How often does the tank get to your max temperature in the winter? in the shoulder seasons? any time there is sun and the pump is off that's wasted heat.
Maybe a seasonal thermal store is in order? 3000 gallons methinks. That's a 7.37 ft-per-side cube. build it with more insulation, especially on the floor contact area. More house treatments would be much better however.
Last edited by slopecarver; 03-19-14 at 04:15 PM..
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