king3735 New Member Messages 1 Reaction score 0 Points 0 Jan 3, 2008 #1 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.
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 Master Plumber Messages 33,613 Reaction score 1,057 Points 113 Location Cave Creek, Arizona Website www.terrylove.com Jan 4, 2008 #2 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.
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.