Apparatus for lighting, heating, steam generating, cooking, refrigerating, drying, ventilating, water supply and sanitary purposes; prefabricated shower baths sold as a unit; boilers for water heater; bathroom heating and drying machines; floor heating apparatus; heat pumps (for hot water supply apparatus and heating apparatus); air heating apparatus; air cooling apparatus; water purifying device; electric beverage dispensers; solar water heaters; solar heat collecting device for hot water supply apparatus and heating apparatus; gas hot-water heating apparatus; gas water heaters; oil water heaters; heat exchangers for water heater; burners for water heater; exhaust pipe for water heater; casings for water heater; gas water heaters by latent heat recovery system; oil water heaters by latent heat recovery system; hot water supply apparatus combined with heat pumps and gas water heaters; hot water supply apparatus combined with heat pumps and oil water heaters; oil hot-water heating apparatus; hot water storage tank for hot water supply apparatus; devices for controlling the dispensation of gas for gas water heaters; devices for controlling the dispensation of gas for gas cooking stove; devices for controlling the dispensation of gas for gas stoves; valves for controlling the dispensation of gas for gas cooking stove; valves for controlling the dispensation of gas for gas water heaters; electric water heaters; clothes dryers; humidifiers; air cleaners; dehumidifiers; electromagnetic cooking stoves; air conditioners; range hoods for kitchen; dish dryers for kitchen; electric rice cookers; electric microwave ovens; kitchen ranges (ovens); electric pans; electric deep fryers; bread toasters; grills; gas cooking stoves; kerosene cooking stoves; sinks; wash-hand basins (lavatory); bath tubs; bubble baths; shower head; shower hose; water faucet; taps for tubs and showers; shower trays; flexible tubes for showers; bath boilers; toilet stool units with a washing water squirter; gas fan heaters; oil fan heaters; gas stoves