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Hot water system keeps going over the relief valve, Have changed it twice and still does it?

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Check the hot water temperature setting, maybe its too high! or raise the psi relief valve by buying a higher setting! Thank-you-very- much!

Posted on Aug 27, 2008

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Posted on Jan 02, 2017

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My pressure relief valve keeps blowing more so when it is hot any ideas please


Pressure relief valves open on high temperature as well as high pressure. They do go bad and are replaceable.

Consider calling the plumber. It is not very expensive part and the plumber can change it quickly.

If you just want to do it yourself:
  1. Write down the make and model of the water heater.
  2. Go to a real plumbing store and buy a new one.
  3. Turn off the heat source (the gas or electricity)
  4. Turn off the water inlet and open a hot water valve at any sink to take the pressure off the heater.
  5. Remove the old relief valve. It may take a long handled wrench.
  6. Install the new pressure relief.
  7. Close the sink valve.
  8. Turn on the water and check for leaks.
  9. Turn on the heat source.

Good luck.

Apr 11, 2015 | Water Heaters

1 Answer

Pressure relief valve intermittent noise


check your water pressure and then make sure it is not to high or all the problems you have had were not the answer. it is a pressure /temperature valve not just . temp.

Apr 06, 2014 | RHEEM 40 GAL ELEC Water Heater 6YR SC...

1 Answer

Relief valve buzzing noise


Add an extrol expansion tank to the piping. You can get one for about thirty dollars from the hardware store.

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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

    Just purchaced a 99 jamboree with an atwood G6a-8e water heater. while on a trip I lit the water heater, and after 30 minutes someone told me water was leaking from the side. I noticed the pressure relief...


    It's gas operation only, but has electronic ignition for propane. ( just to confirm, if you look at back of water heater, it would have a metal or black plastic cover and hydro cable going in side or top of it.)
    There are usually 3 things that may cause pressure relief to leak. 1) Faulty,corroded pressure relief valve, which usually needs to be replaced if it goes faulty. 2) water temperature is getting too hot, which could indicate a faulty thermostat. 3) If your hooked up to city water, the pressure may be too high, causing excess pressure build up in hot water tank, thus pressure relief opens. If your running off your on board pump, this is probably not the cause, as they are usually set at 40 psi.
    Ist, - try pulling lever on relief valve slightly open ( careful it's hot !!) to clean out any calcium that may be logged on seal thus causing leak. If that doesn't do it, and the hot water isn't running out steady and appear to be under extreme pressure while leaking, then I'd change the pressure relief valve. Remember when you do, shut off water to system, and relieve pressure by opening a tap, and pressure relief as well after that. New one shouldn't be too expensive, just make sure you get same thread, 1/2"NPT or 3/4"NPT. Use a little teflon tape, or pipe dope whatever you prefer when re-installing as well as clean threads a little before.
    If it really starts gushing out pressure relief when heating or heated, and water seems hotter than normal, it's more than likely a faulty thermostat. I'll wait for your reply on what condition your experiencing before I go in to how to change the thermostat.

    Nov 17, 2010 | RTO Atwood Water Heater - 6 Gal LP

    1 Answer

    Rheen water tank does not work


    Hi,
    Turn the water off and replace the relief valve...
    If there is that much water running out of it the hot water hweater cannot keep up...
    Replace the relief valve and then you will have hot water..

    heatman101

    Apr 17, 2010 | Rheem 81VP6S/430126 Water Heater

    1 Answer

    Pressure relief valve


    The pressure relief valve only leaks when there is excess pressure in the system, possible causes could be excessive static pressure, overheating, faulty pressure vessel or undersized pressure vessel.

    Apr 11, 2010 | Rheem 50 Gallon FVR NATGAS Water Heater...

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    Drain pipe from hot water heater leaking on the outside of home ? cause


    Water may be coming from the temperature- pressure (TP) relief valve, which releases water when it senses excess pressure. Excess pressure can be caused by the temperature being set too high, by the main water supply pressure to your house being too strong, or by special valves that reduce water pressure in your water supply system not allowing for hot water expansion in the tank. Or, the TP relief valve itself may be faulty. 20090617111024_hot-water-heater-leaks.gifIf you find the leak is coming from your TP relief valve, consult your owner’s manual for instructions on what to do, or contact an appliance repairperson immediately—if too much pressure builds up, your tank could explode. So, adjust temperature to about 120 deg F , if problem persists, change TP valve.

    Mar 25, 2010 | Heating & Cooling

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    Leaking pressure relief valve


    what is the water pressure on the cold side? You may need to install a pressure reducing valve at the water heater inlet to reduce inlet pressure and keep pop off valve from opening when not needed.

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    Gravity feed boiler/ american standard model#g27dpgc


    your make up water pressure is greater than the safety relief pressure. The safety should be 30psi lift. the makup usually goes through a regulator called an automatic makeup valve. these valves operate infrequently on a closed system and get rusty. They stick. If yours is stuck open, then your makeup water pressure which is probably greater than 30psi is overpressuring your boiler.

    Nov 11, 2007 | Heating & Cooling

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