Detailed Description  all glass solar collector 1. with high quality vaccum tubes as solar collector,absorption percentage 91%-94% 2. module is made of galvanized steel ,or stainless steel 304,beautiful and durable  3. the water in the indoor-water tank is under pressure ,and the system work with not water circulating pump 4. working pressure:0.6Mpa 5. heating pipe in the vaccum tube tubes are made of high quality copper ,with our special design ,more efficient 6. if one vacuum tube is damaged ,the whole machine can work normally ,as no other part is influenced ,replacement is convenient . 7. warm keeper of water tank in the module is asbestos and polyurethanes frothed ,thicness 50mm 8. high quality stainless steel 202(or aluminum alloy)brackets are strong ,stable and windproof  9. tube quantity is optional ,from 15 tubes to 30 tubes