Nexalus: The Data Center Liquid Cooling Heat Recovery System Built for What Air Can't Do
Every data center on Earth has the same problem. The harder it works, the
hotter it gets. Cooling that heat consumes roughly one third of a facility's
total energy — burned purely to manage a side effect. For decades, that wasted
heat went nowhere useful. Nexalus built a system that changes where it goes.
Founded in Cork, Ireland, Nexalus redesigned data center liquid
cooling heat recovery from the ground up. Its sealed-server approach runs
liquid directly across GPUs and CPUs, captures thermal energy at the source,
and redirects it to heat buildings, campuses, or city districts nearby. The
data center stops consuming energy just to cool itself. Instead, it starts
producing usable heat for the communities around it.
Kenneth O'Mahony, Co-Founder and CEO, described the mission simply:
convert energy users into energy borrowers. That shift, he said, was the entire
reason Nexalus existed.
How Data Center Liquid Cooling Heat Recovery Works at the Chip Level
Air cooling loses most of the heat it generates straight into the
atmosphere. Nexalus closes that loop entirely. Liquid flows to the chip
surface, absorbs heat at the point of generation, and exits the server at
temperatures high enough to be practically useful elsewhere. Consequently, the
system recovers between 80% and 95% of heat that conventional cooling simply
wastes.
The outcome numbers are specific. TIME, which named Nexalus to its 2025
Best Inventions list, reported that the system reduces energy use by 20% and
cuts server footprints by 33%. Servers pack more tightly when heat is removed
directly rather than blown away with fans. Furthermore, the system operates
with a Water Usage Effectiveness score of zero — meaning no water is used for
cooling at all, removing one of the most environmentally damaging elements of
traditional data center design.
One year of heat recovery from a single Nexalus Nano Edge Server
deployment carries enough thermal energy to power the equivalent of 137 million
homes. That figure reflects how much energy the data center industry currently
releases into the air and loses forever.
The Partnerships Scaling Data Center Liquid Cooling Globally
The technology moved into commercial deployments quickly. In December
2024, Nexalus integrated its data center liquid cooling system into
three of HPE's most widely used servers — the ProLiant DL360, DL365, and
DL380a. Dell Technologies followed, embedding Nexalus systems across servers,
workstations, and AI platforms. Intel joined for edge computing and 5G
deployments, using Nexalus's patented jet impingement technology in
weather-resistant enclosures built for extreme outdoor environments. Moreover,
Formula One racing adopted the technology for high-performance compute cooling
— a sector where thermal precision is measured in milliseconds.
Then, in February 2026, Nexalus appointed Alps Alpine as its official
global manufacturing and systems integration partner. The County Cork
production facility Alps Alpine manages was originally built as an ICT
manufacturing hub for Apple. It now applies automotive-grade quality standards
to Nexalus systems, giving the company the consistency and global reach to
scale beyond Ireland.
Fast Company named Nexalus to its 2025 World Changing Ideas list. TIME
followed with Best Inventions recognition. Both awards reflect the same
reality: data center liquid cooling heat recovery has moved from a
research concept into a product already deployed by some of the world's largest
technology companies.
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