a steam generator is disclosed for a cooking apparatus , having an intermediate duct admitting discharge water into the lowest central portion of the enclosure of the generator , and connected to a vane pump whose outlet feeds into an outlet duct rising as far as an upper bend then descending as far as an emptying duct . heating tubes cause vaporization of the water which they contain and the steam escapes through a horizontal upper duct then a steam conduction duct . the generator applies in particular to ovens for cooking food .