pressure 80 psi

coreground · Oct 8, 2007

As measure at hot water heater and external faucet. Is this too much ? Can I adjust this or do I need to contact the city ?

I have a leak out of the water heater PRV. This was after I tested and unclogged the drain line.

I also have pipe movement after the toilet refills.

Cwhyu2 · Oct 8, 2007

80 psi is alittle high should be 60 psi to get long life from your fixtures.You must t&p valve PRV is or should be on the main
with expanion tank on inlet side of w/h.

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hj · Oct 8, 2007

psi

I set PRV's to 75 psi, and do not worry if the raw pressure is 80-85 psi.

Jimbo · Oct 9, 2007

Most PRV models I am familiar with have a range of 25 to 75, meaning if you are seeing over 75, the PRV is defective. You are right on the cusp. you could try to adjust it down and see if it holds a lower pressure. 80 is the top end of allowed pressure. Not something to lose sleep over, but if your PRV is not working, then you are exposed to possible higher pressures at night from the street.

Bob NH · Oct 9, 2007

coreground said:
I have a leak out of the water heater PRV. This was after I tested and unclogged the drain line.

I think we may have a problem with definition of the problem. People are answering the questions relative to a Pressure Reducing Valve. The thing that coreground is referring to is almost certainly a Temperature/Pressure Relief Valve. Those are usually set to relieve at 150 psi or temperature around 200 degrees F.

Jimbo · Oct 9, 2007

Thank you, bobnh, for taking a more thorough look at the original post. I, and others, apparently only read the first sentence, relative to his house pressure, and a PRV.

The second and third paragraphs are two more separate problems. They may, or may not, be all related to a pressure issue.

Now we need coreground to give us a few more details.

coreground · Oct 9, 2007

Yes, Temperature/Pressure Relief Valve on a Bradford White model MI5036LN10. Two connected in series. ( the second w/h from the cold input has the leaking relief valve).

Bob NH said:
I think we may have a problem with definition of the problem. People are answering the questions relative to a Pressure Reducing Valve. The thing that coreground is referring to is almost certainly a Temperature/Pressure Relief Valve. Those are usually set to relieve at 150 psi or temperature around 200 degrees F.

Jadnashua · Oct 9, 2007

The valves do get old, so maybe if you are lucky, all you need to do is replace it. But, if the house has a check valve or a PRV, then it needs an expansion tank. Buy a pressure gauge if you don't have one. After taking a long shower or bath, check the pressure again. The refilling of the WH with cold water, and the expansion, may cause the pressure to peak quite a bit higher than that nominal 80#; enough to trip the T&P valve.

pressure 80 psi

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