If you measure the running current and know your electric rates you can get a close $$$ savings number. I never measured anything for savings purposes. At 100% efficiency, which is not the case, it is 746 watts per HP. So multiply by 1.5 as an efficiency fudge (just a guess on my part) and you have around 1100 watts per HP. Running a 1 HP pump for 1 hour with my ficticious efficiency fudge factor and you have 1.1 KWH (kilowatt hour). For a 1/2 HP pump it would be .55 KWH. If the electric rate is 10 cents per KWH you save around 6 cents for every hour as the difference between a 1 and 1/2 HP pump. If you run it 8 hours a day that's about a 50 cent per day saving, or about $15 a month. That little 6 cents an hour adds up. Another consideration is lower HP thus lower flow yields better filtering.
Al
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