2 Expansion Tanks

Discussion in 'Water Heater Forum, Tanks' started by TimAllen47, Feb 12, 2012.

  1. TimAllen47

    TimAllen47 New Member

    Feb 12, 2012
    North Carolina
    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: Feb 12, 2012
  2. Terry

    Terry Administrator Staff Member

    Aug 17, 2004
    Bothell, Washington
    You only need one expansion tank, but having one doesn't lower pressure.
    Having two is fine.
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  4. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Sep 2, 2004
    Retired Systems engineer for defense industry.
    New England
    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.
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