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Solutions
Heating Cooling Ventilation Energy Supply & Storage Systems Engineering & Plant Optimization

Heat Recovery Industrial heat pumps Combined heat and power plant Refrigeration systems Rent a refrigeration unit Container Refrigeration Systems Mobile refrigeration unit Ventilation Systems Cleanroom Technology Ice storage Battery storage Compressed air systems Cooling water Cooling Water Treatment Temperature control technology Energy-Efficient Machine Optimization

Heat Recovery

Our heat recovery systems are used worldwide by customers across a wide range of industries. This not only helps customers reduce their energy costs but also makes a significant contribution to reducing their environmental impact. Find out more—free of charge and with no obligation—about the possibilities for utilizing waste heat in your business!

Industrial heat pumps

Industrial heat pumps offer businesses an efficient solution for heating and process heat—especially when waste heat is used as a heat source and the goal is to reduce energy costs.

Combined heat and power plant

As a system supplier, ONI-Wärmetrafo GmbH offers you a wide range of services from a single source. This includes the integration of an existing CHP plant or the design of a new one. We have already completed numerous projects involving combined heat and power plants and would be happy to present you with a system solution tailored to your needs and based on our experience.

Energy-efficient cooling systems tailored to your needs

Let our experts advise you and schedule a no-obligation consultation today. We look forward to designing a system for you.

Rental refrigeration systems / Rental chillers

Do you need additional capacity on short notice, or are you planning a renovation that requires a flexible cooling solution? Then get in touch with us!

Container Refrigeration Systems

Demand for modular energy centers has risen rapidly in recent years. The reasons for this trend can certainly be found in the quick availability, flexibility, and space-saving design of these high-performance ONI systems. From cooling and chilled water to heating and compressed air supply—including pumps, tanks, and control units—the entire system is arranged in a compact, space-saving manner within modular units.

Refrigeration Equipment & Technology

A reliable and energy-efficient supply of cooling water for production is a top priority for any business. That is why more and more companies around the world are choosing our energy-optimized and highly reliable cooling system technology

Highly efficient ventilation systems and room air conditioning systems

Our ventilation systems and room air conditioning systems feature state-of-the-art technology and meet the highest standards for efficiency and reliability.

Cleanroom Technology

The need for a cleanroom environment, where exposure to airborne solid or liquid particles is minimized, usually stems from product-specific or hygiene requirements. The range of industry-specific requirements is broad, and the associated system engineering is correspondingly complex.

Ice storage

Almost every industrial facility generates waste heat. Use our heat recovery systems to harness this energy for heating your offices, factory floors, and much more.

Battery storage in a container

A container-based battery storage system is a scalable storage solution that ensures flexible access to electrical energy during operations.

Compressed air systems

A reliable and efficient compressed air supply is a top priority for industrial companies. In this context, “reliable” also means generating and supplying compressed air in the quality and quantity required for production processes, machinery, and equipment.

Cooling water for industrial facilities

Cooling water in industrial systems: hydraulics, standards, operational and process safety, and energy efficiency in the recirculation cooling loop with ONI-PowerSave.

Cooling Water Treatment for Industrial Facilities

Cooling water treatment for reliable cooling systems: Stabilize water quality; reduce corrosion and scale buildup.

Temperature Control Technology with Rhytemper®

Optimal manufacturing process. The unit costs of die-cast and injection-molded parts are largely determined by mold temperature control! This is because mold temperature control has a direct impact on process stability, product quality, and cycle time.

EtaControl®: Energy Efficiency in Manufacturing

EtaControl® from ONI helps plastics processors quickly reduce energy costs.
Industries

Automotive Chemistry Energy Plastic Food Metal Pharmaceuticals Data centers
Service & Maintenance

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A glowing hot steel strand is water-cooled on a conveyor line with numerous nozzles.

Efficiently supplying the metal industry – ensuring stable operations

Metal: Cooling, Temperature Control & Waste Heat Recovery for Machining, Heat Treatment & Surface Finishing

In metalworking, cooling and temperature control systems influence tool life, surface quality, dimensional accuracy, and energy consumption—from machining and hardening/washing to anodizing and electroplating lines.

ONI helps metalworking companies view energy and utility systems as an integrated whole and make targeted improvements. From initial analysis through design to implementation, we create an infrastructure that operates reliably, remains scalable, and is easy to manage in daily operations. ONI integrates cooling, temperature control, heat recovery, and water quality into robust systems designed for 24/7 operation.

Overview of the Site

Benefits for customers in the metal industry
Project Process
Challenges in the metal industry
ONI Solution Overview for the Metal Industry
Contact
Why Choose ONI
Automotive References

Benefits for customers in the metal industry

Reduce costs, increase availability—without compromising the process

Two employees in hard hats discuss data on a tablet in front of an automated production line with a robot arm.

With ONI, you identify key levers, and we develop a concept that uses measurably less energy—while also operating more reliably. It’s not just about efficiency metrics, but about process stability: consistent media and temperature levels, reliable operating conditions, and a supply system that adapts even to changing production schedules

Quality & Output in Critical Processes
Energy savings via heat recovery/optimized cooling
Service/Rental Cooling: Safeguarding against retrofits, peaks, or outages
Anodizing/surface treatment processes – energy efficiency in the market: Practical examples demonstrate significant savings and quality gains in surface treatment
Recuperative heat recovery from process cooling: Multiple use of energy for process and building heating

Why You Should Choose ONI

Everything under one roof

How potential becomes a functioning business

At ONI, you get everything from a single source: from the initial consultation through analysis and planning to installation and commissioning—including tailored services for implementation, as well as service and maintenance.

Process
Assessment Recording of relevant media, temperature levels, and load profiles for a transparent evaluation of the current status.
Option Evaluation
Technical comparison of concepts such as free cooling, heat recovery, and optimized temperature control.
ROI, CAPEX/OPEX Comparison
Economic evaluation of the variants as a basis for decision-making regarding investment and implementation.
Assessment of Funding Opportunities
We assist companies in clearly categorizing eligible measures related to energy and resource efficiency and developing them into a project ready for application.

A mechanical room with branching copper piping, shut-off valves and flow controllers of an adiabatic supply system.

Challenges

Typical challenges in the metal industry

High energy consumption and rising costs

Metalworking processes such as machining, heat treatment, and surface treatment are energy-intensive. Rising energy prices are increasing the pressure to design cooling and temperature control systems more efficiently and to utilize waste heat.

Process stability and reproducible quality

Fluctuating temperatures, inadequate cooling, or inconsistent media quality directly affect dimensional accuracy, surface quality, and tool life. Precise and reliable thermal process control is therefore crucial.

High availability requirements in 24/7 operation

Production interruptions caused by failures in refrigeration or temperature control systems result in high costs. Robust, low-maintenance systems are required, along with service and redundancy concepts to ensure continuous operation.

Solutions