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Why is Hot water passing into zones that are not calling for heat?
I have multiple zones (3), each with its own pump circulator (Taco 007-F5 with no IFC in it). Why is Hot water passing into zones that are not calling for heat? It is because there is no IFC in this pumps? Replacing it with a pump with IFC will solve my problem? Why this pumps let water go thru the pump when the pump is not used? Do I need to add an additional valve to stop water flowing thru the pump when is not used?