Purwat

Flat Plate Collectors (FPC) Using the greenhouse effect, the Flat Plate Collector converts solar energy from the sun into heat energy, which then is transferred to the water system in residential and commercial houses. The water is then used for bathing, washing, cooking, or cleaning.
Design 
This collector comprises of a large sheet of the copper or aluminium absorbing plate. They are painted black so that the surface absorb as much solar energy as possible. Tubes or pipes (made of copper), which transfers the heated fluid, are lined and soldered across the surface of the absorber plates. As the plates are heated, the heat is absorbed by the fluid in the pipes, which gets circulated in the house. To minimize heat loss the absorber plates and pipes are enclosed in an insulated metal or wooden box. Inside the insulating material is a sheet of glazing material that does not significantly absorb the thermal energy.

 Benefits
Low Maintenance: Flat Plate Collector functioning requires less maintenance to keep it running effectively. The collector when installed outside is more reliable to withstand harsh weather conditions.
Reliability: The solar Flat Plate Collector is more effective at delivering the desired quantity of heated water at the needed temperature. This is one of the reasons why it is highly in demand in many houses.

 Easy Construction: The construction is easy because of the simple stationary design. The collector box is designed in a way to keep the water sufficiently heated.