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Primary/Secondary Boiler Plumbing Question
Hi All - I was looking at my in-law's Viessman boiler installation, and something struck me as not right about it. It's plumbed for 4 zones and a DHW tank. It looks like this:
What doesn't look right to me is the left-most circulator. Is it installed backwards? Shouldn't it be pulling from the expansion tank, which is plumbed on the supply side of the primary loop?