Here's my tentative distribution plumbing plan. I have pex in the basement which I would like to split into two zones supplied by one pump, and I have it in floating slabs on the first floor, which I would like to also split into two zones supplied by a separate pump. P1 and P2 are Viridian variable speed, delta P pumps...Reason for two pumps and the crossover is the ability to run some heat in case a pump goes out. 4 zone valves as shown. Supply is from (2) 500 gal propane tanks in the basement. Supply temp set by outdoor reset with a motorized mixing valve. Calculated flows at design point of 80,000btu/hr load are 16 gpm total, 8 gpm upstairs, 8 gpm downstairs, then 4 gpm through each of the 4 zones, which yields about 0.5 gpm through all of the infloor 1/2" pex (all loops are the same length), with a 10F delta T.
Greatly appreciate any feedback....Thanks!
Greatly appreciate any feedback....Thanks!