Expansion tank sizing

Discussion in 'HVAC Heating & Cooling' started by king3735, Jan 3, 2008.

  1. king3735

    king3735 New Member

    Jan 3, 2008
    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. hj

    hj Moderator & Master Plumber Staff Member

    Aug 31, 2004
    Cave Creek, Arizona

    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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