What is Evacuated Tube Technology?
IST all-glass evacuated collector tube has a configuration of two concentric borosilicate glass tubes, the selective absorbing surface is coated on the outside of the inner glass tube using magnetron sputtering, the jacket between the cover and the inner glass tubes is evacuated and permanently scaled off. Evacuated collector tubes can be widely utilized due to their high efficiency, low heat losses, long lifetime and low costs. The heat loss coefficient of the water heater is less than 1.0 (Wm -20 C -1 ), the solar water heater can work efficiently all the year round even in cold climate. The tilt angle of the solar water heater is in the range of 0 o to 75 o so it can be installed from the Equator to high latitudes, and suitable for the sloped roof of a house.
