Wow good suggestions and ideas. I'm looking into the good and the bad of all that's been said. But Jeffs ideas of pump and dump just took the cake I think. I didn't like the idea of closed loop with water but I never thought about open loop. This would be so easy that it's almost wrong for me not to do it. I would need a pump probably 8 GPM but that is the only down side. I'm thinking a super insulated 1 inch or bigger PVC pipe run out of the pump straight down 7 feet deep all the way to the pond edge and then 17 feet down to the bottom where the coolest/hottest water should be. And then the dump can just be maybe 2 feet deep to the edge of the pond.
How about building my own 4 ton hx?
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