How to Replace a Temperature & Pressure Relief Valve
The temperature and pressure relief valve found on a gas or electric water heater is a crucial component to the unit. The valve, commonly referred to as the T & P relief valve, is the primary component that releases pressure within the water heater tank. As water begins to heat, it expands, creating pressure within the tank. Increased pressure buildup can cause serious damage to the tank and your home. When the valve becomes damaged or begins to leak, its imperative to replace the valve immediately to avoid the pressure buildup. Does this Spark an idea?
Things You'll Need
- Bucket
- Pipe wrench
- Joint compound
- Replacement temperature and pressure relief valve
Instructions
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1
Turn the heater off by disconnecting the power cord if the heater is electric. If the heater is gas, turn the thermostat all the way down.
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2
Turn a faucet on within the house to allow the hot water to bleed from the system, and continue to bleed the unit until the water turns cool. Turn the faucet off. This will prevent potential burns.
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3
Turn the cold water pipe to "off" to ensure the water supply going to the water heater is off. If you are unsure where to turn the cold water pipe off, locate the lever on the pipe and switch it to "off."
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4
Place a bucket under the overflow pipe and raise the lever on the pressure relief valve to release a bit of water pressure from the tank. Water will begin to flow out of the overflow pipe. Continue to release the pressure until the water stops flowing. Close the T and P relief valve by pressing it down into place.
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5
Remove the overflow pipe from the T and P relief valve by unscrewing the pipe with a pipe wrench.
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Remove the pressure relief valve by turning it counterclockwise with a large pipe wrench. Extreme force may be required to remove the valve if the valve is severely damaged or old.
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7
Prepare the new pressure relief valve using joint compound. Apply the joint compound to the threads of the valve. Push the threaded end of the valve into the heater and turn the valve clockwise until it's completely screwed into place. Screw the overflow pipe back into place.
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Restore power to the water heater by plugging the unit back into the electrical outlet or turning the thermostat back to the desired temperature. The water heater is now ready for use once again.
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Tips & Warnings
To avoid potential burns, wear gloves and goggles while replacing the T and P valve.
References
- Photo Credit faucet image by Laura Dynan from Fotolia.com
