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Old 09-27-2010, 06:51 AM   #1
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Water pressure


Let me start by thanking all of the members. I have a tpr valve leaking on my conventional gas water heater. I replaced it and the new one still leaks. I've researched this topic here, measured the pressure and found it will spike to 120 psi intermittently.

Older home, copper plumbing, has a pressure regulator installed and no expansion tank. Don't know the age, but we've lived here 10 years. I've just recently installed new bath tub (pressure balancing type, single handle Kohler), sink faucets and a new toilet.

My question is can one of the new fixtures be defective, allowing the spikes or do I have a failing pressure regulator? Are there other tests that I can do or just change the regulator? Any recommendations for replacement make/model in a 3/4" copper line and the optimum operating pressure?

Thank you,
Mike

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Old 09-27-2010, 07:01 AM   #2
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Water pressure


You need an expansion tank.

Water expands slightly when heated and this will force some out the temp/pressure relief valve on the water heater unless there was a dripping faucet somewhere.

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Old 09-27-2010, 07:13 AM   #3
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Water pressure


Thanks for the fast response AllanJ. I know that water expands with an increase in temperature, but I haven't had any issues with my current set-up in the past 10 years. This is what has me puzzled. I forgot to mention that when initially turning on just a cold tap, I get a blast of water then it returns to normal.
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Old 09-27-2010, 08:26 AM   #4
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Water pressure


My vote is PRV.

It might have a tiny stone stuck between in the rubber or the seat allowing a slow build up, topping out at street pressure. When you turn on the tap, you release that high pressure and the PRV works again until it sits idle and allows the pressure to build up again.
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Old 09-27-2010, 08:52 AM   #5
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Are there other tests that I can do or just change the regulator? Any recommendations for replacement make/model in a 3/4" copper line and the optimum operating pressure?
Replace the PRV. Use a Watts (brand) Regulator. Pressure should not exceed 80psi. 75 is ideal.
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Old 09-27-2010, 09:13 AM   #6
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Originally Posted by LateralConcepts View Post
Replace the PRV. Use a Watts (brand) Regulator. Pressure should not exceed 80psi. 75 is ideal.
Thanks to all who answered. I was leaning toward the prv.
Would the Watts N250 be suitable?
https://www.watts.com/pages/_product...s.asp?pid=3432

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Old 09-27-2010, 11:49 AM   #7
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Water pressure


I think that one would work OK. I think that's the one I installed for my parents' lawn sprinkler system and it worked fine.
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Old 09-27-2010, 01:34 PM   #8
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This one might be better (https://www.watts.com/pages/_product...ls.asp?pid=776)

The nut on the underside (inlet side) can be removed to clean the screen.
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Old 10-04-2010, 06:33 AM   #9
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Water pressure


Just a follow up, AllanJ was correct, I needed an expansion tank.

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