Editorial Technical Reference

Cooling pump (the redundant pumps that circulate coolant through a data-centre liquid cooling CDU)

Pumps that circulate coolant to direct-to-chip cold plates in data centres · the pump set inside a coolant distribution unit (CDU), N+1 redundancy run/standby or together, variable speed, flow per kilowatt, stainless wetted parts and fine filtration

Direct-to-chip liquid cooling pushes coolant through cold plates on CPUs and GPUs, and the pumps that do it sit in a coolant distribution unit (CDU) between the facility water and the technology cooling loop. If those pumps stop, the servers lose cooling within moments, so they are bought in redundant sets with variable speed and clean, corrosion-resistant wetted parts. Specify the heat load and approach temperature, the flow and pressure the cold-plate loop needs, the redundancy and how it switches, and the filtration and materials on the loop.

Pumps and pump sets for data-centre liquid cooling: the technology cooling loop pumps in coolant distribution units serving direct-to-chip cold plates, with redundancy, speed control, flow and pressure, materials and filtration. Cooling-water circulation pumps for industrial loops are covered on the Cooling-water circulation pump page; glycol chiller loop pumps on the Glycol coolant pump page; machine-tool coolant on the High-pressure coolant systems page; centrifugal pump hydraulic selection on the Industrial pumps page.

CNFX editorial research · Sources checked October 12, 2026 · 4 sources

Flow and pressure per kW Redundancy and cleanliness

Stainless steel close-coupled centrifugal pump with a grey electric motor on a steel base, flanged suction and discharge pipes, a ball valve and braided hose, with blue articulated coolant hoses behind — Stainless centrifugal pump in a coolant piping skid

Start with your task

Flow and pressure per kWGPM, LPM, approach. Redundancy and cleanlinessN+1, speed, filters, stainless.

Flow and pressure against heat load

The Open Compute Project lists the STULZ Deschutes CDU, based on the Google Deschutes 5.0 specification, at "2MW @ 3°C ATD", "500 GPM (1890 LPM)" and "80 PSI Available Pressure", with a brazed plate heat exchanger and full isolation between facility water and the technology cooling circuit. [1] Boyd's 4U CDU has "a typical capacity of 80 kW" with a technology cooling loop flow range of 10-100 LPM and a pressure drop set range of 30-150 kPa. [3]

Editorial calculation from the OCP listing: 1,890 LPM for 2,000 kW is about 0.95 LPM per kW; with water (assumed density 1 kg/L and specific heat 4.18 kJ/kg·K) that flow of 31.5 kg/s carries 2,000 kW with a coolant temperature rise of about 15 K across the loads. Coolant mixtures such as PG25 change these figures; use the server maker's flow per kW. [1]

CDU	Capacity	Loop flow	Pressure	Source
STULZ Deschutes (OCP)	2 MW @ 3 °C approach	500 GPM (1,890 LPM)	80 psi available	[1]
Airedale by Modine CDU	Up to 2 MW +	Not stated on page	Not stated on page	[2]
Boyd 4U CDU	"a typical capacity of 80 kW"	10-100 LPM	30-150 kPa set range	[3]

Give the heat load per rack and in total, the coolant (water or glycol mix), the cold-plate pressure drop and flow per server from the server maker, and the facility water temperature.

Redundancy, speed control, materials and filtration

The STULZ unit has "N+1 Sealless Pumps" with "Fully redundant power feeds for each pump circuit", variable-speed pump technology and "0.2 µm Side Stream Filtration". [1] Airedale by Modine fits "N+1 pumps, drives and filters", pumps "Operating in a run/standby configuration or simultaneously", and stainless 304 SCH5S pipework "including pumps"; a maintenance mode allows filters to be serviced. [2]

Boyd lists N+1 redundancy for pump, fan and power supply, "Pump speed-control for increased energy efficiency" and "Pump dry-run protection for added reliability". [3] Jianen, a Chinese stainless fittings maker, lists data centre liquid cooling pumps alongside liquid cooling manifolds, filters, fittings and check valves. [4]

State whether redundant pumps run together or as duty/standby, how switchover is detected and how fast, the power feeds per pump, the wetted materials, and the filtration grade on the technology cooling loop.

CDU pump details

Paste it into your enquiry below or into an email to a maker, then replace every bracket.

Load: [kW per rack; total]
Coolant: [water; PG25; other]
Flow: [LPM total; per server]
Pressure: [available at loop; cold-plate drop]
Redundancy: [N+1; run/standby or simultaneous; power feeds]
Control: [variable speed; dry-run protection]
Materials: [stainless; seals or sealless]
Filtration: [µm; side stream]

See manufacturer records Send an enquiry through CNFX

Liquid cooling pump sources

1 company lists this product among what they make. Company figures are quoted from each company's own website; every card states where the relationship came from.

Jianen Sanitary

Manufacturing site to be confirmed for the order

Lists data centre liquid cooling pumps with liquid cooling manifolds, filters, fittings and check valves.

Product scope checked 2026-10-12

Current product source ↗

Data centre liquid cooling pump listing · profile compiled by CNFX from public sources

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Explore company information and manufacturing capabilities, then discuss the scope of your project with a relevant supplier.

Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review · Page last updated 13 October 2026

Buyer questions

How much flow does a liquid cooling loop need?

The OCP-listed STULZ CDU moves 1,890 LPM for 2 MW at 3 °C approach, about 0.95 LPM per kW by editorial calculation; use the server maker's figures. [1]

How are CDU pumps made redundant?

With N+1 pumps; Airedale runs them run/standby or simultaneously, and STULZ gives each pump circuit its own power feed. [2] [1]

Why stainless and fine filtration?

Airedale uses stainless pipework including the pumps, and STULZ adds 0.2 µm side-stream filtration on the loop. [2] [1]

What protects a pump from running dry?

Boyd's 4U CDU includes pump dry-run protection. [3]

Sources and what still needs a direct check

Sources checked 2026-10-12. The Open Compute Project marketplace lists the STULZ Deschutes CDU; Airedale by Modine and Boyd publish their CDU pages and datasheet; Jianen lists its liquid cooling components.

Open Compute Project — STULZ Deschutes CDU, CyberCool liquid cooling distribution unit ↗ Industry marketplace listing Return to text ↑
Airedale by Modine — Coolant distribution unit (CDU) ↗ Maker product page Return to text ↑
Boyd — 4U Cooling Distribution Unit (CDU) technical datasheet ↗ Maker datasheet Return to text ↑
Jianen — Products (data centre liquid cooling) ↗ Maker product listing Return to text ↑

Still to check yourself

Fix heat load and coolant.
Get flow and pressure per server.
Choose redundancy mode.
Specify materials and filtration.
Check dry-run and power feeds.
Verify the legal supplier and factory.

Buyer enquiry

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