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Hi, I looked at a hydronic system the other day that had a circulating pump on the supply side and another on the return side of the boiler piping. As the boiler fired and the pumps ran one could hear the distinct sound of air being pumped through the piping. I have never seen such a double pump set-up. Comments please? Btw, it's a cast iron boiler in a single family home; the radiators were originally gravity fed but were converted to a circulating system some years ago. Thanks!