[bcrdukes]

I will admit that I don't know 100% whether it's using potable water, or if there's a water-to-water HX. I'd really have to triple check on a follow up visit. All I know is there is a hot water tank that appears to feed the hydronic furnace for heating. If it means anything, the furnace is serviced once a year, and has a solid history of service since it was put into service.