we are trad company ,but we have our own factory,specializing in the export of the above items .such as,solar water heater ,glass vacumm pipe ,three high vacuum pipe and so on .our solar water heater factory have 18years old .solar water heater factory have 250 works ,produce solar water heater 11000-13000units per day,solar vacuum tube 10000-12000 tubes per day,meanwile have ISO and CE specificationsTo give you general ideaa of our products .if you are interested in other model please told me ,we shall send you quotations once we get your specific enquiry.