... quality warranty: 5 years for whole system and 15 years for vacuum tube.Non-pressurized solar energy1.solar water heater with CE,3C, ... , assistant tankLogo: OEM, co lour printing /stickerFeature: 1.Solar water heater with CE,CCC,ISO ,CNAL certificate2.Special high quality ... .High quality copper coil for efficient heat transferring and long life span of the solar water heater4.Exquisite workmanship to ...