He’s copied the basic design of a solar pool heater but managed to do it using ... a PID temperature controller or even an Arduino to make it even better… but it sounds like it works quite ...

There are a lot of DIY solar water heater designs out there ... from energy savings indoors to making your backyard pool more sustainable. The water heater was an experiment, and @sergiyyurko2110 ...

Finally, this guide from Adrienne Carrie Hubbard of Crafty Little Gnome explains how to make a DIY solar pool heater using a hula hoop, pool noodle, and black trash bag.