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Originally Posted by HammerSandwich
Don't you need much more area on the air side because of the difference in specific heat between air and water?
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Yes...
Not to mention the difference in convective cooling between a liquid/metal interface and a meta/air interface! FWIW, the return water gets directed straight up into the main body of the Reserator, which produces good mixing (you can actually see the water surface swirl slightly) so there is no "short circuit" of warm return water being sucked right into the pump.