Features:

1) Structure:All glass coaxial dual-tube, an inner tube into a dual-glass outer

Tube

2) Material:High borosilicate glass 3.3

3) Thermal collecting efficiency up to 40%

Specification:

Solar energy collecting tube

Adding one more complete glass tube in the mormal tube, raising the heating efficiency by decreasing the water content, not the heating area.The heaating efficiency can improve 30%by this way.