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Water heater leaking: repair or replace?

For homeowners

DOE estimates storage water heaters last around 15 years on average. HUD's inspection guide says leaking tanks cannot usually be repaired and must be replaced entirely, and that deposits around the tank fittings are usually a sign the tank is nearing the end of its service life. Updated 27 October 2026

(U.S. Department of Energy, 2024) (HUD, 2000) (HUD, 2000)

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Symptoms: what they can mean, who handles them, how soon

SymptomWhat the source says it can meanDIY or proUrgency
Leaking tank“Leaking tanks cannot usually be repaired and, therefore, must be replaced entirely.” (HUD, 2000)——
Leakage on the bottom of the tank: rust or water stains“Check for signs of leakage on the bottom of the tank, such as rust or water stains on or near fuel burning components …” (HUD, 2000)——
Deposits around the tank fittings“… deposits around the tank fittings are usually a sign that the tank is nearing the end of its service life.” (HUD, 2000)—plan (HUD, 2000)
Soot on top of the tank“A clogged flue or chimney will deposit soot on top of the tank under the draft hood.” (HUD, 2000)——
Soft water: rust, leaks, premature failure“Soft water will rust and eat away at ferrous (iron-containing) components in the water heater resulting in leaks and premature failure …” (Pacific Northwest National Laboratory (DOE), 2013)——

An em dash (—) means the cited source does not specify who should handle the work or how soon.

How long it lasts

DOE's 2024 rule estimates an average lifetime of around 15 years for storage water heaters. HUD's 2000 guide gives about 11 to 13 years for gas-fired tanks and about 14 for electric ones, and PNNL (2013) says water heater life is generally 8 to 20 years.

What to put in your request

How long does a tank water heater last?

DOE estimates an average lifetime of around 15 years for storage water heaters. HUD's 2000 guide gives about 11 to 13 years for gas-fired tanks and about 14 years for electric ones.

(U.S. Department of Energy, 2024) (HUD, 2000) (HUD, 2000)

Can a leaking water heater be repaired?

Usually not, if the tank itself leaks: HUD's inspection guide says leaking tanks cannot usually be repaired and must be replaced entirely. It also says to look for rust or water stains on the bottom of the tank.

(HUD, 2000) (HUD, 2000)

What shortens a water heater's life?

PNNL (2013) says water heater life is generally 8 to 20 years, varying with factors including type and water quality, and that soft water can rust ferrous components and lead to leaks and premature failure.

(Pacific Northwest National Laboratory (DOE), 2013) (Pacific Northwest National Laboratory (DOE), 2013)

Can you test a water heater's relief valve yourself?

HUD's guide says the pressure relief valve can be tested by pressing the test lever, but warns it may stick open.

(HUD, 2000)

What does soot on a water heater mean?

HUD's inspection guide says a clogged flue or chimney will deposit soot on top of the tank under the draft hood.

(HUD, 2000)

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