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How long does a boiler last?

In its 2016 residential boiler rule, the U.S. Department of Energy (DOE) used an average lifetime of 26.5 years for hot water gas-fired boilers (2016 rule, data 1974-2013 plus an undated AHRI contractor survey, read 2026-10-17, national, n not published by the source).

Source: DOE 2016 residential boiler rule, read 17 October 2026.

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From the public microdata of the 2020 home energy survey by the U.S. Energy Information Administration (EIA), InstaBids found that 51.3% of US households whose main space heating equipment is a steam or hot water system with radiators or pipes had it 15 or more years old (EIA RECS 2020, read 2026-10-17, n = 1,510, SE 1.5 points), and 69.5% had it 10 or more years old (EIA RECS 2020, read 2026-10-17, n = 1,510, SE 1.3 points). EIA's category label is “Steam or hot water system with radiators or pipes”. EIA imputed (filled in statistically) the age for 17.9% of the US households counted, and every system counted was still heating a home, so these shares are ages, never lifespans.

Researched by the InstaBids editorial team. Last checked: 17 October 2026 Updated 2026-10-17

In our own counts, n is the number of surveyed households behind a share and SE is its standard error, a measure of sampling error, in percentage points.

How long it lasts, by source

For electric models, DOE used the gas-fired lifetimes in its 2016 rule; its “Product Lifetime” section reads: “For electric boilers, DOE assumed the same lifetime as gas-fired boilers.” (2016 rule, data 1974-2013 plus an undated AHRI contractor survey, read 2026-10-17, national).

In its 2016 rule, DOE used the same lifetime for condensing and non-condensing boilers, “Based on the lack of clear and convincing information that condensing boilers have a shorter lifetime”, while assuming “different service lifetimes for heat exchangers for condensing boilers and non-condensing boilers” (2016 rule, data 1974-2013 plus an undated AHRI contractor survey, read 2026-10-17, national).

Fannie Mae's estimated useful life tables list 25 years for a “Unit Level Boiler” under dwelling-unit equipment, in the “Multifamily / Coop” column (table version 10/14, read 2026-10-17, national, multifamily, n not published by the source). That is a planning life used in condition assessments of multifamily properties, not a measured life of a boiler in a house, so it is shown on its own and never blended with the DOE averages.

ENERGY STAR, a program of the U.S. Environmental Protection Agency (EPA) and DOE, has one age for boilers, and it is guidance rather than a measured life: its list of signs that it may be time to call a contractor includes “Your furnace or boiler is more than 15 years old.” (no issue date, read 2026-10-17, national, n not published by the source).

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Sources for the figures on this page