80L-300L Non-Pressurized Vacuum Tube Solar Energy Hot Water Heater Technical Specifications : Inner Tank : SUS304-2B food-grade stainless steel - 0.4mm thickness , laser welding technology . Vacuum Tube : High efficient ALN/ALN-SS/CU coating , 58 x 1800mm vacuum tube - 1.6mm thickness , resist 25mm hail . Outer Tank : SUS201-BA stainless steel - 0.4mm thickness , free-welding technology . Insulation Layer : High density polyurethane - 50mm thickness , 72 hours efficient thermal insulation . Frame support : SUS 201BA stainless steel - 1.2mm thickness or Aluminum alloy 2.0mm thickness, anti-corrosive and anti-ultraviolet . M8 Stainless steel SUS 304 bolts and nuts . 58mm Silicone seal ring and dust ring Stainless steel SUS304 - 2.0mm thickness 3/4' or 1/2' inlet, outlet, air vent Optional accessories : Aluminum component reflectors Electrical heater Magnesium anode rod Assistant tank - Cold water filling tank Solar Controller Working principle Company introduction: Changzhou Imposol New Energy Co., Ltd. Is top ten in china for exportation.with more and more customers from Europe,Australia,Africa and Asia joinning us. With products' high performance and reasonable price backing us, With products'quality and company's credit supporting us,We believe that we are turning the world greener day by day-together! As an OEM factory in china,We specialize in manufacturing various types of solar water heater,solar collectors and vacuum tubes.Our product range include;compact and split,low pressure and high pressure vacuum tube solar water heater;thermosyphon;heat pipe,Upipe and SCHMV tube solar collector;flat plate solar water heater and solar collector. We have also designed and carried out some wonderful solar water projects for hospitals, schools,factories and familieS as well as our own design for new products. Why Choose US? 1.Our Product is economic and environmental; 2.Our Product is durable and has a long service life; 3.We have rich production experience.The quality of Product is reliable; 4.We have a perfect production process and strict quality control system; 5.We have perfect service system and will give you the best service. 6.Professional Production Line Certification Produce line Our solar products