253011 Steam or other vapour generating boilers/ super-heated water boilers

25301110 Watertube boilers (excluding central heating hot water boilers capable of producing low pressure steam) 25301150 Vapour generating boilers (including hybrid boilers) (excluding central heating hot water boilers capable of producing low pressure steam, watertube boilers) 25301170 Super-heated water boilers (excluding central heating hot water boilers capable of producing low pressure steam)