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Originally Posted by myv65
Not as you ask. You must understand that there's very little heat transfer from the motor casing to the fluid in an inline pump. Unless you improve the efficiency of the pump you can not change the amount of energy being transferred through the shaft, thus the amount of thermal energy put into the water from the pump.
Now you can "cool" the pump and some heat transfer may benefit, but you're talking about a situation analogous to a radiator. You're trying to remove thermal energy from the water. Look at the area of a radiator and the conductivity compared to the surface area and conductivity of a pump housing. If this isn't "pissing in the wind" or "barking up the wrong tree", then I don't know what is.
With all due respect to Joe Camel, I hunch even he would tell you that the quality of the radiator setup dwarfs any gain to be had at "cooling" the pump.
Having said all that, you certainly shouldn't lose any ground. IMHO it simply isn't worth the effort.
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ANyway, thanks for your explanation.