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The temp./pressure valve on top of the heater is leaking. what is the cause and solution.

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It is possile that it had apressure fluction for various reasons. It's also possible that valve spring is just getting weak. What i would do first is replace T&P valve and see what happens.These are common 3/4 inch male iron pipe t&p valve available at most hardware stores. First shut off water supply to water heater, then open valve on hot water side of nearest faucet to relieve pressure. Remove old valve by turning counterclockwise. You may need a pipe wrench as they can be pretty tight. Remove old t&p valve and use teflon pipe tape or joint compound on new valve threads. Install new valve and tighten securely. Close faucet previously opened to relieve pressure,then turn water supply valve to water heater. Check for leaks and tighten further if needed. Check valve occasionally for next couple days. If no further leaks from valve then your're in business. Hope this helps. Thanks

Posted on Nov 11, 2010

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Natural gas water heater pop off valve leaking even after replacement


This is unusual. The first thing to ask is what is the water pressure reading at your location? It could be too high. That would cause the valve to be close to opening and leak. The second could be something to do with the thread area that the valve screws into. What is the age of the heater and has it ever been dropped or damaged? Third is how hot is the water temp?

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Hot water pressure relief valves serve two functions. The first is to remove high-pressure water from the hot water tank. The second function is to act as a high temperature valve to remove water that exceeds a predetermined point for the valve. Both of these relief settings are preset at the valve factory. Many pressure relief valves will come with a metal tag that identifies these release points. If you're attempting to remove the hot water heater pressure relief valve, pay careful attention to ensure that you replace with the correct valve.

Your hot water heater has a pressure relief valve safety mechanism. When pressure inside the water tank exceeds certain limitations, the valve opens up to allow the pressure to be released. A faulty pressure relief valve will not release excess pressure, which could cause extensive damage to your home. You should test the hot water heater pressure relief valve once every six months to ensure proper operation. If the pressure relief valve fails the test, replace the valve with a new one immediately

Locate the pressure relief valve on your hot water heater. The pressure relief valve has a lever handle on top with a drain pipe attached to it. The pressure relief valve is most often on the side of the water tank toward the top. Newer models of hot water heaters have the pressure relief valve on top of the water tank.

  • Inspect the area around the pressure relief valve for signs of leaking water. If there is leaking water near the relief valve connection, replace the relief valve. If no leaking is evident, proceed with testing the pressure valve.

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    Examine the area below the pressure relief valve drain pipe. Most water heater closets either have a drain in the floor below the pipe or the pipe is inserted into another pipe to direct the water out of the home. If the end of your drain pipe is not in another pipe or there is no drain in the floor, place a bucket under the drain pipe to catch water when you test the pressure relief valve.

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    Pull the lever handle on the top of the pressure relief valve up with your fingers. A working lever will lift up without difficulty.You should begin to hear water going through the drain pipe. Slowly release the lever to shut off the pressure relief valve. The pressure relief valve is good. If you did not hear water running through the drain pipe, lower the lever on the pressure relief valve and replace the valve. If the lever is difficult to raise, do not force the lever. Replace the pressure relief valve.


  • Now with all that said if you have a closed loop water supply system and you have a pressure vessal/expantion tank it may have gone bad and is making the TP valve leak. you can call your water provider to see if you have closed loop system.

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