About solar water heaters

In solar thermal, the key is to the sun's radiation is converted to heat.  As the solar scattered, must try to put it together, so a variety of solar collector is a key part of the device.  As the use of different collector types and their matching system is divided into many kinds of different names, such as the solar cooker for cooking, hot water is used to produce solar water heaters , solar dryers for drying materials for melting metal solar furnaces , and solar house, solar thermal power plants, solar desalination and more