Air valves for steam heating installations; Boilers for heating installations; Central heating radiators; Heaters for vehicles; Heating installations; Hot water heating installations; Humidifiers for central heating radiators; Oven gas igniters; Pipes for heating boilers; Radiators; Radiators, electric; Refrigerating machines; Refrigerating machines and installations; Thermostatic valves; Thermostatic valves as parts of heating installations; Water heaters; Hot water heaters