This system is specially designed for household, villa and small area unit by our company. It consists of five parts such as flat panel, storage water tank, working station system (including expansion vessel, controller, circulation pump, pressure guage, valve, etc), circulation piping, support, etc. Features: 1) Material of inner tank: SUS304-2B stainless steel 2) Material of vacuum tube: QB-AL-N/AL-37/47-1500/47/58-1800 3) Material of outer tank: imported galvanized steel sheet 4) Insulation: polyurethane with super-thickness of 55mm 6) Material of support: imported aviation aluminum keel 7) Reflector: diffuse reflection sheet