Plumbing · Most recent water heater permit 25+ years old

Water Heater Age Beyond Typical Lifespan

If the most recent water heater permit on file is 25 or more years old, the unit is likely well past its typical 15-year service life, and its pressure-relief valve's condition is uncertain from records alone.

What it is

A water heater's temperature-and-pressure relief valve (TPRV) is a safety valve that releases pressure if the tank overheats or over-pressurizes, preventing a tank rupture. Most residential water heaters are built for roughly a 15-year service life; a most-recent permit 25+ years old suggests the current unit may be original or close to it.

Why it matters

Past its expected lifespan, a water heater is more prone to leaks and tank failure, and permit history alone can't confirm whether the TPRV is still functioning correctly.

What's worth doing next

Worth having a plumber check the unit's manufacture date (usually stamped on the tank itself, more reliable than permit history) and TPRV function during a routine inspection — replacement is a planned, predictable expense when caught early rather than an emergency.

Code changes like these are prospective — they apply to new construction going forward, not retroactively to homes already built. A home that predates a given standard isn't out of compliance with anything; it just predates it. Tarn surfaces this as a consideration worth having evaluated, not a verdict on the home.

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Enter the year built alongside an address search, and Tarn checks it against this and every other code-era risk factor automatically.

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