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Press Release
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Following a very rigorous evaluation of over 3,600 proposals, Calyos has been selected by NATO to join its prestigious DIANA (Defence Innovation Accelerator for the North Atlantic) programme under the Energy & Power challenge.
Data centres and compute platforms are essential infrastructure for both the civilian digital economy and modern defence operations. They demand high energy efficiency, robust reliability, and low dependency on local environmental resources such as water or stable power supply.
Our passive two-phase cooling technology has been selected by DIANA to help address this challenge by enhancing energy efficiency, sustainability and resilience in both fixed and deployable data-centre environments.
We have developed unique two-phase cooling solutions that allow component cooling using the latent heat of vaporisation. Operating without pumps and requiring no maintenance, it can reduce cooling energy consumption by up to 50% while providing silent, reliable performance under harsh conditions such as vibration, dust, and extreme temperatures - qualities essential for mission-critical defence applications.
Founded in 2012, Calyos is a Belgian technology company of 20 people that designs, develops and manufactures innovative thermal solutions deployed across mobility, defence, and high-performance computing. The company is recognised by leading automotive, aeronautic and computing customers for its strong engineering capabilities and culture of innovation. Calyos solutions can be fully produced in Belgium and Europe, supporting strategic sovereignty and secure supply chains for defence.
Six months of collaboration
With DIANA support, Calyos will upscale its passive cooling technology to cool servers and compute platforms used in ruggedized and tactical data centres, addressing the needs of both defence and civilian operators.
Calyos is backed by multiple investors and customers and continues to strengthen its position as a key European player in advanced thermal management, supported by new strategic partnerships currently under development.
Further reading:
Diana Nato 2026 Cohort of CompaniesWho We Are
Calyos is a leader in the design and manufacture of two-phase thermal management systems. Building on our heritage from Euro Heat Pipes (EHP) and their space technology expertise, we specialize in innovative cooling solutions that tackle the thermal challenges of tomorrow.
What We Do
We engineer advanced cooling technologies, including loop heat pipes, micro-channel heat pipes, and pulsating heat pipes, to optimize thermal performance across a variety of applications. Typically these include: power electronics, processors, and batteries, but we don't stop there we are continuing to develop and produce fully customizable solutions for other specific needs, for example e-motors and fuel cells.
Where We Operate
Calyos is headquartered in Charleroi, Belgium, where our engineering and production teams work side by side in a state-of-the-art facility. From this base, we serve a global clientele, providing our cutting-edge solutions across North America, Asia, Europe, and South America.
When We Started
Calyos was incorporated in 2014 as a spin-off from Euro Heat Pipes (EHP), which was established in 2001 and has become a major player in the European satellite market. Since then, Calyos has been adapting and evolving EHP's space-grade cooling technologies for terrestrial applications.
Why We Matter
Our mission is to lead the industry towards adopting the most effective and sustainable thermal management solutions. We aim to address the most pressing thermal challenges in the data-driven and electrified environments of today, leveraging passive cooling technologies to achieve superior efficiency and environmental stewardship.
How We Succeed
Our success is driven by our commitment to four core values:
1. Applied Knowledge - Transforming deep technical expertise into market-ready solutions.
2. Better Together - Emphasizing collaboration with all stakeholders to enhance our collective success.
3. Inherent Flexibility - Adapting our solutions and practices to keep pace with evolving market demands.
4. Continuous Research - Persistently innovating to maintain our leadership in thermal technology.
