How long does a water heater last?

How long a water heater lasts

Published service life: 6–12 years. Roots plans for: year 9.

Service life is a planning horizon, not an expiry date. It tells you when to start budgeting, get a second quote, and stop paying for repairs on something near the end — not the day it stops working.

What changes this

Hard water shortens this considerably, and a tank that fails does it by dumping its full volume onto the floor. Worth planning at the earlier end if it sits above finished space.

Sources

• InterNACHI's Standard Estimated Life Expectancy Chart for Homes, cross-checked against the NAHB/Bank of America Study of Life Expectancy of Home Components (February 2007) (Water Heaters, Gas 10 and Water Heaters, Electric 11).

Service-life figures are typical estimates drawn from published industry references. Where a second reference covers the component, the figure is cross-checked against it and any disagreement is set out above; where only one reference covers it, that is stated. Actual life varies with installation, water quality, climate, and maintenance, and these figures shouldn't be relied on for insurance, lending, or warranty decisions.

Maintenance is what decides where in the range you land

The published range is wide for a reason: two identical units, installed the same day, routinely fail years apart. What separates them is upkeep.

For a water heater, the tasks that matter most:

• Flush water heater tank — Sediment buildup corrodes the tank from inside and is why most fail early.
• Test water heater pressure relief valve — A stuck T&P valve turns excess pressure into a genuine explosion hazard.
• Check water heater anode rod — A $30 anode rod swap is the single biggest extender of tank life.

Roots tracks the age of every component in your home alongside the upkeep that extends it, so the replacement is a planned expense instead of an emergency.