Apparatus for lighting, heating, steam generating, cooking, refrigerating, drying, ventilating, namely, lights, heaters for baker's ovens, steam generators for use in the food industry, stoves, ovens, refrigerators, dryers for drying food, ventilators for kitchens and the food industry, heating elements for making ovens hot, machines for cooling pastries and other foods; bakers ovens; heating apparatus for ovens namely heating elements for making ovens hot; heat exchangers; air conditioning units; fermentation machines; cooling installations namely, refrigerators; freezing installation namely, freezers; pumps namely, pumps for pumping heated liquid; valves, namely steam valves and air conditioning valves