Apparatus and installations for heating, ventilation and water supply; domestic and commercial heating systems and appliances; solar heating systems and appliances; boilers; water heaters; gas fires; gas boilers; control systems for boilers; combined heat and power boilers (CHP), central heating boilers, illumination effects for gas fires; flues; smoke and fire dampers; dampers for use in heating and ventilating apparatus and equipment; dampers for use in air ducted systems; actuator drive interfaces for dampers; apparatus for ventilation and air control; heat pumps, thermostatic valves; parts and fittings for all the aforesaid goods.;