... welding technique, Thickness 0.41mm 2) Out shell: Color steel with PVC layer , advanced welding technique, Thickness 0.45mm3) Corrosion resistant ... , 24, 30, 36tubes 7) Capacity: 100-350 litersSolar water heater Remark: 1. Solar heat storage tank diameter(mm): 410/4602. Thickness, insulated(mm): 50/603 ...