When to replace your water heater (and when to repair)

Eight years is a number worth remembering. Here's how to think about repair vs replacement.

The 8-year rule of thumb

Tank water heaters typically last 8–12 years. Tankless units last 15–20 with maintenance. If your unit is under 8 and the failure is in a discrete part — element, thermocouple, gas valve, anode rod, T&P valve — repair is usually the right call. Past 10, replacement almost always wins on total cost.

Symptoms that lean toward replace

Rust-colored hot water (the tank is corroding from the inside). Pooling water around the base (the tank is breached and there's no fix for that). Loud rumbling or popping (sediment buildup that's killing efficiency and cracking the lining). Repeated trips of the breaker or pilot going out — past a few visits, you're throwing good money after bad.

Sizing your replacement

A 40-gallon tank is typical for a 2-bath home with 2–3 occupants. 50-gallon for 3 baths or 4+ occupants. Tankless sizing depends on your peak gallons-per-minute demand and your incoming water temperature — too small and you'll get a cold sandwich at the second shower. We measure both before recommending.

What gets installed beyond the tank

A proper install also replaces the supply lines, gas flex, T&P discharge tube, expansion tank, and shut-off valve. Old straps get re-strapped to current code (earthquake or otherwise). Vent the gas correctly or wire the breaker correctly — either is where most DIY installs go wrong and create real safety risk.