I don't normally agree with frank, he has a good point, your facts seem to be based on alot of wishful thinking, for one coolant does not cool twice as fast if you move twice as much past it, this is why low speed pumps are popular for solar hot water systems, because the systems work best if you get as much heat out of the fluid as possible before putting it back to get heated, high flow pumps lead to over heating, also where are these motors that you are talking about using? or are you going to hand build them?
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