Of course that's what I'm saying! Think about it for a sec: where does the heat come from? the case of the pump? No, it comes from the motor coils, to which you can't attach a metal part, to cool it, so the solution is to ventilate the pump.
What pump are you using, anyways?
BTW: that amount of heat may or may not get into the water. Regardless, most of the heat comes from the pumping action, unless your pump is being run at a very inneficient rate.
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