I would think you would have to sit on them a long time to sell them, they are perfect for a very small project but not many people doing projects like these. I would think you would have better luck selling to whole unit even if it isn't working. Overclockers usually start in the 5,000 Btu range and up, that's because they can just use a water cooled system for cheaper than running a small compressor.
Heating 1,000 gallons of water is no small chore.
Water weights 8.34lbs per gallon, you have 1,000 gallons so 8,240 lbs. It take 1 btu to raise 1 pound of water 1 degree. So 8,340 btu is needed to just move it one degree. I would be looking for a compressor anywhere from 5,000 to 12,000 btu. And that is all under perfect conditions, like reasonable air temp and no heat loss.
A DC inverted mini split outdoor unit and a stainless steel in-tank condenser might be your best bet.
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