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The pressure release valve keeps engaging and running all of the hot water out of the tank

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If this is a water heater, replace the valve. You can get them at Home Depot. If it is an air conditioner, don't worry about it. The water is supposed to run out.

Posted on Jul 27, 2008

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How to change out copper piping from release valve


If the release valve referred to is the pressure release valve, then a water leak out the attached vent pipe is an indication that the valve is failing. To change the valve, the water must be allowed to cool (turn off AC power or gas) and the water level inside the tank must be lowered (drained) to below the level of the pressure relief valve. Once this is accomplished the vent pipe is unscrewed from the relief valve and the pressure relief valve is unscrewed from the water tank. A new pressure relief valve with a sealant on the threads, is then screwed and tightened into place with the outlet port facing downward. The vent pipe is attached to the new valve and the tank refilled with water. A hot water facet must be opened to allow air to exit while filling. Upon becoming full (water will begin to flow from facet), turn off the facet and restore AC power or gas, therefore allowing the water heater to heat up. When the first hot water is utilized there may be some air expelled from the facet.

Sep 13, 2015 | Water Water Heaters

4 Answers

Water pressure is high and over flow pipe is running


Have you measured the pressure or is it a faulty valve. Are the inlet and outlet valve open. There is a safety valve for thermal relief on top of the tank.

Mar 19, 2015 | Water Water Heaters

1 Answer

I turned up the water temp on my gas water tank, and water leaked from the side pipe..do I need to repalce the pressure release valve or is this normal?


Any time your pressure release valve goes off you should replace it. the t&p valve responds to the temperature and pressure its possible that the setting you chose was to hot, or its possible that the relief valve was just worn out. I would replace that and keep your temp setting between B and C. another possibility is thermal expansion, check and make sure your expansion tank is good and if you don't have one I highly recommend it.

Jun 28, 2014 | Bradford White M45036fbn 50 Gallon Natural...

1 Answer

Pressure releif valve leaking


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.

  • 3

    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.

  • 4

    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.

    Feb 04, 2011 | Whirlpool Water Heaters

    1 Answer

    We have a brand new rheem 40 gal elec water heater, after installation we have water leaking from the base of the relief valve, pooling up in the plastic fitting and making it way over the side all over...


    Water heater should be set in a drip pan.
    Otherwise, put 1 gallon bucket under TP release pipe to catch water.
    http://waterheatertimer.org/Water-at-bottom-of-water-heater.html#drip-pan

    When you say relief valve, I assum you are talking about brass valve located on top of tank or near top of tank. This is TP valve and a pipe connects to this valve and runs down to within 6" of bottom of tank. TP valve has a small lever on it.
    If you are talking about tank drain valve located at bottom of tank, then add a comment.
    Following information is for TP valve.

    Dripping TP valve can be caused by 3 different thing:

    1) Obstruction inside TP valve. Open TP valve for a moment to flush away particles and slowly lower lever back down. See if water stops dripping, if not, then replace TP valve

    2) Defective TP valve: replace TP valve. Turn off electricity to water heater. Let heater cool for several hours so you do not get scalded. Close shut off valve located above tank on cold side. Open tub spout to relieve pressure, open tank drain or open TP valve and empty water below TP valve level. If TP is located on top of tank, not much water has to be drained. Tank is under press when hot, so be careful. Put teflon tape on new valve and install with big pipe wrench by turning clockwise until TP valve is very tight.

    3) Overheating tank. TP valve is temperature-pressure valve. If tank water is over 150 degrees, the TP valve starts drizzling hot water to relieve tank pressure.
    Lower tank pressure two different ways:
    a) turn down thermostat
    http://waterheatertimer.org/How-to-adjust-water-heater-temperature.html
    b) install expansion tank on incoming cold water line
    http://waterheatertimer.org/Water-at-bottom-of-water-heater.html#expansion-tank

    Dec 19, 2010 | Rheem Water Heater Pressure Relief Valve

    1 Answer

    Have a GE GG40T6A gas hot water tank. Leaking really bad out of the pressure relief valve. It is a rental property, gas was off to the house (tenants moved out in the night). When the gas company turned...


    12 year old water heater is getting near the end.
    Some tanks last 20 years, but that's the exception.
    To find exact age of your brand water heater:
    http://waterheatertimer.org/pdf/WaterHeaterSerialNumberDecoder.pdf

    Leaking TP valve:
    1) Lift TP lever and gently lower back into position to see if that stops leak.
    Occasionally something gets stuck in the valve.
    2) Sometimes water heater temperature gets turned up because heater is not producing as much hot water as before, and higher temps cause TP to release pressure because of overheating.
    Dial temperature down to 120 degrees.
    http://waterheatertimer.org/How-to-adjust-water-heater-temperature.html

    3) If steps above don't fix problem, replace TP valve >> TP valves have 125 or 150 degrees rating >>> older tank shouldn't be running above 125 because higher temps cause more pressure on tank, so thermostat should be lower than 125 degrees TP rating.
    Buy replacement TP at any hardware store + a roll of teflon tape to seal pipe threads.
    Turn gas control to pilot ... this will keep pilot lit but burner will not fire.
    Let water cool, and then drain some water out of tank.
    If TP valve is on side of tank, then open drain on side of tank and drain water until it is lower than valve level. Open bathtub spigot to let air into line.
    http://waterheatertimer.org/Water-heater-will-not-drain.html
    Be careful around water that is higher than 120 degrees F >> you can get burned quickly >> apply cold water to any burn.
    Use pipe wrench and unscrew TP valve counterclock-wise.
    Install new TP and put teflon tape on threads.
    Re-fill tank completely and open tub valve on hot side until water is running >> then turn gas control back to original position.
    Do not fire up any water heater before tank is completely full of water or this could damage tank.

    To read more preventative information about water heater leaks and age problems:
    http://waterheatertimer.org/Water-at-bottom-of-water-heater.html

    Nov 24, 2010 | General Electric GE SmartWater Household...

    2 Answers

    Water leaking from the base of the tank


    If you'r really lucky you may find a leaking fitting on top of the water heater thats draining down inside the shell and out the bottom, otherwise its time to replace a rusted out water heater.
    Sorry

    Nov 08, 2010 | Rheem 40 Gallon FVR NATGAS Low WATER...

    1 Answer

    Pop off valve releasing water. House pressure between 50 and 60 lbs. Plenty of hot water, set at 135 degrees. Not a lot of water but still release water regularly.


    A build up of minerals in the water can cause this. You'll need to replace the pressure release valve. If your a DIYer it's not a nery difficult job as long as you make sure you get the exact replacement valve and take the necessary precautions to relieve tank pressure before beginning.

    Feb 22, 2010 | Rheem 40 GAL ELEC TALL Water Heater 6YR SC...

    2 Answers

    Pressure valve releases sometimes , I lose a good bit of water. When i tap the valve handle, it shuts off.


    The pressure release valve is a safety feature. If it is leaking alot, it could be that the valve needs to be replaced or it could be that the high temp. shutoff in the hot water tank is malfunctioning.

    Apr 20, 2009 | Rheem 40 GAL ELEC TALL Water Heater 6YR SC...

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