Quote:
Originally posted by jaydee116
Thats what I originally thought, but then after seeing Cathars results I thought I had it backwards (again). If I am reading it right the more Cathar loaded the pump the less power it used. 
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This was counterintuitive to me as well, and myv65 explains it in the thread I linked above.
A centrifugal pump is actually more loaded when running wide open than when restricted,
when pumping water.
However, I expect the load on the pump to be lower when 'pumping air' than when pumping water, regardless of whether the water case was wide open or deadheaded. (Till the 'bearings' wear out anyway.)