"Energy is going into the loop in the form of kinetic energy from the pump. Do you agree?"
Yes but it is an infintisimal(SP?) amount. Mostly at startup of the pump. Once it's running 99.99999% of the heat comes from the motor of the pump.
"The same amount of energy that is inputed must eventually leave the system. Do you agree?"
Yes that extremely small amount must leave the system.
"The only way this energy can effectively leave the system is in the form of heat. Do you agree?"
Yes, the extremely small amount of energy is turned into heat.
HOWEVER
What we are talking about is the electrical energy of the pump. The only way the electricity inputed to the pump can be turned into heat is from the resistance of the materials of the motor. This is the wattage rating you see on the label. Which has nothing at all to do with the kinetic energy of the pump spinning...
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