Water Heater Pressure Relief Valve


A water heater pressure relief valve is critical control feature to insure against over temperature and pressure in your water heater, they release excess pressure build up from within the tank in the even of too much hot water. Is a huge security measure in the event that the relief valve fails, if it does fail you should not to use it until I has been replaced with the right substitution, by no means you ought to have the valve supplanted with any different specs to your previous TP valve unless the manufacture has given full approval.

TIP! TP valve Should be replaced once a year

The TP Relief Valve is replaced at the top section on the water heater and ought to have the temperature probe pointing down around 6 inches into the water. Inability to correctly install will leave a very dangerous water heater if you’re not comfortable with this then you should let a professional handle the installation and replacement.

This is why safety should be taken care the dealing and maintaining a water heater and why it’s so important to have a working TP valve.

Testing the Pressure Relief Valves

There are a few basic tests to perform to confirm that your pressure relief valves is faulty. You can test to see if there is any heat coming from the overflow pipe the pipe should cool if it is warm then this is one sign of a faulty water heater relief valve . Check the valve itself and this should be warm and this is normal if you have a water heater pressure relief valve leaking then this is a clear sign that it will need to be replaced urgently.
the second test you will need to open the TP valve be careful as water will be released from it and it can be very HOT! once you open it and there is no water then this is a sure sign of a faulty water heater relief valve valve and you will need maintenance very urgently.


Before starting any work as you know from following my other articles i always recommend the following safety procedures. Turn off all your electric to the water heater,turn your water supply off and also your gas supply .water heater pressure relief valve

Water Heater Relief Valve Replacement

Follow the below steps to replace your leaking pressure relief valve,

  1. Drain the water tank it should be below the TP level you can do this by opening your tape just to release the pressure and reduce the water from within the tank.
  2. Remove the discharge tube that is connected to the valve it usually extended to about 6 inches from the floor.
  3. Open the TP Lever usually upwards this will reduce pressure, if you have an older copper pipe attached to it you will need to unscrew the pipe. Turning it counter-clockwise to loosen it slowly water could start to come out at this point tighten it back up and remove more water via opening the tap in the sink or bath.
  4. Once removed you can then use pipe-thread tape or joint compound on the threads of the new Pressure Relief Valve and screw it into its location and use a wrench  to insure it is tight. The outlet needs to be facing the overflow drain pipe.
  5. Close your running tape if it is still open and you can then turn on your mains water supply, electric and gas relight the pilot light

Once all has been completed you can heat the water and for safety perform another water heater pressure relief valve test.

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