I went on a service call today where the lady said her gas water heater tp
valve would open up occasionly and let water out (at least once per day).
She has her temp set fairley low. Of course it didn't do it while I was
there. The house is in a new area where the water preasure might be high
until more homes are built? My experience in the past is they either leak
all the time or not at all on a gas water heater. What do I need to look for
You'll have to put a pressure gauge on the drain cock to see
what's going on.
It may be that service pressure goes way up at off-hours.
My guess is you will need to install a pressure reducing valve
AND a thermal expansion tank.
I have a relatively new (1 yr old) Gas water heater, and it does the
same thing. The old one NEVER did it, and nothing has changed about the
plumbing... and I don't have the water as hot as it was in the old one.
It was take out the old one, and put in the new one. I believe I have a
defective relief valve... but haven't taken the time to replace it. It
usually flows a little after I have used the Hot water for a while. I
tried to get the folks back who installed it like a month later, but
they had gone out of business <sigh>
1. Test the water pressure if below 70 PSI then you don't need a
2. Replace the T&P valve either stay with the std 150 deg or look at the
3. Expansion chamber is a next step.. make sure you have a backflow
device on the water line coming to the house.
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