... type, double /single / none cooper coil type 1. Tank capacity: single copper coil: 100LSingle/double/none copper coil ... : 150L, 200L, 250L, 300L, 400L and 500L2. Inner tank diameter: 410mm (100-200L) 500mm (250/300L) 650mm ... 5mm (400/500L)6. Material and thickness of outer tank: colorful steel plate/0.6mm7. Thickness of insulation: ... (100-200L); 3KW (250-500L) Hot water storage tank& Pressurized tank