Repair or Replace Water Heater Calculator

Repair or replace your water heater?

Type Age in years Repair quote ($) Replacement quote ($) Is the tank itself leaking? Had other repairs in the last 2 years?

Uses the common rule of thumb that replacement makes sense when a repair costs half or more of a new heater, adjusted for age. Typical lifespans: tanks about 8 to 12 years, heat pump units 10 to 15, tankless about 20 with regular descaling.

When a water heater breaks, the real question is whether the repair is worth it. The calculator above weighs the three things that matter most: how old the heater is, how the repair cost compares to a new heater, and whether the tank itself is leaking.

It is a starting point, not a verdict. A plumber who can see the heater may spot something that changes the answer.

The rules of thumb behind it

The 50 percent rule

If a repair costs half or more of a new installed heater, replacement usually makes more sense, especially on an older unit.

Age and expected lifespan

Tank water heaters typically last about 8 to 12 years, heat pump units about 10 to 15, and tankless heaters around 20 with regular descaling. Spending money on a heater near the end of its life buys less time.

A leaking tank

Valves, fittings, thermostats and elements can be replaced. A tank that leaks from the steel itself cannot be reliably repaired. That is why the calculator recommends replacement whenever the tank is leaking.

Repairs that are usually worth doing

Thermocouple, thermopile or igniter on a gas heater
Heating element or thermostat on an electric heater
Drain valve, relief valve or a leaking pipe fitting
Descaling a tankless heater that is running poorly

Before you decide

Get the repair and replacement quotes in writing, and ask whether the replacement quote includes permits, haul-away and code upgrades. Our water heater replacement cost guide shows typical 2026 prices.

Common questions

Is it worth repairing a 10 year old water heater?

A small repair, such as a thermocouple or element, can still be worth it. A major repair on a 10 year old tank is usually money better spent on a new heater.

How do I know how old my water heater is?

Check the rating label for a manufacture date. If there is none, the serial number usually encodes the year and month.

Repair or replace your water heater? Calculator