Your Water Heater's TPR Valve Leaking? Here's What to Do

The TPR valve is a critical safety component that releases water if the temperature or pressure inside the tank exceeds safe levels — without it, excessive pressure could cause the tank to explode. It's typically located on the top or side of the water heater, connected to a discharge pipe.

Excessive pressure in the tank (from a faulty pressure regulator, no expansion tank, or a thermostat set too high) is a common cause. Thermal expansion in a closed plumbing system can also raise pressure with nowhere to go. Sometimes the valve itself is faulty due to sediment buildup or corrosion, or it was installed loosely or improperly.

Assess the severity — a slow drip may be minor, while a steady flow needs immediate attention. Turn off the power or gas supply and shut off the water supply before inspecting. Check that the thermostat is set to 120°F, then test the valve by lifting its lever over a bucket — if water keeps flowing, it may need replacement. Drain some of the tank to flush sediment, and check a home's pressure regulator with a gauge to confirm pressure stays within 40-80 psi.

Buy a valve compatible with your water heater model, drain the tank partially below the valve, unscrew the old valve with a wrench, wrap the new valve's threads with plumber's tape, and screw it into place — tight but not over-tightened. Refill the tank, restore power or gas, and test the new valve by lifting the lever.

Flush the tank annually to remove sediment, install an expansion tank if you have a closed plumbing system, monitor water pressure regularly, and schedule a professional inspection each year. Call a plumber if the valve keeps leaking after replacement, you notice severe corrosion, or you're uncomfortable doing the repairs yourself.

A leaking TPR valve isn't something to ignore, but with regular maintenance and timely repairs, you can extend the life of your water heater and keep your home safe.