Making a little energi go a long way

Heat Interface Unit

Tried. Tested. Trusted.

Danfoss FlatStation Heat Interface Units are suitable for small one bedroom apartments up to large commercial applications. Please contact us for design, sizing and selection.

Why choose Danfoss FlatStations

Key features and benefits

Proven Solution

Danfoss FlatStations are the most installed HIU in the UK, backed by decades of field-proven performance, operational experience and continuous product development.

Quality

Danfoss maintains the highest quality and reliability standards, adhering to ISO 9001, ISO 14001, and the automotive industry’s stringent ISO/TS 16949 standard, implemented in 2015.

Danfoss DNA

FlatStations must demonstrate expert control of pressure, flowrate, heat transfer and temperature. Danfoss regard these four competencies as their DNA.

Key data for the HIU product range

Heat Interface Unit product range

1 Series - NOVI

1 Series - NOVI

• Suitable for individual dwellings or multiple small dwellings

• Instant proportional DHW demand response

• Thermostatically controlled for stable temperature output​

• Built in mechanical keep-warm ~ 8°C below set point​

• Hot water recirculation compatible​

• Built in shock absorber to prevent damage from water hammer

• Fully insulated EPP cover, minimizing heat loss in the HIU

FlatStation Capacity Examples

DHW PHEX Size Heat Network Supply (°C) CW / DHW (°C) DHW Capacity (kW) DHW Flowrate (l/min) Heat Network Return (°C) Pressure Loss (kPa)
1 60 10/45 44.0 18.1 17.5 45
1 60 10/50 42.0 15.1 20.9 45
1 70 10/50 51.0 18.4 17.3 40
2 60 10/45 50.0 20.6 16.1 35
2 60 10/50 47.0 16.9 19.1 35
2 70 10/50 58.0 20.9 15.9 35
3 60 10/45 51.0 21.0 15.0 30
3 60 10/50 48.0 17.3 17.6 30
3 70 10/50 63.0 22.7 14.9 30

Downloads

Key Features

Danfoss FlatStation Heat Interface Units

Danfoss FlatStation Heat Interface Units

A partner through the full project lifecycle

Our approach is built around practical and technical support, clear advice and long-term partnership, not just about supplying products.

Engineered to the highest standards

Precision engineering, premium components and uncompromising quality. Every Danfoss FlatStation HIU is created with one goal in mind: delivering exceptional performance, reliability and efficiency throughout the lifetime of the heat network.

Information about our product

Frequently asked questions

What are Danfoss FlatStation Heat Interface Units suitable for?+

Danfoss FlatStation Heat Interface Units are versatile solutions designed to accommodate a wide range of applications, from small one-bedroom apartments to large commercial installations. Whether you require a heating solution for individual dwellings, multiple small dwellings, or commercial applications such as student accommodation, FlatStations can be tailored to your needs. For specific design, sizing and selection advice appropriate to your project, it is recommended that you contact Danfoss directly to ensure you receive the correct unit for your requirements.

What quality standards are maintained for FlatStations?+

Danfoss maintains the highest quality and reliability standards across all FlatStation products. The company adheres to three internationally recognised standards: ISO 9001, ISO 14001, and the automotive industry's stringent ISO/TS 16949 standard, which was implemented in 2015. These certifications demonstrate Danfoss's commitment to quality management, environmental responsibility, and continuous product development, ensuring that FlatStations deliver consistent, reliable performance across all applications.

What are the four core competencies that define Danfoss DNA in FlatStation design?+

Danfoss identifies four core competencies as fundamental to their FlatStation DNA: expert control of pressure, flowrate, heat transfer, and temperature. These four competencies are considered essential to the performance and reliability of the product. FlatStations must demonstrate mastery in each of these areas to meet Danfoss's stringent standards and deliver optimal performance in any installation, whether for domestic or commercial use.

What protective features does the FlatStation include to prevent damage?+

The Danfoss FlatStation includes several protective features designed to ensure safe and reliable operation. Notably, it has a built-in shock absorber specifically designed to prevent damage from water hammer, which can occur when water flow is suddenly stopped or changed. Additionally, the unit features a built-in mechanical keep-warm function that maintains the system at approximately 8°C below the set point, and it is fully insulated with an EPP cover that minimises heat loss within the Heat Interface Unit itself.

What is the maximum supply temperature and pressure rating for FlatStation units?+

Danfoss FlatStation Heat Interface Units have a maximum supply temperature of 99°C and a maximum nominal pressure of 16 bar for thermostatic models, with electronic models capable of handling up to 25 bar. The units feature a maximum differential pressure rating of 6 bar for thermostatic versions and 16-20 bar for electronic versions. These specifications ensure the FlatStation can operate effectively across a diverse range of heat network conditions whilst maintaining safety and reliability.

Heat and Power documents

Relevant links and downloads

Datasheets

Access product datasheets with key technical information, performance data and requirements for our Heat and Power solutions.

Specifications

Browse detailed product specifications to support system design, project planning and technical compliance across a range of applications.

Design Guides

Explore practical design guidance, best practices and expert advice to deliver efficient and effective Heat and Power systems.

Technical Guides

In-depth technical resources covering commissioning, operation and maintenance to support every stage of your project.

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