"Bob Wheatley" wrote in message
...
"eastcoastguyz" wrote

Does an expansion tank sound like the solution?


Yes, with the PRV installed you need an expansion tank.
I'd also recommend a check valve on the cold water inlet of the water
heater to eliminate the cold system as part of the expansion area and to
ensure there's no backflow from the heater into the cold system.



Bob Wheatley


The public water system pressure in my area is always changing up and down
several PSI day and night. I installed an new water heater a couple of years
ago and found that an Xtrol type expansion tank for potable water was
necessary to keep the water heater's pressure relief valve from popping
every so often. I had tried another relief valve first, but the tank was
necessary to absorb the pressure spikes.
"Funny" thing is my water meter (in my basement) can be observed oscillating
forwards and reverse if you look at the spinner dial on it top while you
hear the meters chamber measuring the volume flow while this is happening.
What is NOT so funny is that the actual dials on the meter seem not to go
backwards (the 1/10 cu ft dial) when the spinner is in reverse. I don't
think it adds up to any real dollar amount to my bill. But the frequent
meter noise is annoying.

Funny how this thread came up as I was considering installing a check valve
in the cold water feed to my hot water tank!

I will put one in for sure now.

Bob (another Bob)