TES is professional and the largest manufacture in China producing Solar Water Heaters, Flat Solar Collectors, Oil/gas heating boilers. Our products has CE, RoHs , Keymark ,(EN12975) certificates. All our products with European technology and Germany standard. TES products offer customer 7 years guarantee on collectors and water tanks. We do 100% export to all over the world. Except our TES brand products, OEM orders and customers designs are our main way to develop overseas market. Welcome you contact us for more info. and prices.Please read the details of our product as follows:1)water tank : available model 120L,160L,200L and 300Lwe quote two types of water tanks: one prices is in aluminium outer cover, the other prices is in stainless steel outer water tank. An inner part of the water tank is all the same. 2)collector 1.5�� 2�� 2.5��and 3��As for collector, the market has two different absorbers占�pper and aluminium.With copper has 3 different surface coating: blue selective ,black chrome and black paint.With aluminium surface coating:black paint.