Yes, it works and is a very good idea. I have natural gas and the system actually paid for itself in approximately 3 1/2 years. I know this because I used my pool/spa for more than a year before installing the solar system and could make pre and post gas use comparisons for every month.
Two things have helped. First I have an ideal house orientation with a large roof area on the south side. Then, for a relatively small additional cost, I added almost double the square footage of panels, making the system even more efficient. Jack's Solar did the work. Jack is very experienced, did a terrific job for a very fair price and has an excellent warranty. One of the best contractors I've ever worked with.
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