How it works? Solar Water Heating systems use solar collectors fastened to your roof to heat up the water which is stored in a hot water storage tank. A boiler or electric heater can be used as a back up to heat the water during cloudy days. ENERGOOD EA heating systems are available in various tank sizes and collector configurations to suit a variety of domestic and commercial applications. The domestic heating systems range between 100 Liters and 300 Liters. For commercial applications, we provide systems with a volume up to 2000 liters. Models Open-loop systems (or direct heating), heat the water directly through the collector. Closed-loop systems (or indirect heating), heat a transfer liquid through the collector which in turn heats the water. This type is suitable for mineralised and brackish water. Mounting Our heating system can be either ground mounted or roof mounted. At request, we can provide roof mounted systems with tank positioning inside the roof.