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I have a Pentair 150M CH MiniMax milivolt heater that won't shut off after its been running for a while. About 4 years old. Any help would be appreciated.

Hello, I have a Pentair Optiflo 347986 1.5 HP single speed that I need to replace. I have read that a 2 speed (less HP) would be better and more energy efficient than the single speed 1.5 HP I currently have for my 24 ft 52" round above ground. I see the Optiflo 347990 1 HP 2 speed on Amazon...