Spouse and I are debating whether it's possible to raise the pool temp by 50F (or more). Is the amount of heat a pool heater is capable of generating essentially endless? Or is too much heat lost into the cold air and ground surrounding the water, so (for example) you can reasonably expect to raise the temp by 20F, but no more?
We are not debating whether this is too expensive to consider ... only whether it's actually possible. This is using a "standard" gas heater, not 10 gas heaters online together or some other fancy set-up. Spouse believes we could turn the pool into a gigantic hot tub if we left it running long enough, regardless of the weather. I want to know whether we could keep it open when the temp is below freezing, should we someday have a sauna and want a cold plunge.