Product Name: Assistant Tank for Thermosiphon Solar Water Heater Certification: CE, ISO9001 Interior Material: Stainless Steel Pressure: Pressurized Structure: Compact Type Max. Capacity: 51-100L Transport Package: Carton Package Specification: 10L Origin: China Product Description Assistant tank for thermosiphon solar water heaterAssistant tank is specially designed for non-pressure and pre-heat solar water heaters.It works automatically without manual water refill.avoiding water overflow from main storage tank.With an assistant tank the solar water heater is always full of waterSpecification:Capacity :3L;5L;8L;10l ect.Inner tank : Stainless steel SUS304Insulation : High density polyurethane foam layerOuter tank : Color steel or stainless steel SUS304Valve shaft :High quality brassSeal: Anti-aging silicon seal