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Some is used as mech energy, some as heat.
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NO!
All energy is coverted to heat. Always. If your pump uses 30w under normal conditions, its producing 30w of heat.
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Airspirit... how is this heat being put into the water though? The impeller and casing are made from polypropylene, and the impeller shaft is ceramic and is "attached" to the motor with a magnetic field... the motor, which is the thing making all of that damn heat is never in contact with the water. Like I said, I want some numbers.
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The casing is also made of insulating plastic, and clearly the heat is leaving the pump somehow, so how is relativly unimportant.
My guess is that since both the coolant and the air are about equally insulated from the motor, the coolant takes more of the heat then the air simply by virtue of its much higher flowrate and conductivity.
Another thing to consider is that not 100% of the pumps heat is dissipated at the pump. After all the coolant is moving, and thus carring away a good deal of kinetic energy that only becomes heat later.
Considering this I'd guess that about 2/3 to 3/4 of the the heat goes into the coolant typically, but this is just a shot in the dark. I'm probably off.