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Purem by Eberspaecher is expanding its portfolio of components for fuel-cell systems, including solutions for water management, cathode isolation, hydrogen recirculation and air compression. The technologies target higher efficiency, reliability and hydrogen utilization in mobile and stationary fuel-cell applications.
Purem by Eberspaecher will present its latest hydrogen and fuel-cell technologies at the Hydrogen Technology World Expo in Hamburg from 20 to 22 October 2026.
For the bus and coach sector, the most relevant developments are the company’s Balance of Plant components for fuel-cell systems. These support functions around the fuel-cell stack, including air supply, water management, hydrogen recirculation and system isolation.
One of the latest additions is the De-Hydrator, designed to reduce moisture in the exhaust air of fuel-cell systems.
Managing water is an important part of fuel-cell operation. Excess moisture in the exhaust stream can contribute to visible steam formation and affect system behavior under certain operating conditions.
The De-Hydrator works alongside Purem by Eberspaecher’s Water Separator, which removes water from the cathode path, and its Silencer, developed for fuel-cell intake and exhaust systems.
Together, these components form a modular exhaust-air system intended to support water management, acoustic performance and operational reliability.
The company is also presenting its Cathode Isolation Valve, developed to seal the cathode path when required.
By limiting unwanted air exchange and leakage, the valve is designed to help protect the fuel-cell stack during shutdown phases and reduce conditions that can contribute to premature degradation.
For commercial vehicles such as hydrogen buses, component durability and repeatable system behavior are important because vehicles may operate for long periods and undergo frequent start-stop cycles.
Purem by Eberspaecher has also developed a Hydrogen Recirculation Blower.
Fuel cells do not convert all supplied hydrogen during a single pass through the stack. The recirculation blower returns unused hydrogen to the supply path, allowing more of the available fuel to be used rather than discharged.
Improved recirculation can therefore contribute to higher hydrogen utilization and more efficient operation of the fuel-cell system.
Through Eberspaecher Vairex, the group is also showcasing regenerative air compressors for fuel-cell applications.
These oil-free side-channel compressors are designed to supply the airflow required by the cathode side of the fuel-cell system. According to the company, the compressors combine optimized pressure ratios with low-vibration operation and high efficiency.
Air-management components are critical to fuel-cell performance because the stack requires a controlled supply of oxygen across varying load conditions.
Purem by Eberspaecher is also expanding its activities across the wider hydrogen value chain.
The company is working on industrialization projects for hydrogen generation, with a particular focus on high-temperature electrolysis, as well as metallic components and pressure vessels for hydrogen transport and storage.
In parallel, the company is developing a Direct Air Capture system that removes carbon dioxide directly from ambient air using solid sorption materials.
The captured CO2 can subsequently be stored or reused as an industrial raw material. While this technology is not directly related to bus vehicle systems, it forms part of the company’s broader decarbonization portfolio.
For the bus and coach sector, however, the most immediate relevance lies in the growing range of supporting components for fuel-cell powertrains, particularly as manufacturers continue to develop hydrogen-powered vehicles for longer-range and intensive-duty applications.
