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Indirect Water Heater and Water Pressure Issue

timccarpenter
timccarpenter Member Posts: 35
in Domestic Hot Water

I discovered recently that we have a water pressure (too high) in our house. We were getting hammering when turning water on/off. I pressure gauge read 120 PSI. Part of the issue was the PRV at the water service entering the house. I got that replaced. However, when the indirect tank is in recovery mode (and no water is running in the house), the pressure will rise from 60 PSI (which is what I have the pressure in the house set at) to 120PSI. Of course, once I run a faucet or flush a toilet, the pressure immediately drops and if the recovery is done, the pressure rests at 60 PSI. Seems like this is not good. Thoughts?

Comments

  • GGross
    GGross Member Posts: 1,365

    You probably need an expansion tank installed on your domestic water side

    bburd
  • Jamie Hall
    Jamie Hall Member Posts: 25,262

    No, it isn't good. However, it's easy to fix… there should be an expansion tank for domestic water somewhere on the interior plumbing after the PRV at the entrance. Often on the hot water side near the water heater. If there isn't, you should get your plumber to install one, precharged to your normal water pressure (60 psig). Various websites, such as Amtrol, have guides for sizing such things…

    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England

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