Introduction: 1.TANK Outer tank material:High quality painted steel (White) plate thickness 0.4mm; Inner tank material:SUS304-2B food grade stainless steel plate thickness 0.31mm; Heat preservation:72 Hr; Insulation layer:high density polyurethane foam thickness 55mm ; Holes:4 holes,water inlet and outlet,electrical heater,vent.2.Vacuum tubeModel:47mm*1500mm , 58mm*1800mm , 58mm*2100mm; double ...