One idea that just poped into my head is.
Have a mag pump in the pond and have like 40 feet of tubing that goes into your house and back out to the pond. If the flow was slow enough it would pick up the heat from your house and transfer that to the pond.
Put some insulation foam around the tubing that goes from your house to the pond and from the pond to your house.
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No matter what the morrow brings, inventors keep inventing things.
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Jonathan
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www.cakerybakery.ca
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