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Expansion tank on the supply or return side?
Hey guys, I have baseboard heat in the house with a Weil McLain GV series boiler and zone valves. Currently I have a closed type expansion tank that started leaking at one of the seams. I am going to replace it with a bladder style tank with a Spirovent and an auto fill valve which my system currently lacks. Unless I'm mistaken the boiler manual and the instructions that came with the tank are telling me two different things. One is saying install the tank on the supply side, the other the return side. Am I missing something? Does it matter?