solar thermal collectors 1.CE,ISO9001 2.reliable permance 3.easy installation solar thermal collectors Specification:1)Outer shell material: Aluminium alloy2)Inner material: Red copper channel3)Adjustable installation angles: 30°, 45°,60°4) Heat-Collecting tube specifications: 47x1500mm5) Anti-Hail: 25mm6) Bracket: Aluminum alloy7) Anti-Frozen: ≥-35% solar thermal collectors