A number of posts have said that designing any Geo system involves knowing water flow through the ground. This was a surprise since it seems almost impossible to know. Recently was told that in upstate New York, the ONLY systems that work are SCW and that a closed vertical loop cannot succeed. And SCW don't require toxic antifreeze. SCW don't require water good water production since the water is return from where it is pumped ... it just requires water in the well. This raises the question: Would not the designed deep requirement be the same for SCW verses vertical closed loop? For example, if a vertical closed loop required 150' / ton to ensure EWT above freezing, would not a SCW require the same? Or wouldn't a SCW require more depth since LWT must be stay above freezing?