Higher pressure than before.

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by OhioBuck77, May 29, 2011.

  1. OhioBuck77

    OhioBuck77 New Member

    Messages:
    2
    Location:
    Southern Ohio
    I just installed a new water heater and a new thermal expansion tank and my water pressure is a good bit higher than it was before. This doesn't seem right to me. But I have never installed a thermal expansion tank before so I really don't know. Any idea what is going on? Any answers would be appreciated!!
  2. Redwood

    Redwood Master Plumber

    Messages:
    7,450
    Location:
    Connecticut
    The dielectric nipples on the old water heater may have been occluded lowering the flow, or maybe the valve you shut off to do the work was not fully open...

    If you have any concerns about your work post a picture...
  3. LLigetfa

    LLigetfa DIYer, not in the trades

    Messages:
    4,185
    Location:
    NW Ontario, Canada
    I very much doubt the expansion tank would have anything to do with the pressure difference. They are too small to provide pressure storage.

    Perhaps the old water heater was gunked up with hard water deposit reducing the flow.

    Perhaps the temperature on the new tank is higher so there is more cold added to the mix. I deliberately set the temp on the water heater so that the shower temp is just right with both hot and cold full open. That provides the most flow which translates to more pressure from the shower head.
  4. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    27,258
    Location:
    Cave Creek, Arizona
    Expansion tanks do NOT change the pressure, they just respond to the pressure you have, so either something else has occurred, or your perception is faulty.
  5. Terry

    Terry Administrator Staff Member

    Messages:
    15,416
    Location:
    Bothell, Washington
    Pressure or volume?

    I always notice that there is more usable hot water from the faucets when an expansion tank is installed.
    They buffer the input when a faucet is opened elsewhere in the system. I wouldn't personally have a home without an expansion tank.
  6. Redwood

    Redwood Master Plumber

    Messages:
    7,450
    Location:
    Connecticut
    Oh jeez... Here comes BallValve...
  7. Terry

    Terry Administrator Staff Member

    Messages:
    15,416
    Location:
    Bothell, Washington
    Ballvalve lives in a cave.

    His water comes through a spring that weeps out from a crack in the ground.

    cave_ballvalve.jpg

    Ballvalve fetching wood to heat his water.
    Last edited: May 30, 2011
  8. DonL

    DonL Jack of all trades Master of one

    Messages:
    4,516
    Location:
    Houston, TX
    LOL, That is funny, I don't care who You are...


    OhioBuck77, it sounds like you have it working normal.
    Last edited: May 30, 2011
  9. Neanderthal Man

    Neanderthal Man The Cave Man

    Messages:
    11
    Location:
    In a Cave
    Hey Don't be picking on my little brother.
    It isn't easy being a Cave Man.
    Especially since those damn Geico Commercials.
    We have feelings you know.
  10. DonL

    DonL Jack of all trades Master of one

    Messages:
    4,516
    Location:
    Houston, TX
    Is that why they canceled your TV show ?

    Did not mean to poke fun.

    Your brother is cool.
  11. Neanderthal Man

    Neanderthal Man The Cave Man

    Messages:
    11
    Location:
    In a Cave
    No the director said that Ballvalve couldn't take direction.
    And then he shaved thinking it would make it easier to pick up the babes.
    It was all over after that the shooting delays made them mad.
  12. Redwood

    Redwood Master Plumber

    Messages:
    7,450
    Location:
    Connecticut
    I can understand that... He does seem a bit headstrong...
  13. PlumbersSanJose

    PlumbersSanJose San Jose Plumber

    Messages:
    6
    Location:
    San Jose
    Pressure is always easy to figure out. I think the first answer regarding build up in the pipes or the valve not being turned on all of the way is the best answer.
  14. OhioBuck77

    OhioBuck77 New Member

    Messages:
    2
    Location:
    Southern Ohio
    Thanx for your input I think it is okay it has been almost 6 days and everything seems to be doing fine. The pressure starts out harder and then dies down to close to where was before I installed the tank. You have a great forum here. Thanks again!!
  15. LLigetfa

    LLigetfa DIYer, not in the trades

    Messages:
    4,185
    Location:
    NW Ontario, Canada
    The expansion tank has a small amount of "storage" that quickly draws down. That in and of itself, indicates that there is a flow restriction somewhere upstream.
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