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Old 08-24-2008, 01:21 PM   #16
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water heater PRV valve leaking


depending on where you live, it may be OK to use CPVC for the relief line. Check with you local inspection department. If so, this makes it a lot easier to replace the T&P valve. This will come in handy if you decide to perform the recommended maintenance on your new heater. Most people don't but flushing your heater and checking the T&P annually can add years of safe operation to the life of your heater. Just plan on replacing the T&P valve at some point because if it is tested regularly it will eventually start to leak.

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Old 08-24-2008, 07:08 PM   #17
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water heater PRV valve leaking


one thing at a time here, its been 9 hours and no water anywhere, thats a record. As far as the prv line, can that be PVC?
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Old 08-24-2008, 09:53 PM   #18
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water heater PRV valve leaking


No, PVC isn't approved for that application in any code I am aware of. CPVC is rated for higher temperature and is approved in the International Plumbing Code.
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Old 08-27-2008, 05:13 AM   #19
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water heater PRV valve leaking


2days go buy and no leak. Last night a puddle on top of water heater again. I believe it is dribbling out of the PRV. My expansion tank is at 90 PSI,
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Old 08-27-2008, 06:18 PM   #20
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water heater PRV valve leaking


Have you measured the water pressure at a hose bib somewhere (like the drain valve on the bottom of your water heater)? You can get one for like $15 at big box store. This will tell you if your system water pressure is too high. You may need a pressure reducing valve on the main line entering your home. Typically, you need less than 50-60 psi.
Your water pressure entering the home may be too high for the expansion tank to handle.
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Old 09-02-2008, 07:01 AM   #21
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water heater PRV valve leaking


It is always a good idea to make sure the water pressure is not too high, but if the threaded joint at the T&P is done correctly (with pipe dope or teflon tape and tightened properly), it should not leak. Remember, the T&P valve is designed to allow wter out at pressures exceeding 150 psi. It really sounds like maybe a bad weld or fitting on the tank.

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