Our two kids swim like fish and being able to give them something to do outside in the pool in December used to mean turning on our propane heater for the hot tub, as mid to upper 70s pool water temperatures didn’t excite them much! You mentioned a new “hybrid” solar panel kit that allowed for a better integration with our existing propane heater but also had much more efficiency on its own. Our propane heater works very well but with LP gas prices the way they are, I was more intrigued by the “high efficiency” panels. Boy, you weren’t kidding. I checked it today and at almost 85 degrees, this is about five to seven degrees warmer than ever before for this time of the year.