Features Specifications:solar water heater   Our products can be classified as follows:  1. Pressurized Solar Water Heaters, including Separated, Integrated, and Balcony ones.( attached catalogue is for your ref.)  2. Non-pressure Solar Water Heaters, which is also named Direct Insert Solar Water Heaters. ( attached catalogue is for your ref.)  3. Air-sourced Heat Pump Water Heaters. (catalogue is available once you ask for) 4. Solar Collector Modules: there are three types. ( see the attachment)  a. Common Module, which is non-pressure  b. Pressurized Module  c. Flat Module 5. We also manufacture vacuum tubes which can be classified in 3 types:  a. common vacuum tube: there is water in the tube, makes the heating quickly and the cost is relatively low. but it is non-pressure, and if one pc is broken, then the whole system will be out of work.  b. 3-high vacuum tube: there is no water in the tube, and it is pressurized. If one pc is broken, the other parts can also in normal operation. but the price is higher.   c. spaceflight vaccum tube: the only difference between 3-high vacuum tube and spaceflight vaccum tube is the coating, the absorbing capacity of the spaceflight vacuum tube is more efficient than 3-high ones. But the price is also higher.