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Posted by Duff2 on May 27, 2008, 3:10 pm
>On Tue, 27 May 2008 10:43:24 -0700 (PDT), Duke of Hazard
>
>>My water heater will over-pressurize and open the blow-off valve and
>>begin spilling water to the drain in the utility closet. I've tried
>>stepping down the temp. incrementally to find a position that it
>>likes, but nothing acceptable for showers will be acceptable for the
>>heater. We've since been turning off the water supply valve to keep
>>it from overflowing when we're not in need of hot water.
>>
>>I called a plumber and the guy mentioned that they keep cranking up
>>water pressure through our area to supply the folks farther out with
>>decent pressure. He was wondering if we had a pressure reducing valve
>>in the unit and I was going to check on that before I had a plumber
>>physically come out. I believe it is more a problem with excessive
>>water pressure coming to the tank because if we shut off the cold
>>water supply to the unit it will not spew water even with the
>>temperature elevated.
>
> Per home improvement show, you most likely have a one way valve in
>your supply line that is the culprit.
>
Yes, the fix is simply to install an expansion tank in the cold
water line, after the back flow valve.
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