which are accessible to the user in the embodiment shown the iron comprises above the plate 7 a recess 18 made in the housing forming the handle 19 of the iron the knobs 16 17 are fixed vertically in the cavities 14a 15a of the elements 14 15 and project into the recess 18 these control knobs 16 17 are thus easily accessible to the users 39 fingers the first element 14 is mounted so as to slide on the plate 7 in the longitudinal direction of the iron this element 14 comprises an inclined ramp 20 interacting with a bearing surface 21 see fig1 and 6 of the pipe 4 in order to control the displacement of the latter in a direction perpendicular to the plate 7 against the action of a spring 22 pushing the pipe 4 towards the vaporization chamber 2 the user can thus regulate the flow of water into the vaporization chamber 2 the second element 15 see fig1 and 5 is mounted so as to slide on the plate 7 in a direction which is transverse to that of the first element 14 this element also comprises an inclined ramp 23 formed by a groove in which a finger 24 belonging to a part 25 integral with the pipe 4 is engaged thus the displacement of the element 15 also controls the displacement of the pipe 4 in.