SIC code 25300 — Manufacture of steam generators, except central heating hot water boilers — is a specialist classification with 27 active companies in the UK. Despite its small size, this category represents an important part of the manufacturing sector. It falls under Section C (Manufacturing) of the UK SIC 2007 classification system, which is used by Companies House to categorise all registered businesses.
See the full industry analysis on the Manufacture of steam generators, except central heating hot water boilers industry page.
The average company age is 13.2 years, indicating an established sector with a mix of long-running businesses and newer entrants. Growth has been exceptional recently: 52% of all active companies were formed since 2020, marking this as one of the fastest-expanding classifications. The 2010s contributed another 19%, meaning the vast majority of businesses are relatively new. The highest concentration of manufacture of steam generators, except central heating hot water boilers companies is in LONDON, with 7 active firms (26% of the sector).
SIC code 25300 stands for "Manufacture of steam generators, except central heating hot water boilers" under the UK Standard Industrial Classification (SIC 2007) system. It belongs to Section C — Manufacturing. Companies use this code when registering with Companies House to indicate their primary business activity. The code is required for annual confirmation statements and is used by HMRC, ONS, and other government bodies for statistical and regulatory purposes.
There are currently 27 active companies registered under SIC code 25300 in the UK, out of 33 total registrations. This gives a survival rate of 82%, meaning 18% of companies registered under this code have since dissolved. These figures are based on Companies House data and updated regularly.
The top locations for manufacture of steam generators, except central heating hot water boilers companies (SIC 25300) are: LONDON (7). Geographic concentration can reflect local economic conditions, industry clusters, or proximity to key markets and supply chains.
The sector is growing: 52% of currently active SIC 25300 companies were formed since 2020, and 19% during the 2010s. This sustained formation rate indicates ongoing demand for manufacture of steam generators, except central heating hot water boilers services in the UK.
Companies classified under SIC 25300 have an average age of 13.2 years. This suggests a balanced sector with both established players and newer entrants. Notable companies include ROLLS-ROYCE PLC, ROLLS-ROYCE SUBMARINES LIMITED.
Related SIC codes within the same division include: 25990 (Manufacture of other fabricated metal products n.e.c.), 25110 (Manufacture of metal structures and parts of structures), 25620 (Machining), 25120 (Manufacture of doors and windows of metal). Companies may use multiple SIC codes if they operate across several of these related activities. When registering with Companies House, businesses should select the code that best represents their primary activity.
You can search for companies with SIC code 25300 (Manufacture of steam generators, except central heating hot water boilers) using UVAGATRON's company explorer, which allows filtering by SIC code, location, and company status. Alternatively, Companies House offers a basic search on their website. Our platform adds risk intelligence, director networks, and signals from 50+ government databases to each company record.
Search, filter, and analyse 27 companies classified under this SIC code with AI-powered risk intelligence.
Data sourced from Companies House, HM Land Registry, FCA Register, and 50+ government databases. SIC classification follows the UK Standard Industrial Classification of Economic Activities 2007 (SIC 2007). Last updated: 2026-04-17.