Jan 27 - I did the math on my heating requirements for a doublewall heat exchanger for the solar setup. 1.5 sqft of surface area doing 4 loops of an 85 gallon tank at 2.1 gallons per minute would with 140 degree water on the heating side would take the tank from 50F to 129F in a little over 2 hours. thats a worst case scenario. it's also livable since the electric required to do that is less then a penny. Total costs of this should hopefully be about $600 roughly or $400 more then the originally planned 300' coil of 3/4" pex
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