wood stoves; heaters; convector heaters; air heating furnaces; heating boilers; central heating boilers; central heating radiators; electric central heating boiler systems; industrial heating furnaces; furnaces for central heating; air heaters; electric radiant heating apparatus; electric heating filaments; heat exchangers for central heating purposes; radiators (heating); hot air heating apparatus; heating machines; warm air heating apparatus; extractors (ventilation or air conditioning); electric heaters; heating apparatus, electric; solar heating apparatus; electric heating apparatus; radiator heaters; domestic heating appliances; radiators for central heating systems; electric heating elements; solar heating panels; electric immersion heaters for room heaters; heating apparatus incorporating flues; thermostatic control valves for central heating radiators; electric immersion heaters for radiators; thermal controls (valves) for central heating radiators; flues for heating boilers; heating apparatus for furnaces; combined heating and air conditioning apparatus; floor heating apparatus; domestic central heating appliances; temperature controllers (valves) for central heating radiators; heating elements; electric boilers; coils for heating; air handling apparatus; air reheaters; room heaters; room air conditioners; convectors (radiators); fan heaters; induction units (heaters); electric radiators; space heaters; automatic temperature regulators (valves) for central heating radiators; electrically heated radiators; propellers (fans) for airconditioning apparatus; flues; chimney flues; flues incorporating extractors; telescopic combination flues; fittings for flues; flues for ventilating apparatus; flues incorporating fans; flues for heating apparatus; chimney blowers; combustion furnaces; chimney extractors; flues incorporating fans and/or extractors; heat exchangers for the removal of flue gases; chimney fans; fire ventilators for exhausting fumes; fire ventilators for exhausting vapours; vapour extraction hoods for fireplaces; evacuated heat pipe solar collectors (heat exchangers); dampers for furnaces; ventilators for heat exchangers; vapour extraction hoods for stoves; fire ventilators for exhausting gases; catalytic combustion heating apparatus; dampers (heating); chambered lid furnace; propane vapour-fired vertically disposed cylindrical convection space heaters; accumulation boilers; burners for boilers; fire ventilators for exhausting smoke; metering furnaces; furnace ash boxes; apparatus for exhausting mists (ventilation); passage furnaces; apparatus for exhausting particles (ventilation); radiator valves (thermostatic); heat regenerators; reheating furnaces; ventilating hoods; domestic boilers; smelting furnaces; charcoal stoves; combustors; fireplaces (domestic); fireplace inserts; kitchen stoves; pot furnaces