CE, ISO, Keymark, five years warranty, 6 years export experience, manufacture since 2000 Solar water heating system detailsModel: QAL-BG-20 Description Painted steel Solar Water Heater Iner tank Stainless steel SUS 304(0.31-0.6)mm Outer tank Painted steel Insulation Polyuerthane foam Tank diameter 460mm Tube quantity 20 tube 58x1,800mm Tank capacity 200L Lighted Area 3.12 mx2 Bath(people 1 day) 4-5 Angle 27°-45° Set Including :1 water tank + 1 bracket +20 Evacuated tubes Specifications Solar Water Heating System.Unpressurized solar water heating system .Certification:CE, ISO9001 .5-15 years warranty 24 hours service Buying Guide: Model Quantity of vacuum tube Capacity for Water Tank Lighted Area Bath (pcs) (L) (mx2) (people/day) QAL-BG-18 18 180 2.82 3-4 QAL-BG-20 20 200 3.12 4-5 QAL-BG-24 24 250 3.74 5-6 QAL-BG-30 30 300 4.68 6-7 QAL-BG-36 36 360 5.36 7-8 Our company 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