| 840219 | Steam or other vapour generating boilers (other than central heating hot water boilers capable also of producing low pressure steam); super-heated water boilers.-Other vapour generating boilers, including hybrid boilers |
| 840220 | Steam or other vapour generating boilers (other than central heating hot water boilers capable also of producing low pressure steam); super-heated water boilers.-Super-heated water boilers |
| 840290 | Steam or other vapour generating boilers (other than central heating hot water boilers capable also of producing low pressure steam); super-heated water boilers.-Parts |
| 840310 | Central heating boilers other than those of heading 84.02.-Boilers |
| 840390 | Central heating boilers other than those of heading 84.02.-Parts |
| 840410 | Auxiliary plant for use with boilers of heading 84.02 or 84.03 (for example, economisers, super-heaters, soot removers, gas recoverers); condensers for steam or other vapour power units.-Auxiliary plant for use with boilers of heading 84.02 or 84.03 |
| 840420 | Auxiliary plant for use with boilers of heading 84.02 or 84.03 (for example, economisers, super-heaters, soot removers, gas recoverers); condensers for steam or other vapour power units.-Condensers for steam or other vapour power units |
| 840490 | Auxiliary plant for use with boilers of heading 84.02 or 84.03 (for example, economisers, super-heaters, soot removers, gas recoverers); condensers for steam or other vapour power units.-Parts |
| 840510 | Producer gas or water gas generators, with or without their purifiers; acetylene gas generators and similar water process gas generators, with or without their purifiers.-Producer gas or water gas generators, with or without their purifiers; acetylene gas generators and similar water process gas generators, with or without their purifiers |
| 840590 | Producer gas or water gas generators, with or without their purifiers; acetylene gas generators and similar water process gas generators, with or without their purifiers.-Parts |
| 840610 | Steam turbines and other vapour turbines.-Turbines for marine propulsion |
| 840681 | Steam turbines and other vapour turbines.-Of an output exceeding 40 MW |
| 840682 | Steam turbines and other vapour turbines.-Of an output not exceeding 40 MW |
| 840690 | Steam turbines and other vapour turbines.-Parts |
| 840710 | Spark-ignition reciprocating or rotary internal combustion piston engines. -Aircraft engines |
