas_tankless_basic": 42.35 }, "saving_pct": 38.9, "saving_basic_pct": 28.4, "years_per_1000_usd": 17.2 }, "high": { "cost_per_year_usd": { "gas_tank": 206.77, "gas_tankless": 139.3, "gas_tankless_basic": 163.37 }, "saving_per_year_usd": { "gas_tankless": 67.47, "gas_tankless_basic": 43.4 }, "saving_pct": 32.6, "saving_basic_pct": 21.0, "years_per_1000_usd": 14.8 } }, "propane": null } }, "missing": [], "counts": { "estimated": { "total": 51, "repays_within_life": { "1000": 49, "2000": 15, "3000": 5, "4000": 1 }, "heat_pump_cheaper_than_gas_tankless": 17, "electric_tankless_saves_nothing_at_minimum": 51, "states_on_eia_average": [ "AR", "CA", "HI", "MA", "NV", "NH", "NM", "RI", "UT" ] }, "eia_average": { "total": 51, "repays_within_life": { "1000": 51, "2000": 32, "3000": 8, "4000": 1 }, "heat_pump_cheaper_than_gas_tankless": 28, "electric_tankless_saves_nothing_at_minimum": 51 }, "propane_states": 38 }, "payback_grid": { "yearly_saving_usd": [ 50, 75, 100, 125, 150, 200, 250 ], "extra_cost_usd": [ 500, 1000, 1500, 2000, 3000, 4000 ], "years": [ [ 10.0, 6.7, 5.0, 4.0, 3.3, 2.5, 2.0 ], [ 20.0, 13.3, 10.0, 8.0, 6.7, 5.0, 4.0 ], [ 30.0, 20.0, 15.0, 12.0, 10.0, 7.5, 6.0 ], [ 40.0, 26.7, 20.0, 16.0, 13.3, 10.0, 8.0 ], [ 60.0, 40.0, 30.0, 24.0, 20.0, 15.0, 12.0 ], [ 80.0, 53.3, 40.0, 32.0, 26.7, 20.0, 16.0 ] ] } }