This description is for solar powered water heater systems. These systems are designed to provide an efficient and cost-effective way to heat water using the power of the sun. They are easy to install and require minimal maintenance. With a solar powered water heater system, you can save money on your energy
From Wikipedia
Solar water heating (SWH) is heating water by sunlight, using a solar thermal collector. A variety of configurations are available at varying cost to provide solutions in different climates and latitudes. SWHs are widely used for residential and some industrial applications.