The characteristic: 1 it takes the advantage of the tap waterf+s pressure.More pressure, more comfortable. 2 the water can be heated rapidly, so it can produce the high quality hot water. 3 it can produce more hot water than the general types because it is not restricted by the volume of the tank. The details of material 1 inner tank : stainless steel sus304-0.6mm 2 vacuum tube : qb-al-n/al-58-2000 3 out tank : painted steel-0.4mm, stainless steel sus304-0.4mm 4 frame: coated galvanized steel sheet-1.5mm;stainless steel sus430-1.5mm. 5 the material of insulation:polyurethane 50mm 6 the reflector:aluminum component : al 99.85% surface oxidation. 7 copper coil : ft12mm, thickness 0.8mm. G.W. 176kg