Quote Originally Posted by leena View Post
thanks for the replies!sorry for so many questions at once:/

So if I have a 1.5hp pump, when Im runnin it on low does that make it the equivalent of a 3/4hp while on low?

If so, Im thinking I need to get a 1hp so that when Im running it on low its the equivalent of 1/2.......
It doesn't quite work that way. For a 2-speed pump, the low speed is typically 1750RPM and the high speed is typically 3450RPM. While those numbers are roughly 1/2 one another, that doesn't necessarily equate to a pumps power consumption (horsepower) being half. For example, I have a variable speed pump and a control system that lets me set the RPM value and then reports back how many watts of power the pump is using. When I set the pump RPM's to half the max speed, it does not use half the amount of power at high speed.