Saunas; Air valves for steam heating installations; Drain structures for use in spas, steam rooms and baths; Electric heaters for commercial use; Electric heaters for massage stones; Facial saunas; Footmuffs, electrically heated; Portable foot baths; Portable foot baths for use in showers, salons, spas; Sanitary installations in the nature of steam rooms; Sauna bath installations; Space heating apparatus; Steam accumulators; Steam generating installations; Steam generators; Steam valves