Firetube boilers (excl. central heating hot water boilers capable also of producing low pressure steam)

Vapour generating boilers, incl. hybrid boilers (excl. watertube boilers, firetube boilers and central heating hot water boilers capable also of producing low pressure steam)

Superheated water boilers

Parts of vapour generating boilers and superheated water boilers, n.e.s.

Central heating boilers, non-electric, of cast iron (excl. vapour generating boilers and superheated water boilers of heading 8402)

Central heating boilers, non-electric (excl. of cast iron, and vapour generating boilers and superheated water boilers of heading 8402)

Parts of central heating boilers of cast iron, n.e.s.

Parts of central heating boilers, n.e.s.

Auxiliary plant for use with boilers of heading 8402 or 8403, e.g. economizers, superheaters, soot removers and gas recoverers;

Condensers for steam or other vapour power units

Parts of auxiliary plant of heading 8402 or 8403 and condensers for steam or other vapour power units, n.e.s.

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 (excl. coke ovens, electrolytic process gas generators and carbide lamps)

Parts of producer gas or water gas generators and acetylene gas generators or similar water process gas generators, n.e.s.

Steam and other vapour turbines for marine propulsion

Steam and other vapour turbines, of an output > 40 MW (excl. those for marine propulsion)