I dont think your understanding what I am explaining. The energy used is NOT completely converted to heat. The motor probrably does use what is stated on the label. When it says 20 watts it is NOT talking about heat watts it is talking about electrical watts. So when the label says "20 watts" It means it uses 20 watts of electrical energy not that it produces 20 watts of heat.
The only heat produced by the motor is from the resistance of the motor itself. The same way if you have a peltier with a tiny wire the wire heats up. This is the ONLY heat produced by the electrical current in the motor. There is also some mechanical heat caused by bearings/brushes but almost all magdrive pumps dont have any.
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