Explain:
1 Heat focus apparatus: high efficiency heat focus vacuum
2 Inside the water tank: 0.5mm 304-2B (food-level stainless steel)
3 Outside the water tank: stainless steel
4 Material of heat preservation:55mm import PU or 60mm import PU
5 Pressurize loop: macromolecule silicon rubber
6 Top of the water tank: thick aluminium alloy