Vacuum tube with seletion coating. High efficient to collect the energy from sunshine. The circulation of the hot water is automatically achieved using the natural thermosiphon principle. Heated water rises naturally through the vacuum tubes and enters the storage tank. When this happens, cooler water at the base of the storage tank is forced out and flows down to the bottom of the vacuum tubes. This cycle is continuously repeated while the sun is shining. The system is backed up by a thermostatically controlled electric element. An electric backup element cuts in on those days when the sun refuses to shine, so there is always plenty of hot water on tap, no matter what the conditions. The 50L small service tank automatic increase water to storage tank. Then the water is full of storage tank in any conditions.

Use condition: This model is installed on roof. From roof to Bath room, the water fall down free under the fluence of gravity, so if the distance from roof to room less than 6 meter, then we will need a hot water boost pump to assistant the water fall down fast.

Features:
1) Reliable and efficient with twin-glass solar tubes
2) Easy plug-in installation
3) Outer tank material: Stainless steel 304 or AL-zinc coated or color steel sheet
4) Inner tank material: 0.5mm thick SUS304 food grade
5) frame material: 1.2mm stainless or color coated
6) 50 - 65mm polyurethane foam insulation layer