Air humidifying apparatus; Apparatus for filtering drinking water; Aquarium heaters; Automatic faucets; Automatic temperature regulators for central heating radiators; Bathroom heaters; Boilers for heating installations; Circulators in the nature of water heaters; Electric bath-water purifying apparatus for household purposes; Gas fired water heaters; Gas water heater for bathtub consisting of circulation pump with thermostat to fill, re-heat water and keep water warm; Hot water heaters