Types of solar water heater
Flat Plate Collectors
This solar collector is made of an aluminium body and has a toughened glass sheet on the top. The heart of the collector is a copper absorber plate which is selectively coated for better performance. This plate absorbs the maximum possible heat from the sun and passes it to the water. The collector box is well-insulated to prevent any heat loss.
Evacuated Tube Collector
An evacuated tube acts as an absorber in this type of solar water heater. Each evacuated tube consists of two glass tubes with a vacuum in between, which acts as an excellent insulator. The incident solar radiation falling on the tube passes through the outer transparent tube and strikes the inner tube. It absorbs the heat energy and then passes it to the cold water flowing in the tube.