Working with PB now on equipment list on a new build. Pump will be a Pentair Whisperflo 3/4 HP or 1HP, depending on final agreed pool size. Looking like its going to be a 24x12 give or take with a max of 300 sq feet. I will have a Polaris 280 and booster pump as part of the package. There will be a SWCG, and heater (heat pump) as well. Depending on the how much is left in the budget, we would like to add a cascade or rock fountain. PB said it is my decision if I want the 1 or 2 speed pump, but feels that in this case a 1 speed may be fine. His thoughts are this. The Whisperflo 3/4 HP is very efficient pump. Not sure how efficient or non-efficient the 1 HP is compared to the 3/4 HP, but PB feels that we should be able to get away with the 3/4 HP. In the Boston area we pay a flat rate per KW ($.19) as opposed to some states which pay for peak or tiered pricing. Pool is small so turnover runtime is not very long. Our swim season is not year long so the ROI is longer here in New England. Again, the decision is mine, he was just throwing it out there.
Running a SWCG at a lower pump rate may have benefits, but I know running the heater, which may happen often here, will need a higher pump rate.
Would I see much greater benefits going with a 2 speed?