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Where would an ECM circulator be best in this situation?
I have 1 zone of baseboard and 1 radiant zone (soon to be more). Where would a Grundfos Alpha fit into this system? I was going to use the Alpha on my primary loop along with a taco iseries 4way valve with odr for my radiant zone. I'm not sure now that would be the most efficient way to do it. I would still need two more circulators. If i eliminate primary secondary piping and use 2 zone valves how would I pipe the system to ensure the radiant loop is mixed and hot water is returned to the boiler? Can I do that with one Grundfos Alpha , trv. valves, and the iseries 4-way? The circulator has to be piped after the mixing valve so am I forced to use two circulators in this system? Would an ecm circulator work best in a system not requiring different temps if I only want to use one circulator for the whole system?