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We help engineers design high-performance, passive two-phase cooling systems.

Trusted by leading, global companies across different markets

Engineered Solutions Across Industries

Thermal management is a critical requirement across many different market sectors.

E-Mobility

Electrification is transforming the industry. Regulating the temperature of electrical components and systems with high-performance thermal management solutions is critical in extending the lifetime of a vehicle. Calyos provides solutions for all of these applications:

Data Centers & Computing

AI continues to drive up the power consumption of processors, from data center servers to edge devices, embedded systems and personal computers. Regulating the temperature of components and systems with high-performance thermal management solutions is critical to ensure they stay within safe operating temperatures. Calyos provides solutions for all of these applications:

Renewable Energy

As renewable generation grows, so does the need to store and convert energy efficiently. Regulating the temperature of BESS, power converters and inverters with high-performance thermal management solutions is critical in extending their lifetime. Calyos provides solutions for all of these applications:

Aero & Defense

From aircraft to armored vehicles, aerospace and defense platforms rely on increasingly powerful electronics operating in harsh, space-constrained environments. Regulating the temperature of components and systems with high-performance thermal management solutions is critical to ensuring mission reliability. Calyos provides solutions for all of these applications:

Our Latest News

Calyos Qualified for Phase 2 of ESA SPARK Funding Project

August 20, 2026

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Calyos and Jema selected for Wallonia - EU Project to develop an efficient cooling system for high power AC-DC converter

September 2, 2024

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The AI genAIRation | Part 1: Taking Air-Cooled AI Servers to the Next Level

August 10, 2026

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Discover The AI genAIRation | Calyos' tech series on Passive Two-Phase Direct-to-Chip-to-Air In-server cooling

July 17, 2026

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3 steps to implement passive two-phase cooling in your modern electronics

June 19, 2026

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Why do engineers choose Calyos?

Engineers across different industries are solving similar challenges using passive, two-phase cooling technologies.

Cost & Complexity

Self-regulating systems that require no controls, operating only when heat is applied.

Thermal Performance

Vaporization inherently has an extremely high heat transfer co-efficient.

Weight & Volume

Remove the need for pumps, connectors, valves and controls to save valuable space.

Energy Consumption

Two-phase is inherently passive, harnessing the latent heat of vaporization.

Safety

Dielectric fluid and self-regulation removes the risk of short-circuits and failure.

Two-Phase Technologies

Our team consists of experts in all things two-phase, who design and produce cooling systems using the following technologies.

Micro Channel Heat Pipes

MCHPs are a hybrid HP-PHP solution that remains a simple and lightweight ultra-efficient cooling solution.

Learn MoreMicro Channel Heat Pipes

Pulsating Heat Pipes

Also referred to as Oscillating Heat Pipes, Calyos is maturing this promising technology for a variety of applications.

Learn MorePulsating Heat Pipes

Heat Pipes

Traditional HPs are beautifully simple and provide incredibly low thermal resistances.

Learn MoreHeat Pipes

Loop Heat Pipes

LHPs provide the ability to not only handle very high heat flux, but also to transport heat over long distances.

Learn MoreLoop Heat Pipes

Calyos makes applying these two-phase technologies feasible.

By working side by side with our clients, Calyos can pair our knowledge and experience with our clients understanding of their application. This allows us to continue to develop innovative cooling systems that are viable in terms of mechanical design, cost and thermal performance for real-world applications.

Two-Phase Physics

Our experts enable us to produce
proprietary wick structures that maximize capillary pumping. We meticulously select fluids and fine-tune vaporization and condensation processes to deliver exceptional performance that Calyos is globally recognized for.

Modelling & Simulation

Calyos' advanced modelling capabilities integrate physics-based simulations with complex models derived from empirical test data. Two-phase modelling is not easy and this crucially ensures accuracy balancing theoretical precision and real-world validation.

System Design

Calyos' patents and exclusive know-how enable robust designs, that easily mechanically integrate with your application while remaining cost effective to manufacture, assemble, fill with fluid and install.

Manufacturing

In combination with our own facility and testing laboratory, Calyos has relationships with industrial partners in different regions and for different markets to meet the mass production needs for our clients.

Common Applications

Regardless of the market, the same applications have ever-increasing cooling requirements.

Embedded Electronics

Electronics are now embedded in almost every application, from vehicles and aircraft to industrial equipment and telecom infrastructure. As components shrink and power density rises, they produce more heat in tighter spaces where traditional cooling struggles.

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Embedded Electronics

Batteries

Advancements in battery chemistry combined with demanding user needs such as fast charging are resulting in battery packs becoming increasingly difficult to thermally manage.

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Batteries

Power Electronics

Advancements in nano-technology (including GaN & SiC) are creating components with ever increasing heat density, combine this with the need to reduce packaging weight and volume and power electronics are increasingly difficult to thermally manage.

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Power Electronics

Servers

Advancements in nanometer lithography combined with demanding workloads from AI are resulting in computer processors that are producing more waste heat at an increased density.

Learn More
Servers

Let's Get Started

Schedule an introductory call with one of Calyos' two-phase experts.

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