All of our products are directly from Factory. Price are much more competitive and quality are much easier to control. .Unpressurized solar water heating system .Certification:CE, ISO9001 .5-15 years warranty .OEM Model: QAL-CG-18 Description Painted 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 18 tube 58x1,800mm Tank capacity 180L Angle 27°-45° include : 1 water tank + 1 bracket +18 vacuum tubes What are your main products? Our company is factory in Tongyuan Industrial Park,Jiaxing City, can provide you Split pressurized solar water heater system (150L,200L,300L,400L,500L) Compact pressurized solar water heater system (150L,180L,200L,300L,360L) Compact Unpressurized solar water heater (150L 180L 200L 250L 300L 360L ) Compact pressurized Flat panel solar water heater system Solar water heater collectors More details,please email us. 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