The best solar water heating systems can now dump their Achilles’ Heel: the CO2 waste coming from using mains electric powered pumps for their solar panels. Here’s how: this invention, a PV powered zero carbon solar differential controller to turn a brushless DC pump on and off when the water in the panel is hot enough to collect. Why was it not done before? Save energy with this amazing invention – it boosts carbon savings in solar water heating systems by 20%. Solar water heaters can now …... more