Quote:
Originally posted by freeloadingbum
What can a pump manufacturer do to minimize the heat from transfering into the water?
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Make the impellor and the housing not metal and make it not attached to the steel shaft. Study some pumps it is pretty basic. The Danner and VIA's and similar are all compacted together with the impellor directly on the shaft. Pumps like the Little Giant previously mentioned and my HydroThruster500 have true mag drive impellors. That means the impellor is NOT attached to the shaft of the pump. The housing is plastic and moved away from the pump motor so the heat doesn't transfer to the water as well. Iwaki is another good one as they take extra efforts to keep the heat out of the water. it is very important in some aquariums to keep as much heat out of the water as possible for some of the more touchy fish.