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Adding a 30 gallon buffer tank to my heating system. Total capacity of existing system is about 10 gallons so, with the buffer tank it will be about 40 gallons. Existing expansion tank has a Pure Pro label on it but no specific size or model number that I can see. Looked up Pure Pro on line and it appears that the installer probably used the Pure Pro 1" Standard Boiler Trim Kit which uses the AMT 30 (Amtrol #30) expansion tank. Using one of the charts I found on line it says I need about 7% of the system capacity for the expansion tank. (2.8 gals) The Amtrol is listed as 4.4 gallons capacity which I am guessing is the total volume of the tank. Is that also the usable capacity or do you calculate usable capacity as a percentage of the total volume, i.e. 50%, 75% etc.?
Guess the question is: Does this expansion tank have sufficient capacity to handle the added 30 gallon buffer tank?