A representative from Calyos will reach out to you to plan an introductory web call where they will explain how our technology works and demonstrate the applications and benefits of it.
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Calyos and Noctua showcase advanced development of Pump-Free Two-Phase Thermosiphon Cooling
The two-phase thermosiphon CPU cooler developed by Calyos and Noctua has made significant progress over the past year. The project is focused on delivering all-in-one liquid-cooling performance and convenience without a pump or other moving parts in the fluid circuit. Heat transfer is achieved through evaporation, condensation and gravity-driven fluid return, eliminating pump-related noise, vibration and wear.
Development and validation capacity has been considerably expanded. Up to four evaporator designs can now be produced per day, compared with approximately one per month previously. More than 400 evaporator prototypes and 25 condenser prototypes have been manufactured and tested during the last 12 months.
Transparent evaporator sections and high-speed imaging have enabled detailed observation of vaporisation and internal fluid circulation. These analyses have supported improvements to the evaporator geometry, enhancing vapour release, circulation and resistance to localised heat concentrations. A porous sintered-copper microlayer has also been introduced to improve surface wetting and vaporisation, while reducing the risk of vapour blanketing and local dry-out under high heat flux.
The condenser has been optimised for use with Noctua NF-A12x25 G2 fans. A revised U-flow configuration, featuring inlet and outlet connections on the same side, improves system integration. In addition, a new tube material provides lower permeation, reduced non-condensable gas formation, improved connector sealing and regulatory compliance.
The thermosiphon remains under development as performance, reliability and production requirements continue to be validated. A commercial release is currently targeted for the third quarter of 2027.
Further reading:
Noctua at Computex 2026 Thermosyphon Development ProjectWho 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.
