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The adjustment of the intensity of evaporation is conducted by means of the variation in the relative position between the upper end (6") of the wick (6) which absorbs the products of the vessel (2) and the electro heating resistors (5) which favour the evaporation of said product, and more specifically keeping static said resistors and the assembly constituted by the vessel (2) and the wick (6) being displaceable. For this, said vessel (2) with any configuration, is provided with at least one revolution sector (7) in which a helicoidal groove (8) is established, of great pitch, operating as thread for the axial displacement of the container (2), when a rotational movement is applied to the same, at least one pair of opposed teeth (9) collaborating with said groove (8) which are finished off with leastically deformable arms (10) of the casing(1).