In a nutshell
A conventional tank usually lasts somewhere between ten and fifteen years. The hard-ish lake water, a thermostat set high, and years without a flush all push it toward the short end. Find the date of manufacture, keep an eye out for the warning signs, and start pricing a replacement once you pass the ten-year mark.
Working through it
1. Date the tank
The rating label lists a serial number, and most makers build the year and month into it. Their websites explain the code, or we can read it for you.
2. Inspect the bottom and the connections
Orange streaks, chalky crust or damp patches mean water is escaping slowly.
3. Listen when it fires
Popping or rumbling is sediment boiling under a layer of scale.
4. Test the relief valve
Lift the small lever on the side briefly, a pail set beneath the pipe. It should release and snap shut cleanly.
5. Plan the swap
Ask about venting, size and rental terms before the old one fails.
Clues worth noticing
- A pool of water under the tank.
- Brown or rusty water from hot taps only.
- Showers running cold sooner than they used to.
- A relief valve that drips after you test it.
Signals that it needs a licensed plumber
If two or more of these signs show up, call before a leak makes the decision for you. Our gas water heater replacement page covers sizes, venting and rentals.
Calls we field, answered plainly
Is a twelve-year-old tank on borrowed time?
Not necessarily, but start planning. A failure at that age is common and not worth repairing.
Do electric tanks last longer?
Often a little, though their elements may need replacing along the way.