UK SIC 2007 code in Section C: Manufacturing
25300 Manufacture of steam generators, except central heating hot water boilers
SIC 25300 is the UK code for manufacture of steam generators, except central heating hot water boilers. Companies House accepts it when you register a company or file a confirmation statement.
- Code
- 25300 (UK SIC 2007, Companies House list)
- Section
- Section C: Manufacturing
- Division
- 25 Manufacture of fabricated metal products, except machinery and equipment
- SIC 2026
- 25.21 Manufacture of central heating radiators, steam generators and boilers (1:1)
Activities ONS lists under 25300
The ONS index assigns these 45 activities to this code. If one describes your company, this is the code to use.
- Auxiliary plant for use with steam generators (manufacture)
- Boiler (nuclear powered) (manufacture)
- Boiler drum (manufacture)
- Boiler feed water heater (manufacture)
- Boiler for marine applications (manufacture)
- Boiler fuel economiser (manufacture)
- Boiler fuel handling plant (manufacture)
- Boiler house plant (manufacture)
- Boilers and associated equipment and parts (manufacture)
- Column (process plant) (manufacture)
- Condenser (steam) (manufacture)
- Condenser (vapour) (manufacture)
- Cracker for process plant (manufacture)
- Duct of heavy steel plate (manufacture)
- Economic boiler (manufacture)
- Economisers (manufacture)
- Evaporator (manufacture)
- Firing plant for boilers, etc. (manufacture)
- Heat exchanger for process plant (manufacture)
- Industrial air heater for boilers (manufacture)
- Marine or power boiler parts (manufacture)
- Nuclear fired boiler (manufacture)
- Nuclear fuel plant (manufacture)
- Nuclear reactor parts (manufacture)
- Nuclear reactors (manufacture)
- Penstock made of steel (manufacture)
- Pipe system construction for steam generators (manufacture)
- Process heater (manufacture)
- Process pipework (manufacture)
- Process pressure sphere (manufacture)
- Process pressure vessel (manufacture)
- Reactor column (manufacture)
- Reactor vessel (manufacture)
- Reformer (manufacture)
- Shell boiler (manufacture)
- Steam accumulator (manufacture)
- Steam boiler (manufacture)
- Steam collector (manufacture)
- Steam generator (manufacture)
- Steam generator parts (manufacture)
- Super-heaters (manufacture)
- Vapour generators (manufacture)
- Vertical boiler (manufacture)
- Waste heat boiler (manufacture)
- Water tube boilers (manufacture)
Source: ONS UK SIC 2007 alphabetical index.
What changes in SIC 2026
ONS published UK SIC 2026 in 2026. Its correspondence table maps this code's class (25.30) to:
| SIC 2026 code | Heading | Link type |
|---|---|---|
| 25.21 | Manufacture of central heating radiators, steam generators and boilers | 1:1 |
"1:1" means the class carries over unchanged in scope; other link types mean it was split or merged. Companies House still uses SIC 2007, so keep filing with 25300 until it announces a switch.
Data last changed November 14, 2026. Source: Companies House condensed SIC list. How this page is built.