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Sizing your hot water expansion tank? Maybe too small?

I am trying to understand how to determine what size expanion tank you need. It seems that most install the 4.4g size but I see some that have the 8 gallon. Is this determined by size of the system, meaning total water volume? Thank you


  • STEVEusaPA
    STEVEusaPA Member Posts: 6,505
    Yes total amount of water volume. Both manufacturers' websites have handy sizing charts, and apps

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    EBEBRATT-Ed Member Posts: 15,613
    Try googling "Amtrol Engineering Handbook"