Water heater age, warning signs, and when to replace

Jordan Hale · 02/08/2026

A storage water heater does not fail politely. It rusts from the inside, the anode rod disappears, and one day the tank opens at a seam. Knowing the age and the warning signs is cheaper than a ceiling repair.

Find the date

Look at the serial number on the rating plate. Many brands encode the year and week in the first four digits. If the sticker is gone, assume the unit is due if you have lived in the house more than a decade and nobody remembers a replacement.

Sounds and water quality

Popping or rumbling is sediment boiling under the element or burner. Drain a few gallons from the tank drain if the valve still opens. If the water runs brown for more than a minute, the tank lining is likely gone.

Lukewarm water at every tap often means a failing element or a gas burner that will not stay lit.
Water in the drain pan is never “condensation only” on a tank that is older than ten years.
A T&P valve that drips should be replaced, not capped.

Replacement window

If the unit is past twelve years, plan the swap before it plans you. Same-location electric swaps are straightforward. Moving to a heat pump or changing venting is a different job and needs a permit in most cities.

Keep the area clear: thirty inches in front of the unit, a working drain, and a shutoff you can actually turn. That is the difference between a two-hour visit and a half-day rebuild.

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