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Features:1. All stainless steel frame and dark gray aluminum casing figure terseness and nice profile. Resort to module design and arbitrary combination, make her harmonious with the building perfectly.2. Using heat-pipe vacuum tube combined double-layer glass vacuum tube and copper heat pipe as one unit. 3. Absorption coefficient >92 % (AM1.5), Emission coefficient <8% (80), Vacuum     P<5x10-3Pa, Stagnation temperature >230. Freezing resistance: -354. Corrosion resistant silver brazed copper condenser. 5. Maintenance free, warrant your enjoying clean hot water for years.6. Easy plug-in installation with hermetic insulation layer promise the max. thermal reservation. 7. Perfect modular solar collector for domestic solar water heater system and commercial application.