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Outdoor reset Tekmar to Taco ECM?
Hi, I have a radiant pex between the joist floor system powered by a heat exchange to 3 way taco manually set mixing valve to a Taco ECM vt2218 pump to 4 zone valves controlled by a taco zone controler. Looking into an outdoor reset setup. Interested in the Tekmar 256 or 356. Looking for others experiences with these or similar.
The tekmar 256 would only turn on the pump on/off. The 356 would additionally control its speed.
I spoke with tekmar and the issue is that the 356 controls only 3 speed wet rotor pumps, not the ecm variable pumps (unless I turn off the ecm function which would make this pump a non ecm pump). Also I might have to change the mixing valve for the 356 to control?
Any input? Just trying to get the most economical but efficient outdoor reset setup.