We as Sunrain Solar have supplied solar water heaters and solar collectors for 10 years. 1. non-pressure vacuum tube Solar water heater. (One pipe inlet-outlet, Two pipes inlet-outlet) 2. Pressurized solar water heater. (with Copper Coil/ with Heat Pipe/ with Double Tank) 3. Heat pipe solar collector. 4. U pipe solar collector. We make high quality as soul of products. So we have become China biggest SWH exporter. Even though, we are still trying our best to improve ourselves. Now we are looking forward to bond relationship with wholesalers all over the world. If you have any interesting on our company and products, please feel free to contact with me. Choose Sunrain, Choose the best.