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hw heating- pumping through boiler?
After reading both "Pumping Away" and "Classic Hydronics" I have learned a lot about why hw circulators should be on the supply pumping away from the boiler for optimum performance of a hw heating system.
While surfing through Weil-McLain's website, I came across the manufacturer's recommended piping of some of their boilers suggesting to pipe the circulator on top of the boiler. However the flow showed the circulator pumping into the boiler even though the diaphram comp. tank and water feeder was near the circulator on top of the boiler. The PONPC was on the suction side of the circulator as it pumped through the boiler making the lower connection the supply instead of the return.
Now I'm a little confused???
Can anyone explained this to me? I'm sure it works but is it the best way? Weil McLain must know, no?