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outdoor reset

I have a WM HE-5 with 5 zones, Honeywells zv's, forced hot water system. I would like to add an outdoor set back for greater efficientcy an comfort. What manufactor would you recommend and model? The only changes I plan on the system is to add some floor warming in bathroom down the road and poss. change to constant cir. All my raditors are cast iron or panel rad's and i thought constant cir. better Honeywell or Taco 256 or is the 256 an overkill for my needs???????


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