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How do I calculate the expansion type on a home gas boiler

Tonyrizman
Tonyrizman Member Posts: 1
in Gas Heating

Hello all,

My question, How do I calculate the expansion type and size on a home gas boiler.

2 family height 30'

I installed it about 30 Years ago, the old tank no longer has any marking on it, it filled with water and I need to replace it

I'm sorry if I didn't give enough information.

anthonygiaimo@outlook.com

Thank you.

Comments

  • Jamie Hall
    Jamie Hall Member Posts: 24,727

    The expansion tank size — specified in gallons — is based on the total water volume of your system. Several manufacturers of tanks have handy calculators and tables to help you determine what size you need.

    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
  • hot_rod
    hot_rod Member Posts: 23,270

    Do you have a lot if large diameter steel piping? If so use the long calculator, but you need an estimate of the systems water content

    https://www.amtrol.com/resources-rewards/selection-tools/

    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
  • Big Ed_4
    Big Ed_4 Member Posts: 3,005
    edited September 8

    The #30 tank is used in most homes built after 1960 …..

    There was an error rendering this rich post.

  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 16,400

    @Tonyrizman Post some pictures so we can see what you have. If the old expansion tank was adequate just replace it with the same.

    Drill a hole in it to drain the tank they can be very heavy when full of water.

  • HomerJSmith
    HomerJSmith Member Posts: 2,635
    edited September 9

    If you error, error on the side of larger. Send a pics of your old tank & sys.

  • GroundUp
    GroundUp Member Posts: 2,091

    Size is calculated by system volume and temperature rise (NOT by BTU as many "calculators" will tell you). As was stated, assuming the original was adequate for 30 years, just replace it with a like tank. The standard tanks are around 4 gallons and often referred to as a #30 which is roughly 11" diameter and 15" height. The larger #60 is also 11" diameter but quite a bit taller (maybe 25" as a guess).

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