Hey Guys - I thought some of you here may have tackled this kind of DIY project before. My pool's hot tub (the kind that is separated from the main pool by a spill over wall) has no heater. The old gas heater died on the previous owner. When I bought the house it had no heater. The hot tub is small, seats 3-4 people. Measures about 6'L x 4'W x 4'D. I have been thinking of a building a solar heating system. Behind the pool is a steep hill with what I believe to be the right exposure for solar. The base of the hill is also where the pool filter and pump system is located. I want to connect a solar heating system to existing equipment (where the previous gas heater was connected). I have started online researching, seen a few setups that had great results. Has anyone done this? Any advice? Specifically, I'm talking about solar heating the water in black garden hoses style system or similar setup) and not solar electric panels.