Looking for a simpler solution [Martin] came up with his own solar pool heater for under $100! He’s copied the basic design of a solar pool heater but managed to do it using fairly cheap parts ...
The build in question is a fairly compact design, roughly shoebox-sized when fitted with its six-turn coil. Running off anything from 12 V to 48 V, the heater put out at a massive 1.4 kW in testing.
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