Quote:
Originally posted by AZDesertRat
Returning flow back to the sump actually makes a centrifugal pump run hotter not cooler. When you restrict the discharge side you reduce the amount of work the pump is required to do and reduce the wattage consumed meaning less heat produced.
When you return part of the flow to the sump you are requiring the pump to work harder to pump the total volume of water even though you are only using part of the water. More work equals more power consumed whcih equals more heat produced.
All pumps create heat as they are not 100% efficient. Some are better than others though.
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From what I thought I knew about electricity. This would be wrong. So I put my kill a watt meter on my 9.5 and got 76 watts. I closed the ball valve a bit, and it went down to 69 watts. I don't know how this effects the heat output or lifespan, but it definitely lowers the wattage.