Smart Heating by Danfoss

Getting started with Danfoss Smart Heating is easy

  1. 1

    See if your current heating system is compatible and find the right solution you need

  2. 2

    Either install the solution yourself or have a professional installer do it

  3. 3

    Download the right Danfoss app to your smartphone

  4. 4

    Schedule your heating and start heating smarter


Looking for specific product information?
Select the product below and choose what you need

Danfoss Link™
Danfoss Eco™

Latest Software


If your Danfoss Link™ CC Central Controller is connected to the WiFi, the software will update automatically.
The latest software version is version 4.2.1724 (07.01.2020)
If your Danfoss Link™ CC Central Controller does not have a WiFi connection, you can update the software for your Danfoss Link™ model using a USB stick or SD card and download the software here:

Download latest software for Danfoss Link™ CC with WiFi (model 4) by USB stick (version 4.2.1724)
How can I check whether my Central Controller has a WiFi connection?
Overview of software


First, download the current version of the software to a USB clicking the relevant link.
Then go to your Central Controller and do the following:
1. Insert USB
2. Press the screen view Start mode
3. Select “House control”
4. Select “Settings”
5. Select “Wi-Fi and apps”
6. Select “App options”
7. Select “Software update”
8. Select “Update via USB”
9. Select “Update software now”
How do I check if my Central Controller is enabled for Wi-Fi?
Download latest software for Central Controller not Wi-Fi enabled (vers. 3.3.1)
Overview of software (English pdf)

Mini SD card

First, download the latest software version onto a mini SD card using the following link.
Then go to your Central Controller and do the following:

  1. Insert mini SD card
  2. Remove the front cover and hold the SETUP key down for three seconds to call up the installation menu
  3. Select "Software"
  4. Select "Software upgrade"
  5. Select "Start software upgrade"
  6. Select "Update software now"

Note: Central controllers from before 2010 sometimes use software version 1.x.x. In that case, you need to update your Central Controller to version 2.1.35 before updating to the latest software.
Download latest software (vers. 2.7.42)
Overview of software (English pdf)


Danfoss Link™ installation guides



How do I install or replace thermostats or adapters?

Demount old thermostat
If you have an old thermostat on your radiator, you need to dismount your old thermostats, before you can install Connect Thermostat. 
Watch video

Mount new thermostat and adapter
First, you need to identify which adapter is right for your radiator. Danfoss provides different adapters for different radiator valve types. Use the adapter selection guide by placing the different dimensions onto the valve to identify which adapter fits your valve.
The adapters supplied cover more than 90 per cent of all top mounted valves, both Danfoss and other brands. If none of the adapters fit onto your valve, it may be because your valve is old. In this case, we recommend that you buy a new valve.
Second, fit the correct adapter onto the valve. Insert batteries into your new Connect Thermostat and screw the thermostat onto the adapter and tighten. Leave mounting mode.

Please watch the how-to videos for a full explanation.

Now you are ready to create room and add devices on your Danfoss Link™ Central Controller.

What happens if there is a power outage or my device runs out of battery?

Power outage on Danfoss Link™ Central Controller
If there is a power outage, the Danfoss Link™ Central Controller will turn on, once it gets power again and will connect to your installed devices.

If the Central Controller does not get power again:
• Connect Thermostat will continue on the temperature they were at when the power outage happened
• the Room Sensor will go into frost protection mode

Connect Thermostat or Room Sensor runs out of battery
When Connect Thermostat or Room Sensor is low on a battery, a battery icon will be shown in the display and the Central Controller will give you an error message. If a Connect Thermostat or Room Sensors runs out of battery, they will go into frost protection mode.
Connect Thermostats and Room Sensors use 2 x AA non-rechargeable batteries each.

Why is there no connection between my Central Controller and one or more of my devices?

The freer passage the radio signal from the Central Controller has, the farther it can reach. House walls, metal objects, special constructions and other obstacles weaken the signal. Your Central Controller will give an alarm if it cannot reach a device for more than 1.5 hours.

If there are obstacles between your devices, you may need to install a Repeater Unit to extend the signal. If necessary, you can extend the extended signal by adding another Repeater Unit as illustrated below. You only need one Central Controller for your home.

When do I need a Danfoss Icon™ Room Thermostat?

It can measure and control the temperature at a specific spot in your home.

If you place the Icon™ Room Thermostat close to your couch or away from a window, you ensure your desired temperature at this spot, because you optimize the actual temperature measurement in the room.

We recommend adding a Icon™ Room Thermostat in rooms with multiple radiators, because the Room Sensor balances the temperature across radiators based on the room temperature.

If your radiator thermostat is covered, e.g. by furniture, the Icon™ Room Thermostat  will ensure your desired temperature in the room.

Add the Icon™ Room Thermostat  to your Danfoss Link™ Central Controller in the same room as the Connect Thermostat you want the Icon™ Room Thermostat  to be connected to.

How do I get the optimum energy savings with a Danfoss Link™ system?

Energy savings are achieved through a reduction in room temperature.As a general rule, you can save 5% of energy consumption for every degree you lower the temperature at night. We recommend, you lower the temperature 3-4 °C at night and during working hours, e.g. from 21°C to 17°C. Also, activate vacation mode when you are on holiday.

When using Connect Thermostat, the average European saving potential is up to 30% on your heat consumption. Read more here.

The older your thermostats are when exchanging them, the greater your energy savings will be.
Connect Thermostat was the first electronic thermostat ever to achieve the prestigious AA energy certificate from eu.bac.

Where can I get help with the app or Wi-Fi connection for Danfoss Link™?

Please go to our Danfoss Link™ App Helpdesk and get the assistance you need.

Why does the radiator thermostat not reach the temperature I have set?

To ensure that the radiator thermostat can reach the set temperature quickly, we recommend a difference between Away/Asleep mode and At Home mode at max. 4 ˚C.

Danfoss Link™ offers a precise and energy efficient heating regulation by adapting itself to the heating system. This takes approximately one week after installation. Therefore, during the first week you can experience fluctuations as the thermostats are learning when to start heating to reach the specific temperature at the specific time (adaptive learning).

After this period, you can enjoy the perfect temperature in your home whenever you want it.

Can Connect Thermostat and the Danfoss Link Central Controller be used in all types of buildings and homes?

The Danfoss Link™ Central Controller works in all residential units up to 300 m² with a maximum of 50 units per Central Controller (1 Central Controller + 49 units).

How many devices can I connect to a Danfoss Link™ Central Controller?

You can connect up to 50 devices in total to Danfoss Link™ Central Controller and thereof max. 30 Connect Thermostat to Danfoss Link™. Danfoss Link™ controls up to 10 devices in one room.

Can I control my Danfoss Link™ via app?

Yes, if you have the Wi-Fi version of Danfoss Link™ Central Controller. You can download the app from either App Store or Google Play.

Find out if your Danfoss Link™ supports Wi-Fi here.

Can I buy eco first and then buy Danfoss Link™ Central Controller later?

Eco is a stand-alone product. You need to use Connect Thermostat for Danfoss Link™.

Is Danfoss Link™ secure when connected to Wi-Fi?

Danfoss ensures that all the devices in your home and the cloud service we provide to your smartphone are secure at all times. The Danfoss Link™ App is developed on a Home Banking platform and so the pairing of the Danfoss Link™ App to the Danfoss Link™ Central Controller is fully secure.

Latest Software

Danfoss Eco with Bluetooth automatically updates the software in the Danfoss Eco App via Bluetooth.

The App tells the user when new software is available. Installation of the software takes approximately 1 minute.

Overview of software versions


Danfoss Eco™ installation guides


What is the difference between Danfoss Eco™ and Danfoss Link™?

Danfoss Eco™ is a stand-alone thermostat, where all control and programming functions are operated on one thermostat at a time, either by turning the thermostat itself or via Bluetooth and the Danfoss Eco App and at a maximum distance of 10 m.
Danfoss Link™ communicates wirelessly with the Connect thermostats and is compatible with other Danfoss products such as underfloor heating (both electrical and water-carried), ventilation units, heat pumps and district heating controls. Danfoss Link™ has integrated WiFi, so that you can adjust the heat via the Danfoss Link App regardless of where you happen to be.
Both of the intelligent thermostats/systems have built-in saving programs, so you can adjust them to suit your family's needs and routines.

Do electronic thermostats work on return valves?

No, electronic thermostats must be installed on one-way valves.
It is possible to switch from return flow to one-way flow on radiators without it becoming a huge operation. You can discuss your options with your local installer. With underfloor heating, unfortunately, it is not quite so easy.
Return valves were used in many district heating installations in the 1960s in particular, so it is an older technology. The advantages of changing to one-way valves are – besides having the opportunity to use electronic thermostats – that the heat can be more precisely regulated, which in turn leads to increased comfort and considerably improved energy efficiency.
We also recommend replacing older valves with valves with pre-setting in order to ensure the best possible cooling and thus energy savings in the radiator.

Do electronic thermostats work on one-pipe radiator units?

Yes – unless the valve is a double check valve, which has both one-way and return flow in the same valve. In this case you can not use electronic thermostats.

How do I mount/demount the adapter?

Demounting an old thermostat
You must demount your old thermostats before you can mount Danfoss Link™ Connect. Depending on your current thermostat you will need to use either a screwdriver or an Allen key to loosen the screw on the side of the thermostat. You can then unscrew the entire thermostat by turning it anticlockwise.

Mounting a new thermostat and adapter
First you need to find the right adapter. Danfoss supplies different adapters for the different valve types (in Denmark many valves are of the RA type). Use the adapter guide to place the different cuts of the valves and find the classification for the adapter that fits.
The video shows you how to do this

Note! Electronic thermostats are only mounted on one-way valve systems
The adapters cover more than 90% of all valve types, both for Danfoss and other manufacturers. If no adapter suits your valve, the valve is too old and we recommend replacing it with a new one.
You should then place the adapter onto the valve. Insert batteries into the Connect thermostat and mount the thermostat onto the adapter.

You are now ready to set the Danfoss Link™ Central Controller. Please follow the instructions in

Demounting an adapter
In this video we show you how to demount an adapter on both Eco™ and Connect™ thermostats:
Demount adapter

I have Danfoss Eco thermostats. Why is only one radiator heating up while the other rooms are still cold?

If the cold air hits one of your Eco thermostats, this will open immediately and start heating up the room. The other Eco thermostats will therefore not detect the cold air and thus never open.

What you should do is adjust the temperature a little on the radiators that are not presently heating up. Perhaps 'the hot one' should be set to 20 degrees and 'the cold one' to 21 degrees to bring the room to the desired temperature.

Keep trying and feeling how hot the radiators are until they reach the same level of heating and cooling
If there is more than one radiator in the same room then we recommend that you use Danfoss Link™ with Connect thermostats, as the room temperature can then be controlled via a Danfoss Link™ RS Room Sensor placed somewhere central in the room.

How does the 'Open Window' function work? Can I set the heating to turn off for a period myself?

The Open Window function is activated when the thermostat experiences a sudden drop in temperature of at least ½ degree over the course of 3 minutes. If this does not happen (if the cold 'seeps' slowly over to the thermostat) then the Open Window function will not activate.

An additional feature of Danfoss Eco™ with Bluetooth is that you can set the thermostat to turn off for a period yourself: Turn the thermostat quickly to the left so that it reads 6 degrees on the display (or the temperature you have set as frost protection).

When you want to turn the thermostat back on, you can do this easily either via the app or by turning the thermostat one notch to the right.

How can I achieve optimal energy savings with Danfoss Eco™?

Energy savings occur when you reduce the heat.

As a general rule, you can save roughly 5% of the energy consumption for every degree you turn down the heat. We recommend that you lower the temperature 3-4°C at night and during the day while the family are out, e.g. from 21°C to 17°C.

You can also use the 'Holiday Function' while you are away from home for several days, e.g. on holiday.
If you replace a 15 year-old thermostat with Danfoss Eco™ thermostats, you can save up to 23% of your heat consumption.

Read more about energy savings here.

We recommend replacing older valves with valves with pre-setting in order to ensure the best possible cooling and thus energy savings in the radiator.

Where can I get help with the Danfoss Eco App?

Please visit our App Helpdesk where you can find additional help.

Why doesn't the thermostat reach the temperature I have specified?

To ensure that the electronic thermostat reaches the desired temperature quickly, we recommend a difference between the Absent (sleeping) and Home temperatures of no more than 4˚C.

Danfoss Eco™ uses what we call an 'adaptive' function. This means that over the course of a week, the system gets to know the heating system so that it is then able to start heating up in time to reach the desired temperature at the correct time.

During the first week and seasonal transitions you will therefore experience slight fluctuations in the heat. This is completely normal and you will then be able to enjoy sleeping in a cool home while also being able to wake up to a lovely warm house – totally automatically.

How do I upgrade the software on Danfoss Eco™?

Danfoss Eco™ updates automatically to the latest software (firmware) as soon as you connect the app to the thermostat.

You can see how this is done here: Updating of firmware
If you lose the connection to the thermostat during a software update, you can find help here.

Can I buy Danfoss Eco™ first and then purchase a Danfoss Link™ Central Controller later?

Danfoss Eco™ is a stand-alone product, where you set the programming and controls on the individual thermostat.
You can use the Danfoss Link™ Connect thermostat together with Danfoss Link™.

How many smartphones can be connected to the Danfoss Eco™ App? And which smartphones can be used?

There is no limit to how many Danfoss Eco™ thermostats can be controlled from one smartphone.
And there is no limit to how many smartphones can control one thermostat.

The Danfoss Eco™ App can be downloaded to iPhone and Android devices. Unfortunately, the App cannot be obtained for Windows telephones.

Can I turn off the heating completely on Danfoss Eco™?

No, you cannot turn the thermostat down further than 5 degrees, which is the minimum temperature for frost protection mode.

The frost protection mode is set in the Danfoss Eco App: Select Menu – Select Settings – Select Limits – Set Min. temperature (can be a minimum of 5 degrees).

Can I turn off the heating in the summer?

You can do three things when the temperature rises in the summer and you wish to turn off the heat:

1. You can set the entire house on an indefinite break. This will turn the thermostats down to the frost protection temperature of 6 degrees. If it gets cold one night, you can quickly interrupt the break and warm it up.

2. You can set a holiday period, so the heat is reduced to the specified reduced temperature.

3. You can specify a lower comfort temperature, so heating first kicks in when it is colder than the specified temperature. This temperature is reset when the air gets colder.

My thermostats have worked themselves loose. What should I do?

1. Check that you have the correct adapter mounted

2. Check that the valve adapter is correctly screwed onto both the valve and the actual electronic thermostat. Screw tighter if necessary.

I get an 'E9' error message. What does this mean?

E9 means that the valve cannot close. So it is not an error in the thermostat itself, but rather a message that there is something wrong in the installation.

Possible sources of the error could be incorrect installation, the wrong adapter, or dirt in the valve. If necessary, get help with troubleshooting from a heating installer.

Compatible solutions
for every heating need

Our smart heating solutions are compatible with almost any kind of heating application from radiators to hydronic and electrical floor heating

Learn more

Every home can be heated smarter

Need help finding the right solution?
5 easy steps and you know everything you need

Find the right solution here

How to get a Danfoss Smart Heating Solution

Buy online. Delivered to your home

Buy it today at your local retailer

Find store

Find a Professional Installer

Get in contact

Offer received from an installer:

The number of radiators is required The number of rooms with HFHS is required The number of rooms with EFHS is required The first name is required The last name is required You must enter a valid email address You must validate an email address
The street is required The house number is required The company code is required The city is required The phone number is required The date available is required The country is required