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Thread: Expansion tank sizing

  1. #1

    Question Expansion tank sizing

    Whats the rule of thumb in sizing expansion tank? Currently I have a 70 btuh

    gas fired lennox boiler with an ordinary steel expansion tank, I think there's no

    bladder inside, thanks for any input you can give.

  2. #2
    Moderator & Master Plumber hj's Avatar
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    Default expansion

    The amount of expansion to raise the pressure of a closed system is about a cup or two, so a 5 gallon expansion tank is adequate for all but the most antique systems.

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