Heating, steam generating, cooking, drying and water supply apparatus, solar collectors for hot water generation and being parts for thermal solar installations; storage tanks being parts for installations for hot water generation using renewable energy; parts and fittings for the aforesaid goods, included in this class; parabolic mirrors for mobile and stationary solar installations, in particular trough-shaped parabolic mirrors for solar energy-operated mobile hot beverage preparation devices and solar installations for power generation, cooling, seawater or brackish water treatment by means of distillation, and for generating process heat or process steam