I'm new to the OWB world, currently installing a Portage and Main BL 2840 to replace a Propane fired condensing modulated boiler that was replace once under warranty for leaking, and then the replacement lasted 4 yrs more.
Boiler was for radiant floor heat in the entire house ( 3 Zones) and domestic hot water. I have separated the DHW from the radiant boiler as I don't wish to burn during the summer months. I installed a Geo springs heat pump for that.
The OWB will run to a heat exchanger, replacing the boiler entirely. My 3 zones are operated by 2 pumps on the supply side, (two basement zones share the same pump, and both zones share the same return pump.
My problem is finding a zone controller that will operate 3 zones that will operate the return pump no matter which zone calls for heat.
When I look for zone controllers, a lot of the technical info is not listed. Anybody with any ideas? Thanks, Tim