... channel 3year guarantee CCC,CQC,ISO,CE approved OEM compact solar water heater -natural circulation-We supply several types of integrated non-pressurized ... steel solar water heater Detailed Specifiations: 1. Inner tank: 0.4mm SUS304-2B stainless steel 2. Outer tank: 0.31mm colored steel 3. Evacuated tube ... , width: 100mm, thickness: 1.5mm7. Angle: 38 or 45 degree evacuated tube solar water heater