Solar evacuated tube: 3.3 high borosilicate glass
Inner tank: stainless steel , 0.5mm thickness
Outer tank: color steel
Tube colors: blue or black
Insulation layer: 55mm polyurethane foaming
Number of vacuum tubes: 15, 18, 20, 24 and 30
Diameter:
Outer tank: 420 and 470mm
Vacuum tube: 47 and 58mm
Vacuum tube length: 1,500 and 1,800mm
Absorb rate: ≥93%
Thermal radiation rate: ≤6%
Heat-resistant: 25mm
Heat preservation: 8 hours