Biggest downside to solar is recovery time. Even 1/2 coverage will get you into the 80s with decent exposure. I boosted my solar from about 55% to well over 75% and saw a 10 degree rise on one day, something we never got before.
But, basically once you pay for the panels and plumbing, its free heat. If you have been swimming with no heat, you will LOVE your solar.
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