Product Name: Double-Function Model Separate Solar SystemPlace of Origin: ChinaFeatures: 1) Collector size: 130mm x 130mm 2) Vacuum tube: 1,500mm / 47, 12pcs/sector 24 tubes/set 3) Vacuum tube: 1,800mm / 58, 15pcs/set, 20pcs/set or 30pcs/set 4) Tank:100L, 150L, 200L, 300L 5) Collector housing: 0.8mm stainless steel, frame 1.5mm stainless steel, insulation material, rock wool or polyurethane 6) Porcelain enamel inner tank, with copper coil inside, anti-freeze fluid do heat conversion to improve freezing-resistant, reduced scale, work normally under -30°C, super-big magnesium rod. Endures 21 bar pressure 7) Works normally if one tube damaged