CE, CCC, RoSH, ISO9001: 2000 approval Product Description Product Description Solar hot water heater Detailed Product Description Specifications: 1) Inner tank material: SUS304- ... tube: 15, 16, 18, 20, 22, 24, 26, 28, 30 and 36 pieces of tubes are available, three high vacuum tubes ... ) Prompt delivery 4) Environment-friendly system 5) Welcome Small order and OEM order 6) Easy to install