I had a Rheems 50 gallon electric water heater put in 2 weeks ago to
replace i broken one. In the last 2 weeks I have discovered that it is
leaking out the relief valve. The temperatures are set at 110, so it
shouldn't be a problem with the water being to hot. I talked with the
people who put it in for me, and they said I might need an expansion tank
put in. I wanted to ask some of your opinions, because I didn't have an
expansion tank on before. I can't understand why I would need one now. Is
it normal nowadays to have to have one of these put in? Or is there
something else I should be looking at? Any help would be appreciated!
Buy a $ 6 garden hose pressure valve at HD and attach it to an outdoor
faucet. That will give you a pressure reading when your water heater kicks
I have a pressure regulator that prevents excessive pressure from venting
into the street supply. Even at that, the pressure rises only from 50 lbs to
80 lbs in my house (street pressure is 125 lbs). No expansion tank needed.
The Happy Iconoclast www.rationality.net
Some overly conscientious type probably decided to test the relief
valve. Once they open, they never seat properly again. Try replacing
it before you do anything else, and this time don't let anybody lift the
That may be true on older valves that have never been tested for at least 2
to 5 years (depending on area and water quality). However a brand new valve
or one checked regularly, should always reseat and seal properly assuming
you aren't bordering it's pressure limits. If it doesn't reseal and you are
within it's pressure limits, then it is defintely a defect. I've been
unlucky in the last 10 tanks I installed, and 2 out of 10 valves were
defective. It happens, and really not too difficult to replace...
After 15 years, I finally have to replace the relief valve on my heating
system (electric boiler - with circulation pumps). I check it every year
before powering it up (to make sure it is not stuck or blocked), and this
year, it decided it no longer wanted to seat properly. So it has a small
leak.. No biggie, but I'll probably have to replace it before next heating
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