Compact unpressurized Solar Water Heater Description SKYLIGHT Compact unpressurized Solar Water Heater It is one of the most common used solar water heating system for household, hotel, hospital, project application etc. It has simple structure and working principle but is most economical. It is easy to be installed on the roof indeed as top as possible to keep water head and get enough water flow pressure, cause the compact system has non-pressure, water flows depending on gravity water head. This system matched with vacuum tube solar collector. Water flow inside completes a circulation by its own without pressure, this process is called heat thermosiphon. Key Features 1. Inner tank material: Standard stainless steel 304-2B, thickness up to 0.4mm. 2. Outer shell material: Stainless steel, thickness up to 0.31mm. Outer shell material: Galvanized Steel coated with corrosion-resistent layer, thickness up to 0.45mm. 3. Heat insulation layer: 50-60mm integral foam polyurethane. 4. Frame: Galvanized steel coated anti-corrosion layer, it can be settled on inclined and flat roof. 5. Non-pressurized water tank: Test pressure up to 0.5MPa, working pressure 0.6MPa. 6. Accessories such as 1% screws, gasket rings and connectors are free. All installation and operation documents are free. 7. Reliable compact system with good appearance frame, high efficient collector and excellent performance. Specifications Tank capacity (L): 100L-250L Tube specification (Diameter x Length) (mm): Dia.47 x 1500, Dia.58 x 1800 Tube quantity: 18-36 pcs Tube vacuum degree: 5 x 10-3 Tube absorptivity >0.93 Tube heat loss/ emissivity <0.08 Tube heat transfer power: 26000Kw/m2 Working pressure (Mpa): 0.6 Anti freeze(): -20 C Anti hail (diameter mm): 25mm Reflector Area (Made of Alum alloy): 3.4m2 Anti-wind support frame: 26.5m/s 10 grade Material of outer tank: steel coated with AL & Zn Insulation (mm): polyurethane 55mm Electronic heater (fixed in the water tank): 1100W/ 220V/ 50Hz Dimensions of inlet and outlet of water: GB1/2''