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As long as this has come up - I would love to know why folks are convinced that a 56 frame motor is more energy efficient than a 48 frame.
Chas,I do not know about them being more energy efficient but they will dissipate heat better and should run cooler ....since heat is something that does shorten a motors life they should last longer...
Any dealers or consumers have any idea which company makes the best pump? I spoke with a Marquis dealer today and he said for reasons unknown to him, G.E. started making their pumps with less copper but Marquis switched to AquaFlow anyway. He didn't state specifically but thought the contract had probably expired with G.E. I know Coleman uses A.O. Smith motors and their tubs are very quiet. 56 frame motors seem to get lots of mention by any dealer I talk to but overall I do not know which company makes the best motor.