I have a 2HP Hayward Tristar pump that is starting to make a mild whining sound when it is on. The pump is about 6 years old. I am debating whether to replace the pump motor now, or wait until it stops functioning and replace the entire pump. I talked briefly about it with my pool service company (I maintain the water chemistry and do simple stuff, but I use them to clean the filters a couple times a year and more complicated repairs) and they suggested replacing the pump with a Pentair variable speed, which would actually be run at a fixed speed because I have a Paramount floor cleaning system that needs a certain amount of pressure to work correctly.
So that sounded a little goofy to me so I figured I would ask the experts. My three choices seem to be:
1. Replace the motor now (quoted ~$650)
2. Run pump until failure, replace with a new fixed-speed pump.
3. Run pump until failure, replace with a variable speed pump that basically only runs at 1 speed.
The guy suggested that option 3 would result in less energy use over time, but I don't really see why a variable speed pump running at 2HP would be more efficient than a fixed 2HP pump, so that didn't sound right. So my questions for you experts are:
Which option would you choose, and what pump would you recommend if you choose option 2 or 3?