Danfoss Cooling
Interface Unit (CIU)

Tried. Tested. Trusted

Danfoss Cooling Interface Units are suitable for small one bed apartments up to major commercial applications that require a hydraulic break.

For direct cooling systems (no hydraulic break), the SAV Monolink is used to allow for flushing, flow limiting, energy measurement and credit management and billing if required. Please contact us for sizing, selections, and more information.

Cooling Interface Units product range

In this table you will see all the relevant key statistics for the CIU product range:
Category Danfoss 4 Series Monolinks 4 Series
Type Indirect Cooling Direct Cooling


Built to last.

Danfoss Cooling Interface Units go through comprehensive quality assurance and are built to standards that adhere to ISO/TS 16949:2009 (Quality management system requirements for the design and development, production and, when relevant, installation and service of automotive-related products). Danfoss FlatStations are the tried, tested, and trusted solution within UK, due to it standing the test of time in Denmark, a country with decades of heat network experience and knowledge.


Born with Danfoss DNA.

The most important design objective for a 4G Heat Network (HN) is to consistently achieve low return temperatures under all operating conditions. To accomplish this, the heat interface units (HIUs) must demonstrate expert control of pressure, flowrate, heat transfer and temperature. Danfoss regard these four competencies as their DNA.

Easy to use.

Built around the user.

Danfoss FlatStations are easy to install, commission and service. They require no specialized equipment to set-up and begin delivering heat efficiently and reliably to the consumer.


Always by your site.

Whether from the initial brief and employers’ requirements (ER), to detailed design, commissioning, and handover, to ongoing operation and site support.

Cooling Interface Units documents

Please find relevant links for further reading below, or visit our downloads page.

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