... . 2) It takes the advantage of the tap water's pressure. More pressure, more comfortable. 3) ... It can produce hot water with constant temperature, it is safe and comfortable to ... use. 4) The water can be heated rapidly, so it can produce ... 2) Vacuum tube: 58mmx1800mm, High borosilicate glass, vacuum tubes, 3) Outer tank: Pearly steel plate,Galvanized steel ...