Well consider that in a car the themostat cuts the water flow until it reaches a certian temp allowing the water in the rad to thrughly cool it might make sence I had a old car that would over heat and I found out it had no thermostat I put one in and no more probs, I'm no thermall enginner but it might make sence that a slow rate where the water is in the rad longer might make a diffrence in efficiency.
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