... Tube Solar Water Heater Vacuum tubes assimilat the advanced 12 layers of apattering deposition of rivalent element tevhnology, highborosilicate ... has an unique effect of thermo, with its temperature up to 400 degree of idle sunning, performing ... It is suitable for the solar project, widely used in the hotels, schools, hospitals and family, etc. ... °, 45° Non-pressure Vacuum Tube Solar Water Heater System