iXora HRM-4 | Rack-Mountable Liquid Immersion Cooling for Existing Data Centers

The iXora HRM-4 is a single-phase, rack-mountable liquid immersion cooling system developed by iXora bv in the Netherlands. Designed to fit standard 19-inch racks, it enables data center operators to replace traditional air cooling without major infrastructure modifications — allowing phased, low-risk adoption.

How It Works Each server is placed inside an individually sealed cassette filled with dielectric cooling fluid, allowing direct liquid contact with all components for highly efficient heat removal. Unlike open-bath immersion tanks, the cassette-based design allows individual maintenance without affecting neighboring servers.

Key Differentiators

First, seamless integration with existing infrastructure. The HRM-4 mounts directly into standard 42U racks, eliminating the need for additional cooling infrastructure such as CDUs (Coolant Distribution Units) or large-scale pumping systems. This dramatically lowers the barrier to adoption.

Second, significant energy savings. According to an independent TCO study conducted by Deerns, a globally recognized MEP engineering consultancy, the iXora HRM-4 reduces cooling-related energy consumption by 50–60% compared to traditional air cooling. Key data center performance metrics — including PUE (Power Usage Effectiveness), WUE (Water Usage Effectiveness), and CUE (Carbon Usage Effectiveness) — show measurable improvement. The elimination of server fans also reduces IT equipment power draw.

Third, superior space efficiency. By removing the need for CRAH (Computer Room Air Handler) units and associated ductwork, more servers can be deployed within the same footprint. The Deerns report indicates that building area and land costs can be reduced by more than half.

Fourth, waste heat recovery. Hot water generated during the cooling process can be redirected into existing heat grids, aligning with the EU Energy Efficiency Directive (EED) and modern sustainability goals.

System Components The HRM-4 system includes a chassis, four individual cassettes, the iXora Integrated Management Module, a touchscreen monitor, radiator, circulation pump, and PDU. It is available as a stand-alone unit or as a flight-case-integrated unit for portable deployment and demonstration.

Target Applications The system is suitable for enterprise data centers, cloud service providers, AI/HPC computing environments, and colocation facilities. It is particularly well-suited for operators looking to upgrade or expand cooling capacity in existing facilities without costly renovations.

Patents and Certification iXora's immersion cooling technology is registered as a published patent in Korea (10-2023-0131890) and is designed and manufactured at iXora's headquarters in the Netherlands.