Line of rack-mountable liquid cooling heat exchanger assemblies includes models designed to dissipate more than 10 kW of heat. The heat exchanger assemblies are enclosed within ruggedized aluminum chasses. In one application, the heat exchanger pairs copper-nickel cores with a Maxiax vaneaxial blower to dissipate heat from the electronics rack for a ship’s water supply. Assemblies can be customized for input voltages, heat transfer rates, chassis-mounting options and MIL-grade environmental requirements. The units also can be paired with tubeaxial fans and monitored using low-speed warning detectors.