I have a 1.5hp Pentair Whisperflo, single speed. It's 5 years old, no real problems. I'm thinking of buying a "spare" for when it dies so I can do a quick swap. Can a 2 speed whisperflow be "swapped" without much rewiring effort? I like the idea of running twice as long at half the speed, but don't want to waste the extra $300-$400 for 2 speed if it's not worth it. No water features, and probably getting a robot soon.