1. Inner tank adopt steel sheet with outside coating the porcelain enamel for 4 mm thickness. It won't have water scale, can endure the acid and alkali, high temperature and high pressure too.
2. The heat exchange is made of red copper, each can withstand the pressure for 1.0Mpa.
3. The water can be conducted by the pipe rapidly
4. Since there is no water in the vacuum tube, so the tube won't be broken easily in winter.
5. It is specially suitable for small villa and flat and combined with the architecture perfectly
6. It can be combined with existing pipeline;
7. It can still operate even one of the tubes breakages