Advantages: 1. Can he operated completely automatic if connect with intelligent controller. 2. Simple structure, easy plug-in installation, can be installed both on flat and inclined roof, and can be used with an auxiliary electric booster as to provide tot water without sunshine. 3. Superior heat preservation ensured by one-off molding polyurethane foam with thickness 50 65mm. 4. Suitable for camping residences, hotel. 5. Stable and reliable performance, well wind resistance. 6. Meet the mankind healthy bath standard: The material of inner tank is SUS304-2B stainless steel plate; The silica gel ring sealing has a long life against the erosion and it is not harmful to health 7. With high efficient vacuum tubes as solar collector, absorption percentage 91--94% 8. Tubes size: Diameter 47mm and length 1500mm; 9. Very easy to install on the roof. 10. Water tank housing is made of stainless steel looks more beautiful and substantial. 11. Inner water tank is made of food grade stainless steel 304, welded by argon arc. 12. Water is pure and drinkable. 13. Warm keeper of water tanks are polyurethane frothed, thickness is 40-60mm. 14. Water in the water tank is not under pressure. 15. High quality stainless steel 202 (or aluminum alloy) bracket are strong and windproof. 16. Tube quantity is optional, from 15 tubes to 30 tubes