There are solar-powered hot tub heaters on the market, so maybe you should search the internet for a heater you are interested in. You can also warm your spa using solar heating pads and a dark, well-fitting cover for it. I suggest a dark cover because the sun’s heat gets absorbed by dark colors more than light colors.
This might be what you are looking for. It’s a Pool/spa cover that’s designed to trap extra solar energy into your spa. It’s a low cost option compared to a solar powered electronic system, although says it will heat it up 10-15 degrees so you’ll still need a primary heater.
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