Repair or replace your water heater?
Quick answer: Repair is the right path when a specific part has failed, the tank itself is sound, and the unit is not at the end of its expected life. Replacement is the clearer path when the tank is leaking, the heater is in or past a typical lifespan and already needing repeat repairs, or you want a different type (tankless, heat pump, or a fuel change) rather than another patch on the same unit.
This is a decision guide, not a diagnosis of your house. If water is actively spreading, start with what to do if the heater is leaking, then come back here.
How long these units usually last
Lifespan is a range, not a warranty.
- Conventional storage tanks (gas or electric) commonly last on the order of 10–15 years, with moderately hard water, skipped flushes, and a spent anode shortening the short end of that range.
- Gas tankless units: ENERGY STAR cites a 20-year life expectancy, assuming the heat exchanger is descaled as the manufacturer requires.
- Heat pump (hybrid) tanks are still storage tanks with extra machinery; treat them closer to a well-maintained electric tank for planning, and follow the specific model’s guidance.
Sources: ENERGY STAR; Fairfax Water (typically 5–10 grains per gallon), retrieved 2026-11-13.
The rating plate on the unit usually has a serial number that encodes the date of manufacture. A clear photo of that plate is one of the most useful things you can send with a quote request.
When a repair is often enough
These problems are frequently a part, not a new heater:
- No hot water on a gas tank, with a failed thermocouple, gas control, or igniter, and no leak
- No hot water on an electric tank, with a failed element or thermostat, and no leak
- Water leaking at a fitting, drain valve, or inlet/outlet connection — not from the tank shell
- A dripping TPR valve, which can be a bad valve, a thermostat set too high, or high house pressure (sometimes an expansion-tank issue on a closed system), not automatically a new tank
- Rumbling or popping from sediment, on a tank that is otherwise sound and not near the end of its life — a flush may help; it will not fix a tank that has already started to rust through
When replacement is usually the honest recommendation
- Water at the base of the tank that is coming from the tank itself (corrosion). That leak is not a patch job.
- Rusty hot water when the cold water is clear, especially on an older tank
- Repeated repairs on a unit already in the 10–15-year window
- A tankless unit that is scaled beyond economical recovery, or that needs a heat-exchanger replacement that approaches the cost of a new unit
- You want a different type or fuel (tank to tankless, electric to heat pump) rather than another cycle of the same equipment
Typical regional ranges for a new installation live on the cost guide. Your quote should be itemized either way.
Send a description and photosSigns that get more attention than they need — and signs that do not get enough
- A little noise is common as a tank heats. Loud, regular banging is worth an inspection, not a panic.
- A small drip at a valve is worth a same-week look; it is not always an emergency, but it is not something to ignore for months.
- A wet tank base, a spreading pool, or a ceiling stain under a closet is time to shut the water off and treat it as urgent. Emergency steps.
FAQ
Can a leaking water heater be repaired?
Sometimes, if the leak is at a fitting, drain valve, or TPR valve. A leak from the tank shell itself usually means replacement.
Should I replace a 12-year-old tank that still works?
Not automatically. If it is working, not leaking, and you are not remodeling, many homeowners run it to a clear failure or to a planned replacement they can schedule. If you are already opening the utility area, or if you want a heat pump or tankless upgrade, planning the swap before an unplanned leak is reasonable.