Expansion tanks quandry


Old 03-16-14, 07:00 AM
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Expansion tanks quandry

I am planning on replacing my American Standard 45 year of Hydronic baseboard heating system boiler with a Weil-McLain CGa 3 Natural Gas. This boiler is slightly larger than the one I am replacing. My old system has a closed type expansion tank and I plan on using diaphragm type for the new system. According to the specs on the new boiler the Net AHRI rating is 51,000 BTUH, with an input rating of 70,000 BTUH. Expansion tank calculators I found on the net allow me use either 50,000 or 75,000 for NET AHRI so I am not sure what size tank to purchase. Any help would be appreciated....thanks.
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Old 03-16-14, 09:22 AM
Join Date: Oct 2013
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If you have all fintube baseboard a #30 extol tank is fine. If you have cast iron rads they recommend no less than a #60 regardless of the btu's. It has to do with water content in the system.

Good Luck,
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