I'm looking for informed suggestions for a new pump, calculators show huge savings for variable speed pumps. I have a 16 year old Sta-Rite, 2hp single speed Dyna Wave pump with 2" inlets. Pump is level with top of pool and runs are 50' to 60'. Main drain, 2 skimmers, and 3 returns. 16'x32' pool. I have it on a timer and run it 12 hour a day. Pool has a large Sta-Rite cartridge filter, chlorine generator, and auto-cover. I'm in Minnesota, so I only run it June through Sep. Thanks!