solar panel hot water systems 1, CE, ISO certificates 2, OEM project 3, vacuum tube nonpressure solar water heater 4, 3 ... year Integrative Non-pressurized Solar Water Heater / KD-NPB solar panel hot water systemsMaterial:A) Inner tank: SUS304-2B ... / CE certificate 3 years international quality warranty for solar water heater, 1 year warranty for automatic controller Packaging: Vacuum tube / ...