Solar Water Heater

Solar water heater use the sun energy to heat water during the day. This hot water is stored inside an insulated solar hot water tank for use whenever required. The sun rays have enough energy to heat water up to 55°C to 70°C which is more than sufficient for bathing and washing purpose in bathrooms and kitchen.

With no maintenance requirement, solar heater provides a low cost long term solution to getting hot water. For cloudy days, solar water heater have a inbuilt electric heating element for backup. Basically, solar water heater do conversion of sunlight into renewable energy for water heating using a solar thermal collector.

Solar water heater comes in two major technologies - FPC solar water heater and ETC solar water heater.

ETC Solar Water Heater

Evacuated Tube Collector (ETC) acts as an absorber in the solar water heater. Each evacuated tube consists of two glass tubes having vacuum in between which is an excellent insulator.

The incident solar radiation falling on the tube passes through the outer transparent tube and strikes the outer of inner tube. It absorbs heat energy and then passes to the cold water flowing in the tube. An evacuated tube technology based solar water heating system is most energy efficient and cost effective that are best suitable for home use.