Thermo-Siphon copper coil in the water tank all glass vacuum tubes. 1. Material of Inner Tank: SUS304-2B Stainless Steel With 0.4mm thickness 2. Material of Outer Tank: SUS304-2B Stainless Steel With 0.31mm thickness 3. Copper Coil: Diameter: 12mm; Thickness: 1mm 4. Insulation: Polyurethane foam with 55mm thickness 5. Magnetic-controlled Al-N-Al splash all glass evacuated heat-collecting tubes(size: 58mm*1800mm) 6. Material of Support: Stainless Steel Profiled Bar with 1.2mm thickness 7. Using the electric heater system, it can be lasting used in the cloudly, rainy and snowy days. 8. Packing: Exporting  carton

Vacuum tube Thermo-Siphon Solar Water Heater