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I am adding in slab radiant to my current boiler radiant system. I have a few questions:
1)I understand i want to keep loops to 300'(1/2" pex O2 barrier)' or less at 250' what is a good pump size for 25X25X10 area well insulated? Spray foam insulated all around 6-8"thick.
2)I have a dunkirk QSM boiler w/outdoor reset heating via old cast iron(lower Delta T) It will be heating the house via this method. The Pex is for garage & basement slab and second floor of garage, I expect to need some mixing valves, can I use the return water loop as cold water supply to mixing valve? Should I "UPSIZE" the mixing valve?
3) I am planning on 3 loops(roughly 250' each loop) in the 25' X 25' slab spaced roughly 10" apart.does this seem reasonable? (Enough btu's to keep garage above 55 Deg F?) I know some of this answer is in question #1 flow rate and "head" of the pump
4) I am going to use "warmboard" insulated underneath for the floors that have an open area(heated) under them. Any comments?
5) I currently have a supply & return header supplying for 4 zones with an air scoop. do i need seperate air scoops for the pex zones?
Thanks,for your time and effort,Joe