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The water wouldn’t have anywhere to go. As the water heater heats the water, it expands, which builds up pressure in what is now essentially a closed system. When the pressure builds up enough, the T&P relief valve on the water heater just does it’s job and relieves the excess pressure by leaking a little water.
Water heater is ~9 yrs old. I see there is a drain discharge pipe installed going to outside, which I tested, working fine. House water pressure measured at an outside spigot around ~60-70PSI. I can stop the valve from leaking for a few days by releasing the water from the drain pipe by opening the bottom ball valve that's located below the PRV.
There are three reasons a T&P valve opens. Temperature, pressure, or a faulty valve. Temperature. If the water in the heater reaches a temperature of 210 degrees F, the T&P valve will open and release water until the water temperature is reduced. As water is removed through the T&P valve, cold water enters through the inlet and mixes with the ...
This excess pressure is absorbed by the expansion tank so the final pressure of the hot boiler may go up to 15-20 PSI typically, which is below the usual 30 PSI setpoint of the pressure relief valve. Some regulators include a backflow preventer and some use a separate backflow preventer that is installed between the regulator and the boiler.
I just finished replacing the pressure relief valve on my Rinnai hot water heater. Everything went well, I turned on the cold input and wham, water just started gushing out of the relief valve. All the specs line up on the valves (150 PSI), in fact the new one has a higher BTU/HR rating by a long shot (500,000 old vs 934,000 new). I have to ask ...
Installed a new pressure release valve on electric water heater because old valve was dripping water on floor. New valve also dripping water. Any ideas? Suggestions? Water temp set at 110F, so it's not because of excess heat. Water pressure regulator on incoming water main set at 50 lbs. I'm out of ideas as to what could cause valve to seep water.
Turn off the heater, turn off the cold water inlet. Open a hot water tap/faucet upstairs/above. Drain water from the tank till no more water comes out of the pressure valve. Tank should be drained a bit every month or two also to remove sediment. Replace the valve. Turn on cold water inlet and leave the hot water tap open till no more air comes ...
1- open the valve while the HW tank is under pressure to try to flush the valve out. NOTE, plenty of water will come out! be prepared to catch it in a bucket. (This rarely works to cure the leaking valve, but you can take a shot) 2- buy an new valve and install it. ( This has a very high success rate )
This is an electric heater. The original heater was taken out because it rusted out. Does anyone have any idea why the relief valve leaks when the water get hot. Its happened now on two new GSW6 water heaters. Maybe there is an adjustment on the the relief valve that I can do or something but its not normal for it to happen on two brand new ...
An expansion tank may be code in your area; it is in mine. Water expands when heated and can cause the relief valve to lift (drip/leak) when the cooler water in the tank is reheated after you have used some hot water. You used to be able to buy temperature/pressure relief valves rated at either 125 or 150 psi. I always preferred the relief ...