ONI-Wärmetrafo: Your Energy Optimizer!
ONI customers reduce their carbon footprint by 5.5 million tons of CO2 annually. This is equivalent to the emissions of approximately 5 million VW Golfs driven 10,000 km per year.
For Business Leaders: Strategically Managing Energy and Cost Efficiency
Rising energy prices, increasing regulatory pressure, and limited investment leeway require clear business decisions today.
ONI supports executives of energy-intensive companies in leveraging energy efficiency as a strategic business lever—with concrete, verifiable savings potential, well-founded business cases, and solutions that can be strategically justified. This enables you to secure sustainable EBIT, liquidity, and competitiveness without getting bogged down in technical details.
For Plant Managers: Optimize Processes, Ensure Stable Operations
Rising energy costs, high production pressure, and limited personnel resources demand solutions that work reliably in day-to-day operations. ONI helps plant managers safely integrate energy efficiency measures into existing workflows—with measurable savings, stable processes, and solutions that don’t slow down ongoing operations. This way, you increase efficiency, supply reliability, and plant availability without adding complexity.
The ONI Success Story: From a Garage to a Global Market Leader
Founded in the early 1980s, ONI has been writing a success story for four decades now. From very humble beginnings, the company has grown into a business with more than 485 employees, earning worldwide recognition and awards not only for its energy-saving system solutions but also for its corporate performance. Today, more than 6,000 customers in over 70 countries worldwide—ranging from small and medium-sized businesses to global corporations—rely on energy-saving technology from ONI.
Heating
ONI implements heating concepts primarily through heat recovery, high-performance hydraulics with industrial pumps, and—depending on your needs—combined heat and power (CHP) units as an efficient solution for both electricity and heat. This results in a customized industrial hall heating system tailored to your specific industrial application and requirements.
All Solutions
Everything from a single source at a glance.
Heating
Cooling
Ventilation
Energy Supply & Storage
System Technology & Plant Optimization
Bernhard Gell | Project Manager | HILTI
“For over 20 years, ONI has been responsible for the installation and technical support of refrigeration systems at Hilti Kunststofftechnik GmbH. During this time, our experience working with them has been entirely positive, both in terms of their consulting services and the quality of their work and technical support.”
Bernhard Gell | Project Manager | HILTI
“For over 20 years, ONI has been responsible for the installation and technical support of refrigeration systems at Hilti Kunststofftechnik GmbH. During this time, our experience working with them has been entirely positive, both in terms of their consulting services and the quality of their work and technical support.”
Kunststoff- und Elektrotechnik GmbH
Kunststoff- und Elektrotechnik GmbH uses refrigeration systems from Oni-Wärmetrafo GmbH at its production site in Mönchweiler.
Responsibility for the Future
ONI operates based on a clear philosophy: taking responsibility for the future—together with our customers. At the core of this is the conviction that economy and ecology are not mutually exclusive. That is why ONI develops system solutions that require less and less energy, counteract rising energy costs, and simultaneously significantly reduce the environmental footprint.
Sustainability is not just a buzzword here, but a guiding principle for development, growth, and service: From the initial idea to implementation, energy-efficient systems and services are delivered from a single source—with the goal of ensuring a sound return on investment and minimizing environmental impact.
The impact is measurable: Collectively, ONI customers reduce the environmental burden by more than 5.5 million tons of CO₂ annually. Complemented by reliable, comprehensive service even after delivery, our vision and mission evolve into long-term partnerships—for more efficient processes and a more sustainable industry worldwide.
Join our team
"Our success is the result of outstanding teamwork and a product and service portfolio that is perfectly tailored to market needs. We are a strong team […]. That is why, for me, our employees are just as important as our customers!"
(Wolfgang Oehm, company founder and managing partner)
