These suppliers are not selling the same thing. They differ in how the tank is built, which fluid they have committed to, which servers they support, how the heat leaves the building, and where in the world they can service what they sell. The largest difference is scope: some sell equipment and leave the rest to you, while others will design and run the whole facility.
Scaled specialist platforms
Submer and GRC both have products you can buy today and sites you can ask about. LiquidStack still sells immersion as well, though its distribution business for cold-plate cooling has grown faster.
Focused and regional specialists
Asperitas in the Netherlands, DCX in Poland, and Midas in Texas are smaller alternatives, each with its own approach to the tank and to how much of the installation it handles.
What to verify
Ask for the list of approved servers, the fluid warranty, evidence that the materials have been tested for years rather than months, the written service procedure, contacts at existing sites, and measured energy at the building boundary. How much heat the tank can take is the easiest question, and the least useful on its own.
Method and inclusion criteria
A company enters this landscape when it offers a data center immersion system or a material part of one, identifies a current product or service publicly, and provides enough evidence to distinguish equipment from a concept. The focus is on tank and system suppliers that a buyer could approach for a project. Fluid-only companies belong in the separate fluid landscape. A company is not excluded for being regional or private, but a logo, research prototype, or general cooling claim without an identifiable offer is not enough.
- Current immersion tank, module, or integrated service
- Public technical or deployment source
- Clear single-phase or two-phase architecture
- A route for a commercial buyer to engage
No universal rank
Ordering reflects research usefulness, not a league table. Named operating deployments, complete specifications, hardware and fluid clarity, and service coverage improve the evidence. They do not prove that one supplier has better reliability or cost across every site. A global platform may suit a campus rollout. A focused regional integrator may be better for a local pilot with close engineering support.
Separate tank scope from system scope
Some suppliers sell tanks and controls. Others include fluid, server preparation, heat exchangers, pumps, facility design, commissioning, and ongoing operation. Compare bids on a scope diagram from server to outdoor rejection. Mark who owns fluid compatibility, hardware warranty, lifting, filtration, controls, and heat-transfer performance. A lower tank price can leave most project risk with the buyer.
Qualify hardware and fluid together
The approved combination is the server, its materials, the fluid, and the tank. Ask for the exact server list and written warranty. Review drives, optics, batteries, labels, cable jackets, seals, and plastics, not only processors. Request aging evidence, fluid sampling rules, annual loss, fire classification, worker guidance, and end-of-life recovery. A fluid change later can require repeating the qualification work.
Inspect the operating workflow
A reference visit should show more than servers under fluid. Ask technicians to demonstrate isolation, lifting, draining, wet staging, component replacement, return to service, spill handling, sampling, and filter maintenance. Measure the time and required staff. Check whether normal tools, aisle widths, and safety procedures work with the heaviest approved chassis. These steps decide availability and labor cost.
Normalize performance evidence
Require heat capacity at stated fluid and facility-water temperatures, pump and fan power, redundancy, and full-load duration. Measure energy and water at a common boundary. Supplier power usage effectiveness claims often exclude different loads and cannot be compared directly. A production reference operating through seasonal conditions is stronger than a brief demonstration. An independent witness and raw trend data strengthen either.
Commercial and lifecycle diligence
Model tank, fluid, heat rejection, floor work, lifting, server preparation, spares, maintenance, and future refreshes. Verify where equipment and fluid are made, quoted lead time, local inventory, technician coverage, and the remedy for missed capacity. Review ownership changes and fluid availability over the system life. The strongest technical offer can still fail a project if a replacement pump, seal, or full fluid charge cannot arrive.
Evidence that changes the landscape
Named production deployments, multi-year material results, written server approvals, repeat orders, manufacturing expansion, and operator-reported performance strengthen a supplier's position. A memorandum or temporary proof of concept is useful but narrower. Product retirement, loss of fluid supply, unresolved warranty changes, or removal from operating sites should reduce confidence.