1. There is no water in vacuum tube, the system can work as usual even if there is one tube broken
2. Tank can bear the pressure of 0.7Mpa
3. Test pressure is 1.0Mpa
4. You still can get hot water on the second floor if you install solar water heater on the floor
Material
1. Inner tank: SUS304/2B 1.2mm
2. Outer tank: zinc steel plate 0.4mm/PVDF
3. Insulation layer: PU
4. Vacuum tube: QB-CU-AL-NAL-58*1800
5. frame: zinc steel painted plate 1.5mm/aluminium sheet 1.2mm
6. It is with T/P valve, electric heater and Mg rod