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I have a Rheem electric water heater, M/N 71-40D B. What is the "cavity size" for a new T&P relief valve?

T&P relief valve cavity size?

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Gene Haynes

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James Chandler

  • 686 Answers

SOURCE: Relief valve constantly releasing water.

lower your thermostats a bit. If your temperature is set to the hottest setting, then chances are no relief valve will do

Posted on Jan 08, 2009



  • 63 Answers

SOURCE: A.O.Smith water heater relief valve letting out water

You just need a new pop off valve $10-$15 dollars. Unscrew the old one on top of the heater, put some teflon tape on the new one and screw it in place. Being that the house is for sale I would probably have a licensed plumber do it just to protect my self from any liability. Also most state codes require that pipe to terminate in a floor drain, most home inspectors will catch that. If it doesn't I would have him do that also.

Hope this helps-please rate

Posted on Mar 17, 2009


  • 40 Answers

SOURCE: 40 gallon rheem electric hotwaterheater, amps to

ha ha ah

Posted on Oct 30, 2009


Sean Lavelle

  • 21 Answers

SOURCE: Too much water draining from Vulcan Electric H/W relief valve.

Dear Julie. Do you have an expansion tank installed? If so it is probably waterlogged. If you come home shower etc. use lots hot water then go to bed or leave the cold water in your tank heats and expands as it heats. In the old days a toilet ballcock valve would relieve this pressure but modern toilets with diaphragm valves wont so the pt valve relieves pressure. Installing an expansion tank on the cold water line near the heater will absorb the extra water & stop the pt valve from activating.

Posted on Jan 25, 2010

Brandon Roberts

  • 17 Answers

SOURCE: relief valve on rheem 41v40 s-40f leaks

Relief (pop-off) valves can be replaced. Make sure to get the right one. They unscrew from the unit. They are generally screwed in very tight, you may have to get a good size wrench or pipe wrench to loosen it; especially if it is more than a few years old.

Posted on Mar 19, 2010

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1 Answer

Changed filter as I have a few times, it is now slow leak from pressure relief valve. How can I fix it?

activate the pressure relief valve a few times to see it will seat better or replace the pressure relief valve

May 21, 2015 | Water Heaters

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Water dripping from blowpipe

It is normal for water to drip out sometimes from the pressure relief valve outlet pipe. If it drips continuously then open and shut the pressure relief valve several times so the pressure relief valve shuts off properly.
If this does not fix the dripping problem then the pressure relief valve is faulty and needs to be replaced.

Apr 02, 2013 | Water Heaters

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What is the cavity size for the relief valve that I need Model 22V50F1

TP valves screw into 3/4" opening.
End of probe MUST extend into upper part of tank, and cannot be located on pipe away from main body of heated water.

If you need further help, I’m available over the phone at

Nov 10, 2012 | Rheem Water Heater Pressure Relief Valve

1 Answer

I have a 21v407 Rheem water heater that is leaking from the top relief valve. The leak i believe, is from under the valve. what is this problem. and how do u drain this thing?

Shut off the water supply valve over the heater. Shut off the electric or gas to the heater.
If you have any house or basement water valves below the level of the heater, open them and open a valve that is higher to vent it.
If necessary, open the drain at the bottom of the heater and using hose or buckets, lower the level below the relief/thermostatic valve. Be careful, the water is hot and softens even heavy hoses.
Once the water level is down, unthread the downtube (if there is one) from the discharge of the relief valve, unthread the relief valve from the heater and either dope/tape the threads or replace the relief valve.

Write back with any questions.

Sep 09, 2011 | Rheem Water Heaters

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

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    My relief valve slowly drips when my boiler runs, fills up a 5 gallon bucket in a day, when it runs alot. this is new ,

    Is the pressure in the boiler higher than the set pressure of the relief valve? If it is, there is a problem that the relief valve is trying to correct.
    If not, did you try making the valve open?
    Be careful, but step back, lift the lever and briefly let the relief valve discharge into a bucket of some sort, maybe you could put some old rags in it to keep from spraying out at you. If there is sediment in the valve this may flush it out.

    Dec 06, 2010 | Watts 3/4 Pressure Relief Valve

    1 Answer

    Relief valve on rheem 41v40 s-40f leaks

    Relief (pop-off) valves can be replaced. Make sure to get the right one. They unscrew from the unit. They are generally screwed in very tight, you may have to get a good size wrench or pipe wrench to loosen it; especially if it is more than a few years old.

    Mar 18, 2010 | Rheem 40 Gallon FVR NATGAS Low WATER...

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    Boiler leak

    Hi, it appears you have a defected relief valve. you can try one solution. lift the handle on the relief valve and let some water out. sometimes that can flush out materials thats blocking the stem in the valve. if it's still leaking it must be replace.

    If this doesn’t work for you please write back. Thanks,

    Nov 23, 2008 | Watts 3/4 Pressure Relief Valve

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