Forced pumps systems are the best solution to have warm/ hot water in all times since it uses a clean energy source, which is the solar energy. These systems have pumps in which an electronic regulation system manages its work. The collectors which are installed on the roof are used to absorb the energy from the sunlight and transform it into a cold-water tank.
The temperature of the cold water becomes higher due to the existence of an electronic regulation station that transforms the heat to the heater tank. There is an electrical backup system used to complete the process of heating water, only if needed.