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correction: "less work* than"...

The chemistry thing doesn't bother me. to me that's less worth than: isolating the spa valves, turning on the heater, waiting an hour, then turn it all off when done. I'm already doing chemistry for the pool. What about one of these electric "heat pumps"? Supposedly they are much more...

Hi, I have a combined pool/spa with spill over. The pool and spa have separate plumbing coming in and going out, but they both come together into the common pump/filter. there is no heater on the system My primary goal is to heat to the spa to 104 or so degrees (hot tub temperature) in winter...