Type:Evacuated Tube Pressure:Unpressurized Circulation Type:Direct / Open Loop (Active) Heating System:Thermosyphon (Passive) Connection Type:Direct-Plug Installation:Freestanding Housing Material:stainless steel or galvanzied steel Certification:CE,ISO,KEYMARK,SRCC,INMETRO Capacity:200 Material Of The Inner Tank:SUS304-2B Imported Food Grade Stainless Steel Material Of Outer Tank:Galvanized Steel Alloy Or Stainless Steel Frame:Galvanized Steel Alloy Or Stainless Steel Or Aluminum Alloy Heat Preservation:72-80 Hours Vacuum Tube:Vacuum Tube 58*1800 Or 47*1500 Tube Material:high borosilicate glass Coating Of The Tube:Coating Of The Tube Insulation:Polyurethane Foam Lifetime:More Than 15 Years Usage:Home ,House, Project,Swimming Pool, School,Government Show More