Active Solar Thermal Water Heating Systems: Learn How They Work by Andy Culberson on September 6, 2012September 6, 20121 Comment Years before solar photovoltaic panels started appearing on residential roofs to generate electricity, a rooftop collector box for an active solar thermal water heating system was not an uncommon sight. Heating water is one of […]Read More Filed Under: Solar– Water Heaters Tagged With: Cleveland– efficiency– Ohio– save energy– save money– solar thermal water heater system