NACE 25.3 – Manufacture of Steam Generators | Public Tenders
NACE 25.3: Steam generators and heat exchangers in public procurement. CPV codes, contracting authorities and procurement procedures for energy-generation plants.
Definition: NACE 25.3 covers the manufacture of steam generators for industrial steam and electricity generation as well as of nuclear-reactor pressure vessels and heat exchangers for the process industry and the energy sector.
Legal basis: NACE Rev. 2 (Regulation (EC) No 1893/2006) · Last updated: January 2026
What does NACE 25.3 cover?
NACE 25.3 (Manufacture of steam generators) classifies manufacturers of high-pressure steam boilers, hot-water generators and heat exchangers for energy-generation and industrial plants — strategically important for public energy supply.
| Class | Title | Typical outputs |
|---|---|---|
| 25.30 | Manufacture of steam generators | Power-station steam boilers, heat-recovery boilers, heat exchangers, nuclear-reactor pressure vessels |
Typical application areas are combined heat-and-power plants (CHPs, CCGT plants), waste-incineration plants, biomass heating power plants and district-heating power stations — predominantly in public or municipal ownership.
Public tenders: steam generators and energy generation
Steam generators from NACE 25.3 are procured primarily by energy supply companies and municipal operators as part of new and converted power-plant projects — typically high-volume individual projects.
Typical contract types
- Waste-incineration plants: municipal waste-incineration plants procure steam generators for energy recovery from waste
- Biomass heating power plants: municipal energy utilities build biomass power plants with NACE 25.3 components
- Heat-recovery boilers for CHPs: CHPs in public properties use heat-recovery boilers for heat recovery
- District-heating centres: municipal district-heating networks require peak-load and reserve boilers
- Heat exchangers for wastewater-treatment plants: digester heating and biogas use in municipal wastewater-treatment plants
Relevant CPV codes
| CPV code | Title | Application area |
|---|---|---|
| 44611000 | Boilers | Steam and hot-water boilers in general |
| 44611200 | Steam boilers | High-pressure steam generators for power plants |
| 42164000 | Heat exchangers | Industrial heat exchangers and condensers |
| 09330000 | Solar and wind energy | Boilers for renewable-energy systems |
| 42514000 | Filter and cleaning equipment | Flue-gas cleaning for boiler houses |
Contracting authorities and bidders
Public contracting authorities
Municipal energy and district-heating companies, state power-station companies and public waste-management companies (WIP operators) are the main buyers. As utility contracting authorities in electricity and heat, they are subject to utilities procurement law, which allows more flexible procedures. Individual contracts often reach significant volumes in the double-digit millions.
Bidders and eligibility requirements
- Pressure Equipment Directive 2014/68/EU: CE marking and conformity assessment under PED for all pressure equipment above 0.5 bar
- TÜV and DEKRA acceptance: steam generators are subject to regular inspections under industrial-safety regulations
- EN 12952 / EN 12953: standards for water-tube and shell boilers
- Experience references: reference list of comparable steam-boiler plants with performance data
- EPC and turnkey experience: full projects including engineering are often procured
Frequently asked questions on NACE 25.3 and public tenders
Which procedure is customary for steam-generator procurement? Owing to the high technical complexity and considerable contract volume, the restricted procedure with prior call for competition or the negotiated procedure is frequently chosen. The competitive dialogue is used for particularly innovative plant concepts.
Are steam boilers in power plants subject to special safety regulations? Yes. In addition to the Pressure Equipment Directive, the German industrial-safety ordinance (BetrSichV), TRBS 2141 and state trade regulations apply. Steam boilers above certain pressure levels are installations requiring monitoring with mandatory regular inspection.
- NACE C – Manufacturing: parent section
- NACE 25 – Fabricated metal products: parent division
- NACE 25.2 – Radiators and central-heating boilers: related heating technology
- NACE 28.1 – General-purpose machinery: process-engineering machinery
Last updated: January 2026 All information provided without warranty. For legally binding advice, please consult a law firm specialising in public procurement.
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