Hello all, I am new to both these forums and to pool pumps in general.
My WhisperFlo 2 HP WFE-8 motor needs replacing, and I decided to switch to a 2-speed replacement: Pentair 071320S. (Specifics about my pool setup are in my signature). My plan is to run on low speed 24-hours a day and manually switching to high speed during cleaning (and possibly during solar heater use, if needed).
My confusion starts with whether or not the 071320S is a SuperFlo or a WhisperFlo. Reading through Pentair's web site, it looks as though 071320S can be used for both pumps? Is this correct? Also, I sometimes see the 071320S sold as a 1.5 HP, and sometimes as 2 HP motor. Does this depend on whether it is being used as a SuperFlo (2HP) vs WhisperFlo (1.5HP)? Or is it just a matter of using a different Impeller?
Assuming that the 071320S can act as a WhisperFlo motor replacement, should I 'downgrade' my Impeller from the WFE-8's 2HP version to a 1.5HP Impeller (or even 1HP Impeller)? My initial calculations for GPM I would need are ~22 GPM if running 24-hours per day, up to 73 GPM maximum based on my plumbing (my numbers may be off; I'm new at this). Looking at the WhisperFlo performance curves it looks as though 1.5 HP would be sufficient, however I am concerned about providing enough power to utilize my roof solar heater.
Any help in demystifying all of this would be most appreciated!