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Old 06-23-2013, 01:05 PM   #1
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Pressure release valve problem on hot water tank


Please excuse the probably dumb nature of this question

We installed a new pressure release valve on our hotwater tank and soon as we turn on the hot water, water starts spewing out the valve. The tank is full but I have no experience with this small tank connected above the tank. Is this our problem? Can someone please explain what the purpose of this tank happens to be?

Much thanks in advance

Rick
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Old 06-23-2013, 01:48 PM   #2
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Pressure release valve problem on hot water tank


The small tank is an expansion tank. As water is heated it expands. The tank provides a place for the water to go. As far as the valve is concerned, have you tried flipping it open and closed again? It's that silver lever on top of the valve. Also the valve needs to be piped so if it goes off, the water drains down to the floor.

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Old 06-23-2013, 02:06 PM   #3
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Pressure release valve problem on hot water tank


An exp. tank absorbs the pressure caused by heating water on a closed system.
Check the pre-charge pressure on the exp tank. It should be set at the same pressure as your water system (check it at a hos bib).

But I don't think your problem is the exp. tank. What is the rating on your new T&P valve?
The T&P valve should also be piped down to a safe discharge point- not left at the top of the tank- for safety reasons
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Old 06-23-2013, 02:09 PM   #4
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Pressure release valve problem on hot water tank


Thanks for the response.

We did flip the valve open and closed and no fix there. And we just havent attached the piping yet.

The small tank has writing on the side indicating that it is under pressure. It seems that that could be the problem. Maybe the HWT isnt designed to accept that extra pressure, because as soon as we turn on the hot water to the tank it starts coming out of the pressure release valve.

Is there a way to depressurize that tank or I guess we could just remove it alltogether.

Any suggestions greatly appreciated. The cold showers are getting out of hand LOL
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Old 06-23-2013, 02:16 PM   #5
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Pressure release valve problem on hot water tank


OK, we fully depressurized the tank, and then turned the hot water on slightly. Water begins to immediately come out of the pressure release valve. LOL now what?
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Old 06-23-2013, 02:19 PM   #6
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Pressure release valve problem on hot water tank


The expansion tank would not cause the problem. Can you post a closer picture of the pressure valve and also list the pressure and temp specs that should be on the valve. It's possible you got a bad valve.
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Old 06-23-2013, 02:20 PM   #7
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Pressure release valve problem on hot water tank


Quote:
Originally Posted by handyman4172 View Post
OK, we fully depressurized the tank, and then turned the hot water on slightly. Water begins to immediately come out of the pressure release valve. LOL now what?
replace the valve again.
I mentioned earlier that the exp. tank was probably not your issue. It won't affect anything until your heating water
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Old 06-23-2013, 02:27 PM   #8
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Pressure release valve problem on hot water tank


packaging says 150 psi temperature relief / 210 degrees

The close up pic of the valve won't upload for some reason.
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Old 06-23-2013, 02:29 PM   #9
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Pressure release valve problem on hot water tank


The existing PRV did this, plus the new one we just bought. I guess it COULD be that, it just seems to be unlikely. Not that we don't fully appreciate the input, just that it seems odd. But if that is the only option, we'll try that.
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Old 06-23-2013, 02:32 PM   #10
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Pressure release valve problem on hot water tank


Is the Hot water out free and clear?
Looks like the line might be crimped and thus not letting water out so the system is over pressuring thus your relief valve is popping off.
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Old 06-23-2013, 02:38 PM   #11
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Pressure release valve problem on hot water tank


To be sure. Replace the Hot Water Tank and the expansion tank. You need to ensure that everything that can be replaced is.
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Old 06-23-2013, 02:40 PM   #12
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Pressure release valve problem on hot water tank


Replacing the products may not solve the issue, but in doing so you can rule out old defective equipment

There may be excessive pressure in the system as well.
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Old 06-23-2013, 02:43 PM   #13
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Pressure release valve problem on hot water tank


OK- lets back up to the beginning here.
What led you to replacing the T&P relief valve?
Do you have a PRV also or are you using that term for the relief valve- they different valves
How old is the tank?
What is your house water pressure now?
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Old 06-23-2013, 03:45 PM   #14
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Pressure release valve problem on hot water tank


Apparently your house water pressure is excessive or you just got a bad T&P valve.

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