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Thread: Water heater expansion tank

  1. #16
    Moderator & Master Plumber hj's Avatar
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    IF the tank is set at the house pressure, there will be little, if any, water in it.
    Licensed residential and commercial plumber

  2. #17
    Forum Admin, Expert Plumber Terry's Avatar
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    IF the tank is set at the house pressure, there will be little, if any, water in it.
    That's not how it works in Seattle.
    Here, when you have an expansion tank, and turn the water off, it takes a while for the water to quit draining. It's like a delayed shutoff.
    Without the expansion tank, off is off.

  3. #18
    DIY Senior Member Reach4's Avatar
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    Quote Originally Posted by Terry View Post
    That's not how it works in Seattle.
    I laughed at that one.

    Then I thought, what if the tank was pre-charged with 60 PSI of air and the city supplies 60 PSI water? Maybe that tank would do a better job of being able to accept over-pressure water, as the water heated, than if the tank was pre-charged with less.

  4. #19
    Retired Defense Industry Engineer jadnashua's Avatar
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    Quote Originally Posted by Reach4 View Post
    I laughed at that one.

    Then I thought, what if the tank was pre-charged with 60 PSI of air and the city supplies 60 PSI water? Maybe that tank would do a better job of being able to accept over-pressure water, as the water heated, than if the tank was pre-charged with less.
    That's how they are supposed to be installed...set the precharge to your NORMAL water pressure, then the bladder is at equilibrium, providing the full capacity of the tank, and not having to be stressed as much by overstretching it. Now, when the WH causes the water to expand, it has the full capacity of the tank to absorb it. When you open a tap, the ET will release the water it is storing, and be ready for the next time the WH is running.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

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