About GWK

Innovative, tailor-made, known throughout Europe

GWK products have been leading the market for valve insulation for over 30 years and are well-known throughout Europe. As a manufacturer long focused on the processing of polyurethane, GWK has steadily expanded its know-how in recent years to include the processing of other materials, which are selected according to the intended use and insulating properties in order to develop optimum insulation for each application.

Rakete Unternehmensgründung
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  • 1987

    The foundation

    Foundation of GWK by Günter Kuhlmann, introduction of the ES-Box (energy-saving box) for the heating/sanitary sector, also known as “Kuhlmann caps”.

  • 1995


    In future, sales will be carried out in cooperation with specialist retailers.

  • 2000

    Change of management

    Change of management to Fred Kuhlmann, expansion of the product range to include the DH system for district heating and plant construction, the PHE boxes as custom-fit insulation for plate heat exchangers

  • 2009


    Expansion of the company premises, addition of a further production hall

  • 2010

    Expansion of the product range

    Expansion of the product range to

    • the AL system (modular system) for district heating and industry
    • EPP boxes as cost-effective valve insulation

    Continuous expansion of the OEM segment (original equipment manufacturers)

  • 2011

    Range expansion

    Expansion of the material range to include semi-rigid integral foam

  • 2012

    New production line

    Introduction of the new XPE press production line for cold applications

  • 2013

    Addition to the management

    • Development and installation of a heat recovery system
    • David Meermeyer added to the management team
  • 2014


    • Expansion of the tool and mold making department with two new CNC machining centers
    • Expansion of production lines in the EPP and PU sector
  • 2016

    Introduction ES-Box Uni

    Introduction of the ES-Box Uni for stockholding specialist wholesalers

  • 2017

    Expansion and extension

    Expansion of the company premises, addition of a further production hall

  • 2020

    Plant II

    Planning of Plant II with production hall, logistics and administration (construction expected to start at the end of 2020)

  • 2021

    Start of construction of Plant II

  • 2022

    • Commissioning of Plant II
    • Expansion of the product range to include the ES-Box COOL as custom-fit cold insulation.

Member of the VDI committee

We have been involved in the Association of German Engineers (VDI) for several years. As a committee member, for example in the Guidelines Committee 4610, we contribute our expertise and know-how in the area of ​​“insulation of heat/cold bridges”. As practitioners in our industry and based on our own research and development work, we can do our part to make these guidelines practical. By participating in these committees, we can implement future guidelines in our products and those of our customers at an early stage.

Am Dienstag den 02.04.2024 wird die GWK Kuhlmann GmbH aufgrund einer Wartung der Telefonanlage nur eingeschränkt telefonisch erreichbar sein. Bitte kontaktieren Sie uns per E-Mail.