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Where would an ECM circulator be best in this situation?

HydroNiCKHydroNiCK Posts: 92Member
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?


  • hot_rodhot_rod Posts: 11,672Member
    If you need multiple temperatures it will require several pumps and s mixing device

    I’d use all ECM pumps

    You can mix down with thermostatic valves motorized valves, or vs pumps
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    The magic is in hydronics, and hydronics is in me
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