... Accessories Workstation system, Electric heater, E-Parts box, thermostat, Switch, Anode magnesium bar, T/P valve, Relief ... glass vacuum tube.4) Modularized collector, arbitrary combination with architectural structure, adaptable to either slope or flat ... 3) Insulation Layer: High-density polyurethane Integrated-foaming with twice slaking treatment, preserves water temperature constantly4) Pressurized ...