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Old 01-01-2011, 10:59 PM   #1
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Help! Water Heater Pressure Relief Valve leaking


I recently hooked up to city water and the utility company told me I probably needed to put a pressure regulator on, which I did. My water heater is in the garage and have been noticing water on the floor. It is coming from my PRV, so I replaced it and it still leaks. Will I have to install a expansion tank now? Do I need a pressure regulator if I install an expansion tank? My water pressure is between 50 and 55 psi the last time I checked. I wish it was higher because my pressure in the showers are not that great. I'm just afraid it may blow a joint loose in the wall somewhere. I did have a line blow off under my bathroom vanity 2 days ago. It was the gray plastic line with the plastic ferrel. I replaced them with the braided ones. Please advise!

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Old 01-02-2011, 07:13 AM   #2
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Help! Water Heater Pressure Relief Valve leaking


I would get rid of all those gray(polybutylene) riser tubes, They are a problem waiting to happen. 60-70PSI is normal for a house in our area, so 50-55 should not be a problem. Check the pressure on the hot side. It is possible the heater is set too hot, another bad releif valve, etc. Have you flushed the heater recently?? It should be flushed 2-3 times/year to get rid of buildups at the bottom of the tank. If the heater is old, 8yrs+, and has never been flushed, now is not the time to do it. That can cause problems.

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Old 01-02-2011, 08:40 AM   #3
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Help! Water Heater Pressure Relief Valve leaking


Even with a pressure regulator you need an expansion tank at the water heater. The problem is the water company has a check valve on the incoming service, when you heat the water it expands and has no place to go. The pressure rises and the T/P valve does its job and lets off the pressure. The expansion tank gives the expanded water a place to go and controls any excess pressure.
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Old 01-02-2011, 10:10 AM   #4
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Help! Water Heater Pressure Relief Valve leaking


If I add a shut off valve, should it be before or after the expansion tank? Does it even matter?

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Old 01-02-2011, 12:30 PM   #5
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Help! Water Heater Pressure Relief Valve leaking


Put your exp tank on the cold inlet to the WH. The tank should be between the WH shut off valve and the heater. WATTS has a nice little video on setting the precharge on a new tank as well as some other useful videos- http://www.watts.com/mediaCenter/

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