My water pressure education

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by KKfromNJ, Sep 8, 2008.

  1. KKfromNJ

    KKfromNJ New Member

    So, this all started with a simply water heater replacement. My parent’s 70-year-old home has an open water system; they never had a water pressure regulator. I’ve learned a lot since posting about a “vacuum relief valveâ€. My Dad’s a tad set in his ways, “We’ve lived all these years without all that fancy stuff, why do we need it nowâ€.

    I picked up a cheap watts screw on pressure gauge; the instructions say if it’s above 60 psi you need a prv. Their house reads a hair over 100psi. I guess I have to battle with Dad a little :eek:

    I can hear them now :mad: “My shower was fine till you messed wih itâ€.
  2. Redwood

    Redwood Master Plumber

    Actually it's above 80 Psi. you need a PRV but neither here nor there he needs one...
  3. Furd

    Furd Engineer

    Wet side of Washington State
    I disagree. While current plumbing codes may have some magic number above which a pressure reducing valve is mandated, the mere fact that this particular house has done without for several decades PROVES that a PRV is not NEEDED.

    I know where there are hundreds, if not thousands, of residences that have in excess of 100 psi city water service without also having PRVs to reduce the pressure to below 80 psi and they survive just fine. That said, I agree that limiting the water pressure inside a residence to 80 psi or less is a good idea.
  4. Gary Swart

    Gary Swart In the Trades

    Yakima WA
    I would say that it comes down to what each of us define as "need". True, you home will not suddenly explode if it has 100 psi. However, there is no question that 100 psi will be hard on appliances, but since not all appliances and etc., will fail due the this pressure, it would be extreme to say that a PRV is absolutely necessary. It is my opinion that in these cases that wise, advisable, desirable, or similar words might be a better choice. So perhaps those of us who deem a PRV necessary for a PSI of over 60 or 80 might want to back off a tad on the use of need.
  5. Ian Gills

    Ian Gills Senior Robin Hood Guy

    When you tell him he also needs a new expansion tank on his water heater to go with his new PRV he will feel vindicated.

    Open systems rule! I love mine.

    Expansion tank. No thanks!

    Watch the meter roll backwards. Cool!
    Last edited: Sep 8, 2008
  6. Redwood

    Redwood Master Plumber

    Okay so the code says 80 PSI and above requires the installation of a PRV...
    So what if there is excessive velocity in pipes, valves may fail prematurely, toiet tanks never empty down enough for flappers to close and water is wasted, and the higher pressure may shorten water heater service life...
    If the T&P doesn't drip don't worry about it...
    It's not my house!

    You don't need to install one! I recommend that you do though!
  7. Cass

    Cass Plumber

    Open systems are a disaster waiting to happen with a back flow incident.

    If there going to keep the 100 PSI at least they should install a watts #7 check valve and Exp. tank.
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