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Solar Water Heater Evacuated glass solar collectors are directly plugged into storage tanks and such systems occupy less space. Water directly circulates inside the evacuated glasstubes and such systems gain the highest efficiency. Features: 1) Highest efficiency 2) Simple configuration 3) It is the most reliable and economic system when manual controls are acceptable 4) Automatic controllers (CPU based) can be applied to these systems 5) Mechanical level control auto tank (felting ball based) is optional 6) Electrical heating element is optional 7) Sacrificing anode is optional 8) Vacuum tube style: AL/N/AL Specifications: 1) Vacuum tube counts: 15, 18, 20, 24, 302) Angle: 42oC 3) Aperture area: 2.10-4.23m2 4) Theory volume: 150-310L 5) Tube size:58 x 1,800mm Material: 1) Inner tank: SUS304-2B stainless steel 2) Outer tank: aluminum-zinc coated steel 3) Frame: Galvanized steel 4) Isolation material: polyurethane Sunshore Solar Water heater 15 years lifetime, economic for family use hot water 1. Sunshore solar water heater China's top five brands 2.Certificates:CE CCC ISO9001 ISO14001 SOLAR KEYMARK 3structure Science 4.High quality Advantages: 1. It operated completely automatic if connect with intelligent controller. 2. Simple structure, easy plug-in installation, can be installed both on flat and inclined roof, and can be used with an auxiliary electrical heater as to provide tot water without sunshine. 3. Superior heat preservation ensured by one-off molding polyurethane foam with thickness 55 / 65mm. 4. Stable and reliable performance, well wind resistance. 5. Meet the mankind healthy bath standard: The material of inner tank is SUS304-2B stainless steel plate; The silica gel ring sealing has a long life against the erosion and it ie not harmful to health. we are gold supplier and certified shop on Alibaba here, all products on line are authentic, you can select what you like, or tell us what you want, we can offer you all what you want. trade marks shown are only for yr reference.