The Sta-Rite pump is PHK2E6D. I was also looking at the Pentair WhisperFlo WFE-2. It looks like it delivers more gpm for the same head as the Sta-Rite. The pump is for my father's pool and he wants to keep the cost low and doesn't want to have to rewire for a 2-speed pump. The pool doesn't get used much so he only needs to run it for about 3 hours/day to keep the water clean, so electricity use is not as much an issue.