Solar Water Heater
Solar water heating (SWH) is the conversion of sunlight into heat for water heating using a solar thermal collector. They are heated directly or via light-concentrating mirrors. They operate independently or as hybrids with electric or gas heaters.Types:- Two types of Solar Water Heaters are available; one based on flat plate collectors and the other based on evacuated tube collectors. Flat plate collector (FPC) based systems are of metallic type and have longer life as compared to Evacuated tube collector (ETC) based system because ETCs are made of glass which are of fragile in nature. Both these systems are available with and with out heat exchanger. They can also work with and with out pump. Systems with out pump are known as thermosiphon systems and those with pump are known as forced circulation systems.