A water heater usually leaks from the pipe fittings on top, from the temperature and pressure relief valve, from the drain valve near the bottom, from harmless condensation, or from the tank itself after corrosion breaks through. Leaks from fittings and valves can often be repaired, while a leaking tank means it is time for a new heater.
Narrow It Down
Start by drying the outside of the tank and the floor around it with a towel. Do not touch hot pipes or the burner area. Then check back after a few minutes and see where water reappears first:
- On top or running down from the top: a fitting
- From the pipe attached to the side valve: the relief valve
- At the spigot near the bottom: the drain valve
- Directly under the center of the tank: the tank itself
Fittings and the Drain Valve
Pipe fittings can loosen or corrode where they connect. The drain valve can drip if it is worn or not fully closed. Both can usually be fixed without replacing the heater.
The Relief Valve
This valve is a safety device that opens if the tank gets too hot or the pressure gets too high. Water coming from its pipe may mean the thermostat is set high, your home’s water pressure is high, or the valve is worn. Never plug or cap it.
Condensation or a Real Leak?
A little moisture on a cold day or right after a big hot water draw can be condensation that disappears as the tank heats. A puddle that keeps growing is a real leak.
Until it is checked, close the cold-water inlet valve and turn off the gas control or breaker. If you smell gas, leave and call your gas utility or 911.
A plumber can determine whether the heater can be repaired or needs replacing. For an older unit, talking through what a new heater would involve helps you plan. Call JPR Plumbing at (833) 603-1840.