Records reviewed Sept. 4, 2026

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Coolant distribution unit • Product

Rittal CDU In-Row

A liquid-to-liquid coolant distribution unit for an Open Rack v3 footprint, stated at 1,000 kW at 4 K and 1,500 kW at 6 K.

CDU1.5 MWOCP Open Rack v3modular

Direct answer

What this record says

Rittal CDU In-Row is a cooling product from Rittal. The supplier publishes a capacity of 1,000 kW at 4 K approach; 1,500 kW at 6 K approach, not yet reviewed as a normalized claim. Its lifecycle status is available. Last reviewed Sept. 4, 2026 against 2 sources.

2 sourcesReviewed Sept. 4, 2026
Manufacturer
Rittal
Rated capacity
1,000 kW at 4 K approach; 1,500 kW at 6 K approachNo duty point stated
Total flow
Up to 1,500 liters per minute
Status
Available

Product brief

What the record shows

The CDU In-Row is Rittal's liquid-to-liquid coolant distribution unit for direct-to-chip cooling, built to sit in an Open Compute Project Open Rack v3 frame. Rittal publishes the capacity twice, at two approach temperatures: 1,000 kW at a 4 kelvin approach and 1,500 kW at 6 kelvin. Quoting both duty points lets a reader see what a wider approach buys.

Flow reaches 1,500 liters per minute. The cabinet is 600 mm wide, 1,400 mm deep and 2,300 mm tall, so a megawatt of duty fits a single rack position. The unit is modular, which Rittal presents as buying capacity as load arrives rather than in advance, and pumps, filters, sensors and controllers are hot-swappable so a service visit does not stop the row.

It can be installed in the data hall or in a separate technical zone. Rittal also lists a smaller in-rack unit at up to 200 kW and 225 liters per minute for sites that want to start at one rack. Public material does not state the electrical load, pressure drop, secondary fluid, or the capacity that remains during a pump exchange.

Ask for a selection at the site's facility-water temperature, and for the fallback behaviour Rittal refers to but does not describe.

Capacity figures are supplier-reported unless the source says otherwise. Compare products at the same temperatures, flow, pressure, and redundancy state.

SpecificationSupplier-stated
Standard
OCP Open Rack v3Supplier wording, not yet normalized
Footprint
600 × 1,400 mm, 2,300 mm tallSupplier wording, not yet normalized
Coolant flow
Up to 1,500 liters per minuteSupplier wording, not yet normalized
Article number
3343200Supplier wording, not yet normalized
Rated capacity
1,000 kW at 4 K approach; 1,500 kW at 6 K approachSupplier wording, not yet normalized
Hot-swappable parts
Pumps, filters, sensors, controllersSupplier wording, not yet normalized
Approach temperature
4 K or 6 K as quotedSupplier wording, not yet normalized
Manufacturer
Rittal

Connected records

Compatible architecture

Technology

Direct-to-chip liquid cooling

A metal plate sits directly on each processor, and liquid pumped through it carries the heat out of the rack.

Scaling · Commonly selected for 50–150+ kW AI racks

Connected records

Equipment category

Equipment category

Coolant distribution units

The unit that stands between the building's water and the servers, controlling how much coolant flows, how cold it is, and how clean it stays.

7 tracked suppliers

Evidence ledger

Sources and evidence

The links below show where the factual claims came from. Supplier specifications remain supplier-reported unless the record names independent operating evidence.

  1. 01
  2. 02
Record information
Record ID
DCC / PROD / RITTAL-CDU-I
Record reviewed
Sept. 4, 2026
Record first published
Sept. 4, 2026
External sources
2
Search visibility
Offered to search engines

Required fields this record has not addressed yet, most important first:

  • Rating conditions
  • Facility-water supply and return
  • Public deployment evidence
  • Pressure or head
  • Redundancy
  • Deployment format

Decide between

Comparable products

The same equipment category from other manufacturers, most-evidenced first.

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Carrier CDU 65LL

A coolant distribution unit rated at 1,350 kW with a 4°C approach, offered with a heat exchanger that narrows the approach to 2°C.

Carrier · Available
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Chilldyne CF-CDU300

A coolant distribution unit that holds the server loop below atmospheric pressure, rated at 300 kW with a 7°C approach.

Chilldyne · Available
Product

Daikin Coolant Distribution Unit

A coolant distribution unit in 400 kW, 1,000 kW and 2,000 kW sizes, with an approach as narrow as 2 K and skids beyond 10 MW.

Daikin · Available

Add two or more, then open the comparison to see every stated claim, its duty point, and its source side by side.

Direct answers

Frequently asked questions

Direct answers drawn from the record, its comparison fields, and the evidence linked below.

What is the Rittal CDU In-Row?

The CDU In-Row is Rittal's liquid-to-liquid coolant distribution unit for direct-to-chip cooling, built to sit in an Open Compute Project Open Rack v3 frame. Rittal publishes the capacity twice, at two approach temperatures: 1,000 kW at a 4 kelvin approach and 1,500 kW at 6 kelvin. Quoting both duty points lets a reader see what a wider approach buys. Flow reaches 1,500 liters per minute. The cabinet is 600 mm wide, 1,400 mm deep and 2,300 mm tall, so a megawatt of duty fits a single rack position. The unit is modular, which Rittal presents as buying capacity as load arrives rather than in advance, and pumps, filters, sensors and controllers are hot-swappable so a service visit does not stop the row. It can be installed in the data hall or in a separate technical zone. Rittal also lists a smaller in-rack unit at up to 200 kW and 225 liters per minute for sites that want to start at one rack. Public material does not state the electrical load, pressure drop, secondary fluid, or the capacity that remains during a pump exchange. Ask for a selection at the site's facility-water temperature, and for the fallback behaviour Rittal refers to but does not describe.

Who makes the Rittal CDU In-Row?

Rittal makes it. We file it under coolant distribution units, and its status is available.

What are the key specifications for the Rittal CDU In-Row?

Standard: OCP Open Rack v3; Footprint: 600 × 1,400 mm, 2,300 mm tall; Coolant flow: Up to 1,500 liters per minute. These figures come from the supplier. Before comparing two products, restate both at your own water temperatures, flow, pressure, and redundancy, because a rating measured under favorable conditions will not hold on site.