How long does a water heater last?

Service life varies widely with water quality and maintenance. Track the install date, watch for rust, noise and relief valve discharge, and plan replacement before failure rather than after.

Last reviewed 2026-07-15

Sediment accumulation and anode rod depletion are the two maintenance factors most within your control. Both are affected strongly by local water hardness.

Tank failures usually produce a flood, so a heater in a finished space near the end of its expected life deserves a proactive plan, a pan and a known shutoff.

What to check first

  • Install date on the data plate
  • Rust at fittings or the tank base, or damp beneath the unit
  • Rumbling or popping, which indicates sediment
  • Anode rod condition if accessible and previously serviced
  • Temperature and pressure relief valve discharge piping

When to call a professional

  • There is any leak from the tank body
  • The relief valve discharges repeatedly
  • The unit is gas-fired and shows soot, scorching or venting problems