The evacuated tube solar water heater is one of the most popular solar thermal systems in operation. An evacuated solar system is the most efficient and common means of solar thermal energy generation with a rate of efficiency of 70 per cent. As an example, if the collector generates 3000-kilowatt hours of energy in a year then 2100 kilowatt hours would be utilized in the system for heating water (solar water heater). Solar water heaters installation in Hyderabad .The rate of efficiency is achieved because of the way in which the evacuated tube. solar water heaters manufacturer systems are constructed, meaning they have excellent insulation and are virtually unaffected by air temperatures. The collector itself is made up of rows of insulated glass tubes that contain copper pipes at their core. Water is heated in the collector and is then sent through the pipes to the water tank. for more info visit here: - https://greentekindia.co.in/