6 Ducts of metal for central heating installations and ventilating and air conditioning installations ;metal valves;screws and nuts of metal;pipes of metal, pipe connections of metal, cable linkages of metal (non electric), wall hooks of metal for pipes, soldered and screwed connectors, pipe sleeves of metal, elbows of metal for pipes, valves of metal, plugs of metal, traps of metal, water valves and pipes of metal, drain traps (valves) of metal, rods of metal for soldering, steel wool pads.
7 Machines and their constituent parts namely gas condensers;pumps [machines] and their constituent parts;valves, boiler headers;pressure reducers, machine valves;engines and motors (except for land vehicles)
9 Collectors, electric;thermocouples;thermostats, clock thermostats, thermostat probes, piezo lighters, thermostatic valves, heat regulating apparatus, electric resistors;electric, hydraulic, mechanical or electronic apparatus for the control and monitoring of heat, temperature, pressure, humidity, time and fluid levels;alarm and security devices for plumbing, sanitary, gas and heating installations, gas detection and analysis apparatus, electric, electronic and magnetic apparatus used to prevent limescale.
11 apparatus equipment for heating, air-conditioning, steam generating, cooking, refrigerating, drying, ventilating, water supply and sanitary purposes;all goods and components for water heaters, wall-mounted or floor standing gas boilers, gas radiators;taps, valves for pipelines, mixer taps for water pipes, flushing apparatus, lavatory cisterns, valves, valves and mechanisms for flushing apparatus, steam traps, air valves for heating installations, filters, water purification and water softening installations, filtering apparatus, water intake apparatus, hydrants;gas and steam condensers.
37 Building construction and repair services;installation and maintenance of water and gas distribution, heating and ventilation apparatus.