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1 or 2 zones for a garage and snow melt system
When I built my garage and did the landscaping I laid 3 x 250' rolls of pex in the 4" garage slab (with 2" of foamular insulation below it), and 2 rolls of 5/8" Alum-a-pex outside in packed sand, with reflective insulation underneath, with 1" thick stone tiles 1" above the pex.
My main question is, should I:
- Build the water distribution with 2 zones (separate pumps and manifolds), 1 zone for each purpose?
- build only 1 zone, using actuators on each valve to control the water flow for each systems pex?
I only intend to keep the garage at 55 degrees, and run the water/propylene glycol at between 110 - 130 degrees. Would a 4.4 gallon expansion tank be sufficient for this system?
I intend to model the system on something like this Home Depot distribution system
. Any thoughts on that design?
Thanks for any advice.