I'm installing my new EcoTech VS 1.5 HP motor on my Hayward SuperPump, and ran into a bit of confusion.
The pool was installed somewhere in 1997-2000 by the original owner of the house, who was also a pool builder. It appears that he Frankensteined the pump assembly.
The pump body is a Hayward SuperPump, Model No. SP2621X25, which is supposedly a 2.5 HP model. (Although I suspect that the same pump body is used for various HP ratings.)
The motor is an A.O. Smith 1.5 HP, 2-speed unit with a Service Factor of 1.3.
The impeller is a Hayward SP2610-C, which is rated at 1.0 HP.
The piping is 1.5 inch. The pump/filter/heat pump are 4-5 feet above water level. There is 22 lbs. of back pressure (!) from the filter (Tagelus TA-60, Zeolite that was just cleaned, newish multiport valve). There is a 30 foot run to/from the heat pump, which adds even more head when the heat pump is in-circuit during the summer.
With the heat pump bypassed in winter, I could run the pool, water feature and (just barely) Liquidator with the motor on low speed. With the heat pump in-circuit, I had to run the motor on high speed.
As part of installing the new EcoTech VS motor (1.5 HP, Service Factor 1.6), should I change out the impeller for a 1.5 HP rated impeller? I'm looking for maximum energy efficiency while keeping all the pool systems running properly.