Mark, I just installed the Whisperflo 1/2hp WFE-2 because it was the only reasonable choice I could get in time to replace the 1 hp Sta Rite I sold.
As it was I was pumpless" for 48 hours.

The Whisperflo seems to run a lot cooler and pump about the same volume. Pressure dropped to 15.5 from 17 psi.
Since the SF on the 1HP Sta Rite was 1.25 would you have any idea how much I might save with the new WhisperFlow running 8 h per day.
Cost of electricity is $0.20/kwh

Thanks for your help, Gary

ps. I am in the habit of backwashing into a 55 gal drum. The old pump took 62 seconds to fill it. I will be able to compare pump volume easily when I back wash with the new pump.
BTW I gravity feed the back wash water back into the pool after it settles and clears. Essentially I use only a gal to back wash my pool