Air heaters; Air heating apparatus; Air heating apparatus for residential use; Central heating installations; Electric air heaters; Electric radiant heaters for household purposes; Electric space heaters; Freestanding electric patio heaters; Furnaces for central heating; Gas water heater for bathtub consisting of circulation pump with thermostat to fill, re-heat water and keep water warm; Hot water heaters; Humidifiers for household purposes; Installations for central heating; Residential air...