CE, ISO, Keymark, five years warranty, 6 years export experience, manufacture since 2000 Solar water heating system details Model: QAL-BG-30 Description Stainless steel Solar Water Heater Iner tank Stainless steel SUS 304(0.31-0.6)mm Outer tank Stainless steel Insulation Polyuerthane foam Tank diameter 460mm Tube quantity 30 tube 58x1,800mm Tank capacity 300L Lighted Area 3.12 m2 Bath(people 1 day) 6-7 Angle 27°-45° Set Including : 1 water tank + 1 bracket +30 Evacuated tubes Specifications Solar Water Heating System .Unpressurized solar water heating system .Certification:CE, ISO9001 .5-15 years warranty 24 hours service our company's website : www.china-nicesolar.com Our Add:Industrial Park of TongYuan Town,Haiyan,zhejiang Province,China. Fax:0086-0573-86617722 E-mail:qalsale3@china-nicesolar.com Skype: Mindy