Abstract: An arrangement, for continuously steam treating pieces of fabric for dye development and fixing or for other steam treatments selectively requiring processing the fabric with saturated or with differently overheated steam, includes an open bottomed chamber having double-walled side and roof walls defining interior spaces. The lower region of the spaces is supplied with and contains a quantity of demineralized water. Heat exchange coils which are operative by circulating diathermic oil therein are immersed in the water for boiling the same and generating saturated steam. Selectively heatable additional coils are arranged in other regions of the spaces for selectively overheating the steam. Openings are provided at the top of the chamber for downwardly issuing saturated or overheated steam thereinto and means are provided for recycling the steam at an elevation above the plane defined by the open bottom of the chamber. Means are provided for continuously progressing fabrics through the steam filled environment.