I've got a 1HP Hayward A.O.Smith pump model c48k2n143b1 sp1607z1m which is now cycling on and off (I think it started last week -- that's when I noticed it), maybe it's hitting thermal shutoff? It never did before, but now the label looks like labels do when the metal they're on gets too hot. All brown and crispy on the edges. I don't know how old it is, I don't see a year of manufacture on it, but it came with the house which I've now had for 5 years. I'm betting it's getting old and something like a bearing is giving out leading to thermal shutoff. Is it time for a new pump? I think I could get a variable speed and save a load of energy costs. I've been running it 24 hours a day and the water had been looking even nicer than previous years, but now that the pump is cycling, it's starting to cloud up.
If I stick with the Hayward line, I think their energy calculator says that pretty much any variable speed would pay for itself in a couple of years. Is there a practical difference between them? A reason to get the EcoStar or TriStar VS or MaxFlow VS or Superpump VS (aside from purchase price)? What should I be considering when looking at the different models?