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Thread: 2 Expansion Tanks

  1. #1
    DIY Junior Member TimAllen47's Avatar
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    Default 2 Expansion Tanks

    I discovered that I have two water heater expansion tanks, one off the water heater and one under the floor in the crawl space. Do I need to have two expansion tanks? I do have low water pressure could this a be a possible reason why my presurre is low in the house. I only have one water tank in the garage.
    Last edited by TimAllen47; 02-12-2012 at 01:36 PM.

  2. #2
    Forum Admin, Expert Plumber Terry's Avatar
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    Default

    You only need one expansion tank, but having one doesn't lower pressure.
    Having two is fine.

  3. #3
    Retired Defense Industry Engineer jadnashua's Avatar
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    Do you have a boiler for heat? That second expansion tank may be for the boiler, not on the potable water system. While they look the same, you shouldn't use one for the other - i.e., not all are rated for potable water use.
    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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