As the days grow shorter and the sun hits my pool less and less, my thoughts have turned to buying a heater. Solar won't work in our situation, and gas and electric resistance are too expensive to operate, so I think a heat pump is our best option. I would love to hear any opinions (good or bad) people have about their heat pumps. My pool is saltwater, so would a heat pump with titanium exchanger be necessary? Or is that just a gimmick? Does "more expensive" mean "better" in heat pumps? Do you need to service them regularly, like my house heat pump, or are they pretty low maintenance and trouble free?

Thanks for your help.
Alison