A tank leak only gets worse and can release dozens of gallons. Shut the heater down now; a small fitting drip is less urgent but should still be fixed soon.
Call (866) 417-0220Emergency, or can it wait?
Call right away if…
- Water coming from the tank itself
- Continuous discharge from the relief valve
- Leak in an attic or above finished space
Usually OK to schedule if…
- Slow drip from a fitting with the heater shut down
- Condensation that stops once the heater is warm
Signs of water heater leaking
What causes it
Tank corrosion
Once the anode is depleted, the steel tank corrodes and eventually leaks. This is not repairable.
Relief valve discharge
The temperature and pressure relief valve opens when pressure or temperature is too high, or leaks when the valve itself is worn.
Loose or corroded connections
Supply connectors, nipples and fittings on top of the tank can drip.
Drain valve leak
Plastic drain valves can leak at the seat or threads.
Condensation
Gas heaters can form condensation on startup, which can look like a small leak.
What you can check yourself
- Dry the area and watch where new water appears
- Check the top connections and the relief valve outlet
- Look for rust streaks on the tank jacket
- Note the heater’s age from the serial number
What happens when a plumber arrives
- Locate the exact source of the water.
- Test the relief valve and measure system pressure.
- Check for thermal expansion and a missing expansion tank.
- Inspect the tank and anode condition.
Repair options
| Option | When it’s used |
|---|---|
| Fitting or connector repair | Leaks at top connections |
| Relief valve replacement | Valve weeps at normal pressure |
| Pressure regulator or expansion tank | Relief valve opens from high pressure |
| Drain valve replacement | Leak at the drain valve |
| Water heater replacement | Tank body is leaking |
Water Heater Leaking: questions homeowners ask
Can a leaking water heater be repaired?
If the leak is from a fitting, valve or connector, usually yes. If water is coming from the tank itself, the heater must be replaced.
Is it safe to use a leaking water heater?
It’s safest to shut it down until the source is found. A tank leak can worsen suddenly, and leaks near gas burners or electrical parts are a hazard.
Why is water coming out of the pipe on the side of my water heater?
That’s the relief valve discharge. It may be releasing excess pressure or temperature, or the valve may be faulty. Don’t cap it — have it checked.
How do I drain a leaking water heater?
Turn off power or gas and the cold inlet, attach a hose to the drain valve, open a hot faucet to let air in, and drain to a floor drain or outside. The water may be scalding.
How long do water heaters last before leaking?
Many tank heaters last roughly 8 to 12 years. Hard water, high pressure and skipped maintenance shorten that.
Does homeowners insurance cover a leaking water heater?
Policies often cover sudden water damage but not the failed heater itself. Check your policy and photograph damage.
