Dude, WTF are you talking about? The friction of the water and the tubing/blocks/whatever creates, effectively, no heat. If we were creating high pressures, 40PSI+ then you would get some heat from the pressurization of the water, but we aren't.
The electrical energy of the pump is NOT completely converted into heat. If it was then the motor would not spin. The only reason heat is generated by the pump is from the resistance of the materials of the motor and also from mechanical moving parts in the motor(bearings/brushes).
I dont know what the hell your talking about unpluging the pump. Of course if you unplug the pump the water stops moving. You just removed it's source of movement. The reason it stops so soon is it has almost no inertia and because the pumps impellers have effectively damned the water off...
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