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shag26272,
do you have access to a watt meeter? if so i am curious as to how much your pump is using. These Eheim pumps are rated at 80 watts and normally run around 40 watts with the normal NW. I live in CA where Electricity is around .39 a kilowatt hr so efficiency is my bottom line.
I do not believe weight is the factor, I would say that it is the added friction with the water adding resistance.
Steve G
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