Any decent pump is going to add heat to the system. Ambient's test clearly shows that as long as you have a decent radiator, this is not an issue, even with a Danner 500 gph pump which runs at 45 watts. His water temps. increased by 1-2C with the radiator. Most heater cores can tolerate a heckuva lot more heat than that. I have 4 pelts., two pumps and two waterblocks in my system and the heat from the pumps is easily handled by the radiator.
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