Expansion tank sizing

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king3735

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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.
 

hj

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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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