We are installing a radiant in floor (slab ) system using the Water Furnace Synergy 3D. Due to the installer not having the tubing in time to meet our schedule , and 1/2 inch X 300 ft. which was the original spec not readily available, we are considering using 250 lengths that are available today. We pour in 5 days ! My question is besides adding more loops to make up the difference, and changing the loop layout, what else do I need to be concerned with. Pump GPM ? Size of GSHP? Are there limits to how many loops on a zone. The original called for 4 loops in the garage, and 7 in the house. The original installer says to stay 6 inches off the walls, and use a 12 inch spacing in the garage (zone 1 ), and 9 inch spacing in the living space ( zone 2 ) Garage is 1020 Sq. Ft. Living space is 2248 Sq. Ft. Thanks in advance.....
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