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PRV or Expansion Tank?

D107
D107 Member Posts: 1,906
in THE MAIN WALL
If 60 lbs is average do they have to be rated far higher than that to deal with temp increases? Water co. swears they keep pressure at 55-60 lbs but in last three weeks we've had three relief valve releases. (I wasn't there but I'm assuming it's the indirect RV) Our oil co says this time of the year--when all the lawn sprinklers are switched off, usage declines and pressure increases, they get alot of complaints. Pressure regulation in the area is centralized only. I'd assume local pressure fluctuations are possible.

Perhaps a PRV AND expansion tank?

Thanks,

David

Comments

  • Frank_44
    Frank_44 Member Posts: 4
    Dripping HW Heater

    My HW heater is dripping from the T&P valve. I have a 1 inch supply from the meter which has a backflow preventer. Should I install an expansion tank or a regulator? I have surveyed the neighborhood (Washington DC) and at least 7 folks are experiencing the same problem. One of them has a gage installed at the main and it reads 70 psi.
  • ScottMP
    ScottMP Member Posts: 5,883
    Frank

    with a backflow preventer on the main you need an expansion
    tank. When the water heater heats up there is no place for the expansion to go.

    Scott

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  • Big Ed
    Big Ed Member Posts: 1,117
    you need.....

    .......both
  • Frank Borris
    Frank Borris Member Posts: 2
    Expansion Tank did the trick

    Thanks everyone. I installed a ProFlo PFT 12, set the charge to 70psi and the problem is solved.
This discussion has been closed.

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