BIG BEAM wrote:No need for any check valves.But that's just me.
I can understand your point about the check valve on the colad water inlet especially if you're blowing PRV. I also note more than few people have already set it up this way and I haven't heard anyone mention PRV troubles. As far as the one in the loop, don't you think it's practical to insure it's going through the coil first? The idea is to make it as economical as possible and extracting as much heat from the coil is first and foremost and sending cold water through the coil first when its at its coldest would be how you would accomplish that.