I would take an educated guess and say that there is no equipment that is 100% efficient and there probably never will be.
I'm sure that one doesn't need to be an actuary to show the difference in efficiency between these two impeller designs that one is more efficient then the other.
The vaned rotor is the most efficient until something else comes along.
Like I said, given the choice I'd pick it over the paddle but I don't think that if I am running the paddle design that I am in serious jeopardy of any eminent disasters.
But I'd run a pump with the bypass hole and the Cleveland thermostat. A 180. Which is what the thread was before it got sidetracked. ...ok. I'm guilty. So shoot me.
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