The first commercial solar water heater is patented.
https://www.sunpad.solar/wp-content/uploads/2019/08/sunpad-solar-water-heater-logo-2019.png00Webpunks Supporthttps://www.sunpad.solar/wp-content/uploads/2019/08/sunpad-solar-water-heater-logo-2019.pngWebpunks Support2018-12-14 15:29:272019-06-19 15:21:141890s – First solar water heater