{
 "page": "/us/lifespan/tankless-water-heater",
 "built_from": "data/lifespan/facts/tankless-water-heater.json",
 "rows": [
  {
   "type": "Tankless water heaters",
   "measure": "life expectancy (ENERGY STAR statement)",
   "value": 20,
   "value_high": null,
   "unit": "years",
   "source": "ENERGY STAR, gas tankless water heaters page",
   "url": "https://www.energystar.gov/node/5771",
   "data_years": "no issue date",
   "read": "2026-10-29",
   "area": "US",
   "n": "not published by the source",
   "se_points": null,
   "fact_id": "tw-energystar-life-expectancy-20"
  },
  {
   "type": "Consumer gas-fired instantaneous water heaters (mostly tankless models)",
   "measure": "average product lifetime, around (DOE estimate)",
   "value": 20,
   "value_high": null,
   "unit": "years",
   "source": "U.S. DOE, 2024 gas-fired instantaneous water heater rule (withdrawn 2025)",
   "url": "https://www.govinfo.gov/content/pkg/FR-2024-12-26/html/2024-30369.htm",
   "data_years": "1974-2021",
   "read": "2026-10-29",
   "area": "US",
   "n": "not published by the source",
   "se_points": null,
   "fact_id": "doe-2024-gas-instantaneous-water-heater-lifetime"
  },
  {
   "type": "Gas-fired storage (tank) water heaters",
   "measure": "average lifetime, approximately (DOE estimate, same rule)",
   "value": 14.5,
   "value_high": null,
   "unit": "years",
   "source": "U.S. DOE, 2024 gas-fired instantaneous water heater rule (withdrawn 2025)",
   "url": "https://www.govinfo.gov/content/pkg/FR-2024-12-26/html/2024-30369.htm",
   "data_years": "1974-2021",
   "read": "2026-10-29",
   "area": "US",
   "n": "not published by the source",
   "se_points": null,
   "fact_id": "tw-doe-2024-gas-storage-14-5"
  },
  {
   "type": "Tankless water heaters",
   "measure": "expected equipment life (Building America fact sheet)",
   "value": 20,
   "value_high": null,
   "unit": "years (the source says “more than 20 years”)",
   "source": "U.S. DOE Building America, Tankless Water Heaters fact sheet",
   "url": "https://www1.eere.energy.gov/buildings/publications/pdfs/building_america/tankless_water_heaters.pdf",
   "data_years": "last update 8-18-2009",
   "read": "2026-10-29",
   "area": "US",
   "n": "not published by the source",
   "se_points": null,
   "fact_id": "tw-ba-life-more-than-20"
  },
  {
   "type": "Traditional (tank) water heaters",
   "measure": "expected equipment life range (Building America fact sheet)",
   "value": 10,
   "value_high": 15,
   "unit": "years (the source says “10 to 15 years”)",
   "source": "U.S. DOE Building America, Tankless Water Heaters fact sheet",
   "url": "https://www1.eere.energy.gov/buildings/publications/pdfs/building_america/tankless_water_heaters.pdf",
   "data_years": "last update 8-18-2009",
   "read": "2026-10-29",
   "area": "US",
   "n": "not published by the source",
   "se_points": null,
   "fact_id": "tw-ba-traditional-10-15"
  },
  {
   "type": "Gas-fired instantaneous water heaters that ENERGY STAR certifies",
   "measure": "minimum warranty on the heat exchanger (a WARRANTY term, not a lifespan; parts: 5 years)",
   "value": 6,
   "value_high": null,
   "unit": "years",
   "source": "ENERGY STAR, Water Heater Key Product Criteria",
   "url": "https://www.energystar.gov/products/water_heaters/residential_water_heaters_key_product_criteria",
   "data_years": "no issue date",
   "read": "2026-10-29",
   "area": "US",
   "n": "not published by the source",
   "se_points": null,
   "fact_id": "tw-energystar-gas-instantaneous-warranty"
  },
  {
   "type": "Main water heater in EIA category “Tankless or on-demand” (share of US households in 2020; not a lifespan)",
   "measure": "weighted share",
   "value": 6.5,
   "value_high": null,
   "unit": "percent of households",
   "source": "U.S. EIA, 2020 Residential Energy Consumption Survey (RECS), public-use microdata v7",
   "url": "https://www.eia.gov/consumption/residential/data/2020/xls/RECS%202020%20Codebook%20for%20Public%20File%20-%20v7.xlsx",
   "data_years": "2020",
   "read": "2026-10-29",
   "area": "US",
   "n": 18496,
   "se_points": 0.2,
   "fact_id": "recs2020-wheatsiz-tankless-us"
  },
  {
   "type": "Main water heater in EIA category “Tankless or on-demand” (share of Florida households in 2020; not a lifespan)",
   "measure": "weighted share",
   "value": 5.9,
   "value_high": null,
   "unit": "percent of households",
   "source": "U.S. EIA, 2020 Residential Energy Consumption Survey (RECS), public-use microdata v7",
   "url": "https://www.eia.gov/consumption/residential/data/2020/xls/RECS%202020%20Codebook%20for%20Public%20File%20-%20v7.xlsx",
   "data_years": "2020",
   "read": "2026-10-29",
   "area": "Florida",
   "n": 655,
   "se_points": 1.0,
   "fact_id": "recs2020-wheatsiz-tankless-fl"
  }
 ]
}