Looking for a simpler solution [Martin] came up with his own solar pool heater for under $100 ... temperature controller or even an Arduino to make it even better… but it sounds like it works ...

Today, you can choose between super-efficient, professionally installed collectors and less-expensive DIY-friendly solar hot ...

large efficiency gains like this can be low-hanging fruit to even more home energy savings than solar alone provides on paper. Effectively the water heater becomes another type of battery in ...