I created a pool heater that is capable of heating the pool water over 35 degrees on a 65 degree day using only the sun, some tubing, and a pump. Materials cost under $200 at Home Depot. It was a terrific DIY project that is far more effective than the solar heaters you’ll find online and for MUCH less money.
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i recently built one but don't have the plexiglass on it. Would you say that plexiglass makes a difference?
Well done I might have to give this a try. I have wanted a warmer pool every year.