If you decide to upsize, you could use larger tanks like 275 gallon cubies and relocate the components to wherever is desirable, then the radiator idea makes more sense. If you have the height, use 2 vertical flow radiators (like most Japanese cars) instead of horizontal flow (like most American & Euro cars). Use a radiator hose to connect the top of the bottom radiator to the bottom of the top radiator. The combined thermosyphon effect ought to work well.
Craig
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"I‘d put my money on the sun and solar energy. What a source of power! I hope we don‘t have to
wait until oil and coal run out before we tackle that." Thomas Edison, 1847 — 1931
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