1)Inner water tank shell all are made of SUS***2B food grade stainless steel plates, welded by argon arc. Water is pure and drinkable. Inner tank thickness is 0.4mm, the highest thickness for SPO direct insert lower pressure can be 0.8mm.
2) Heat insulation of water tanks adopts polyurethane foam and the thickness is *5mm
3) Silicon rings to connect and seal them
4) The tubes and supports are adjustable. The power bearing is average and can assure the vacuum tubes to use for a long time
5) Whole glass vacuum tubes adopt super hard borax and silica glass
6) Absorption rate: =*3%, thermal radiation rate: =6%
7) It resists *5mm hail and the using life can last *5 years
8) Temperature when exposed to sun without water: **0,2.5 hours to boiling point if using single tube
9) If you use electrical appliances to aid heating and to switch off the power supple before bathing
*0) Please test the water temperature before using, in order to avoid scalding.