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The promise of quality

For over 160 years, WEHRLE has made a name for itself across the globe as an expert in the construction of water tube boilers. This reputation is based on our commitment to quality, which is the result of many years of experience, continuous improvement and a deep understanding of our customers' needs. Our numerous awards and specialist certificates ensure that we can meet the expectations of our customers and employees.

Quality is a continuous process that reflects our commitment to excellence in our work. It is the benchmark by which we measure ourselves and constantly strive to improve.

Customized plant engineering and complex large-part production in accordance with current quality guidelines and specific requirements



  • in accordance with the Pressure Equipment Directive and the AD2000, TRD regulations or customer-specific regulations
  • with the welding processes E (111), WIG (141), UP (121), MAG (135, 136) 
  • certified welders in accordance with DIN EN ISO 9606-1 and machine operators in accordance with DIN EN ISO 14732. The tests cover sheet metal and pipe processing
  • unalloyed structural steels in accordance with DIN EN 10025, such as S235JR and S355J2
  • Boiler construction steels such as: P235GH, P265GH, P295GH, P355GH, 16Mo3, 13CrMo4-5, 10CrMo9-10
  • fine-grained structural steels e.g. S690QL
  • heat-resistant steels according to DIN EN 10095
  • stainless steels

All certificates for download:

ISO 9001 - Quality management system


ISO 14001 - Environmental management system


NLF/ILO-OSH 2001 Occupational health and safety management system


Manufacturer of steel structures up to EXC4 according to DIN EN 1090


Approval as a WHG specialist company


Approval in accordance with AD2000 data sheet HP 0 / TRD 201 / EN 12952-5 and DIN EN 3834-2 for the manufacture of pressure equipment in accordance with the Pressure Equipment Directive 97/23/EC


We are a silver medal winner of the EcoVadis rating

Since 2021, WEHRLE has been listed as a silver medal winner by EcoVadis, the globally established provider of sustainability ratings for companies. We are proud to be listed among the top 5% of rated companies in our sector. In EcoVadis' overall rating, we are among the top 11% of all the companies listed on EcoVadis (as of 2023).

Systematic safety – we place great importance on occupational safety

WEHRLE has proudly carried the 'Systematic safety' seal of approval since 2010. Thanks to our consistent implementation of effective occupational health and safety management, we meet the requirements of the German Employers' Liability Insurance Association for Wood and Metal (BGHM) for systematic and effective occupational health and safety. At the same time, the standards of the National Guidelines for Occupational Safety and Health of the International Labor Organization (NLF/ILO-OSH 2001) are taken into account. In addition to checking documents, the main focus of the audit is on a tour of the company premises. The scope of the seal covers the Emmendingen site, national and international construction sites as well as the company's global plant operations and service activities.

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