Abstract: A steam generator includes an orifice for feeding water to a porous material, a heater element passing through said porous material, and an outlet orifice for the steam created by heating said water, wherein the porous material and its heater element are contained in a case disposed in a removable sealed cassette that is connected in operation to a fixed portion of the generator containing water feed means, means for controlling the heater elements, and means for taking off the steam. The sealed cassette is connected to the fixed portion of the generator by means of snap-fastenings in order to enable rapid connection and deconnection, and it includes a water admission orifice connected to an internal case containing a heater element for the water and around which a porous material is compressed, said case including orifices over its entire surface for evacuating the steam produced by the heater element, with the steam being extracted from the cassette via a steam outlet orifice.