Quote Originally Posted by GaryT View Post
Currently a 17 yo sta rite duraglas 1hp -- btw is the SF-N2--3/4A equivalent to the 11771 Whisperflo?

The 1/2 HP Hayward Tristar SP3205EC has been strongly recommended. Would it serve my needs or would it cavitate?

Thanks!
Pumps rarely cavitate and only under very unusual circumstances so that should not be an issue. In fact, it is harder to make a small pump cavitate than it is a larger pump.

If you are going with a 1/2 HP pump, I would go with the Whisperflo WFE-2 but you won't save nearly the amount of money as you would with a two speed. The Superflo has a better energy factor (gallons/watt-hr) than either the Whisperflo or the Tristar AND it is a two speed.