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Best quality deserves to be awarded!


Producing products of the highest quality was the foundation on which Walter Roller began developing heat exchangers in 1946. We have remained true to this philosophy until today and offer our customers a consistently high quality of our products. With Roller, you have a partner of the highest credibility and reliability at your side.

Type examination for heat recovery closed-loop recycling system:

EN 308

Roller heat exchangers have met the requirements of TÜV SÜD for heat recovery systems since 2009.

EN 308 specifies the test procedure for heat exchangers to determine the performance criteria of air/air heat recovery systems that recover heat from heating systems in buildings.

We will be pleased to provide you with the test reports on request.

Here you can download the certificate

Pressure testing of piping

Pressure test certification

Heat exchangers are one of the main components in refrigeration systems. They use tubes in which liquids and gases are transported under high pressure. Not only to ensure the safety of the equipment, but also that of people, testing for strength and leak tightness in accordance with the Pressure Equipment Directive is essential.

Every heat exchanger, whether as a stand-alone product or installed in an air cooler or air conditioning unit, undergoes a leak test in a water bath at Roller. This ensures the manufacturing quality and reliability of a product for our customers.

In addition, each heat exchanger is subject to a gas pressure test in accordance with its specified application limits. The test pressures being confirmed by the certificate provided here.

Here you can download the certificate

Excellent quality management system according to

ISO 9001

Walter Roller GmbH & Co has always been known as a quality producer of air coolers, air conditioners and heat exchangers - Made in Germany.  The requirements of our customers to receive high-quality products and reliable service is an important benchmark for us, which we ensure through standardised work processes.

The strict DIN EN ISO 9001 standard offers an excellent standard according to which we work and have been consistently certified since 1997.

With our long-standing certification according to this globally recognised quality management system, we prove to our national and international customers our high reliability in our daily work.

Here you can download the certificate

Maximum energy efficiency through the use of efficient fans

Ecodesign Directive (ErP Regulation)

In order to achieve the reduction of CO2 emissions by at least 20 percent stipulated in the Kyoto Protocol, the European Union has defined minimum requirements for energy-relevant products with the introduction of the ErP Directive 2009/125/EC (Energy-related Products Directive), also known as the Ecodesign Directive. The aim of the ErP Directive is to reduce energy consumption and CO2 emissions.

All our products are designed for maximum efficiency and since 2011 our air coolers for commercial refrigeration have been equipped with energy-efficient EC fans as standard.

In addition, we rely on brand manufacturers such as ebm-papst and Ziehl-Abegg for our fans, who in turn ensure compliance with the latest eco-design standards.

Quality assurance supported by our own laboratory

Effective quality assurance is not only the result of final production controls, process compliance and the availability of certificates, it is much broader than that.

To ensure compliance with all relevant safety and quality requirements, we have been using our own laboratory for many years. Here, the products are put through their paces by means of performance and functional tests under real application conditions. In this way, we can permanently guarantee the best possible quality products for your various applications.

We stand for 100%

Quality - Made in Germany


Cooling is always about reliable operation. That's why, for 75 years, our customers have appreciated not only the exceptional quality of our products but also:

  • Use of the highest quality materials from primarily German brand manufacturers
  • Robust products with maximum energy efficiency and durability
  • Fast processing times for shortest delivery times
  • Quality manufacturer with unusual flexibility