Compact non-pressure solar water heater Tech data: 1. Inner water tank:stainless steel, sus304-2b, ss316l; thickness, 0.31-0.51mm. 2. Outer water tank:color steel or stainless steel;thickness, 0.40mm. 3. Insulation layer:polyurethane foam;thickness, 30-60mm. 4. Frame:galvanized steel; aluminum alloy; stainless steel; angle, as your requirement. 5. Vacuum tubes:aln/ain-ss/cu layer;47-1500 or 58-1800. 6. Tank capacity:70-400l. 7. Assistant tank heating element, mg rod, reflector and controller can be provided. Characteristic: 1. Operated completely automatic if connect with intelligent controller. 2. Installed both on flat and inclined roof, and can be used with a electric booster (heating element) as to provide hot water without sunshine. 4. Suitable for camping area, holiday residences. 5. Stable and reliable performance, well wind resistance