Apparatus for producing steam; apparatus for steam generating; apparatus for the cooking of foodstuffs using a steam-air mixture; apparatus for the heating of foodstuffs using a steam-air mixture; electric steamers for cooking; electric steaming apparatus for cooking; electrical installations for steam generation; installations for the development of steam; installations for the production of steam; installations steam generating; steam generating apparatus; steam generating installations; steam producing apparatus; steam producing installations; steam producing machines; steaming installations; steaming machines