Heating a hot tub
I was thinking of ways to reduce some of my electric costs and my hot tub came to mind. I'm assuming that solar-heating the water would be more economical and efficient than using solar-electric to run the tub's heater. I did a quick search and saw some hot tub kits which seem reasonable buy were basically just a collector and a pump. Since I live in Connecticut, wouldn't I need a closed-loop system? I use the tub all year long but it seems like I would have to drain it if the water from the tub was the same fluid pumped up to the collector.