Danfoss is a Danish engineering group headquartered in Nordborg, and its heating division sells smart radiator thermostats and floor heating controls. The range is split into separate systems: Danfoss Ally, Icon and Icon2, the older Danfoss Link, and the Bluetooth-only Danfoss Eco, each with its own app.
Danfoss Ally, the current system, uses Zigbee 3.0 radiator thermostats and room sensors that talk to an Ally Gateway. The gateway connects to the internet by Ethernet cable only and links the system to Danfoss's cloud, where the Ally app and voice assistants reach it. Icon2 floor heating joins the same app, Danfoss Link is an older central controller that Danfoss now steers new buyers away from, and Eco is a stand-alone Bluetooth thermostat with no gateway.
That suits heating that you control from a phone and with Alexa or Google Assistant, and Zigbee users can also pair the thermostats to a non-Danfoss Zigbee setup. It is less simple if you want Apple Home, SmartThings, IFTTT or Matter: Danfoss states that Ally and Link do not support the first three, and we found no Matter support.
Connection
Zigbee 3.0 via an Ethernet gateway (Ally, Icon2); Bluetooth (Eco)
Voice assistants
Alexa and Google Assistant (Ally); Alexa only (Link)
Matter
Not found
Open platforms
Cloud API on the Danfoss developer portal; community integrations
What can be connected
Radiators Ally radiator thermostats and room sensors; Eco Bluetooth thermostats; Link Connect thermostats
Floor heating Icon and Icon2 controls with room thermostats, joined to the Ally app
Heat source and power Ally boiler relay, 24V power module and the Ally Gateway
The current app for Ally systems and Icon2 floor heating. Controls schedules and temperatures and monitors heating from anywhere, with Alexa and Google Assistant voice control. The App Store listing says it works with the Ally Gateway, Ally thermostats and room sensor, and Icon2, and requires iOS 12.2 or later. Published by Danfoss A/S. The Android link uses the package name shown on a Similarweb analytics page, and we could not load the Google Play page itself.
The app for the Bluetooth-only Eco thermostat. Danfoss's support page says range is about 10 metres, one thermostat is controlled at a time, scheduling needs the app and firmware updates arrive over Bluetooth. The App Store listing says it is compatible with the 2nd generation Eco and requires iOS 11 or later. Danfoss says an Android version exists, but we found no store link for it.
The app for Danfoss Link CC panels with Wi-Fi. It adjusts heating from away from home and sets room or zone temperatures. The App Store listing says it requires iOS 11 or later and the latest version dates from October 2023. Published by Danfoss A/S. The Android link uses the package name shown on a BlueStacks page, and we could not load the Google Play page itself.
A commissioning app that installers use to set up Icon2 systems. Danfoss's Icon2 page describes it as an app for installation and says it can check whether a main controller is affected by a recall. We found no store link, and day-to-day control goes through the Danfoss Ally app.
Ally and Icon2 devices are Zigbee 3.0 certified, and Danfoss says the Ally devices can work with third-party Zigbee systems. A Zigbee repeater can extend range from the gateway to the thermostats. Zigbee2MQTT documents how to pair the Ally radiator thermostat without Danfoss's gateway. The Icon2 page also lists a Zigbee cluster specification and firmware for Zigbee integration partners.
The Ally Gateway connects to the internet only by Ethernet cable and does not support Wi-Fi, though the phone and gateway must be on the same Wi-Fi network during pairing. Danfoss Link CC panels with Wi-Fi support the 2.4 GHz band only, and Danfoss's Link page does not mention Ethernet.
The Danfoss Eco thermostat connects to its app over Bluetooth, with a stated range of about 10 metres, and receives firmware updates the same way. It is a stand-alone system. We found no Bluetooth function on the Ally pages we read.
Danfoss describes communication between the Link controller and its thermostats as radio-based, with repeaters to extend range. The pages we read do not name the radio technology.
Not mentioned on the Ally, Icon2, Eco or Link pages or the Ally app listing. We did not find a Danfoss Matter announcement, but we did not run a dedicated search for one.
Danfoss's Ally page says voice control works through Google Assistant, with binding instructions and sample commands, but also says Google Home is not supported as a platform. The Link page says Google Assistant is not supported for Link.
Documented for Ally, with binding instructions and sample commands, and listed in the Danfoss Ally app listing. For Link, Danfoss's page says Alexa is the only supported assistant, in five languages and with availability varying by market. It reads and sets room temperatures but cannot change thermostat modes.
We did not confirm a built-in Danfoss integration, since Home Assistant's own integrations page was not opened. A community custom component, Danfoss Ally by MTrab, installs through HACS and covers Ally radiator thermostats and Icon devices through the Ally Gateway. It needs a consumer key and secret from Danfoss's developer portal, and its notes say cloud sync is not real time. The repository does not show any Danfoss endorsement. Zigbee2MQTT is a local alternative for the radiator thermostat, and a Home Assistant forum thread reports partial results pairing an Icon2 Main Controller over ZHA or Zigbee2MQTT.
Two community apps for Homey Pro, neither by Athom or Danfoss. Danfoss Ally by a community developer is a port of the Home Assistant component, uses the Danfoss cloud API with a free developer account, still needs the Ally Gateway, and was live in the Homey App Store from 5 January 2026 according to its author. A separate Danfoss Icon app pairs the Icon2 controller through the Danfoss Zigbee module, and users report some bugs. Neither thread mentions Homey Cloud or a Homey Bridge, so we could not confirm either point.
We did not find a Danfoss Ally binding and did not check openHAB's add-on list.
Searched, no source
Node-RED
Community
No dedicated node found. Zigbee2MQTT exposes the Ally radiator thermostat through MQTT topics that Node-RED can subscribe to, though we did not test this.
We did not find a Danfoss plugin and did not check Domoticz's documentation.
Searched, no source
Control4
Unconfirmed
We did not find a Control4 driver for Danfoss in the pages we checked.
Searched, no source
Danfoss Ally API
Official
Danfoss says the Ally Cloud API lets partners and developers build on Ally products, and that other systems can read data through an open API, with details on its developer portal. The portal lets public users create a login, register an app and get a key and secret, then request OAuth 2.0 access tokens. Danfoss states it does not support private API solutions. The API is cloud-based, and the portal page names Ally only in a sample request path.
Checked 11 November 2026 against the brand's own pages, app store listings and each project's own page. “Not found” means we searched and found nothing, not that it is impossible. Compatibility changes often. Spot an error? Tell us and we will fix it.
Common questions about Danfoss
Does Danfoss support Matter?
Unconfirmed. Not mentioned on the Ally, Icon2, Eco or Link pages or the Ally app listing. We did not find a Danfoss Matter announcement, but we did not run a dedicated search for one.
Does Danfoss work with Alexa?
Yes, officially. Documented for Ally, with binding instructions and sample commands, and listed in the Danfoss Ally app listing. For Link, Danfoss's page says Alexa is the only supported assistant, in five languages and with availability varying by market. It reads and sets room temperatures but cannot change thermostat modes.
Does Danfoss work with Google Home?
Yes, officially. Danfoss's Ally page says voice control works through Google Assistant, with binding instructions and sample commands, but also says Google Home is not supported as a platform. The Link page says Google Assistant is not supported for Link.
Does Danfoss work with Apple Home (HomeKit)?
Not that we could find. Danfoss's support pages for Ally and Link state that Apple HomeKit is not supported.
Does Danfoss work with Home Assistant?
Yes, through a community-built integration. We did not confirm a built-in Danfoss integration, since Home Assistant's own integrations page was not opened. A community custom component, Danfoss Ally by MTrab, installs through HACS and covers Ally radiator thermostats and Icon devices through the Ally Gateway. It needs a consumer key and secret from Danfoss's developer portal, and its notes say cloud sync is not real time. The repository does not show any Danfoss endorsement. Zigbee2MQTT is a local alternative for the radiator thermostat, and a Home Assistant forum thread reports partial results pairing an Icon2 Main Controller over ZHA or Zigbee2MQTT.
Does Danfoss work with SmartThings?
Not that we could find. Danfoss's support pages for Ally and Link state that Samsung SmartThings is not supported.
Does Danfoss work with Homey?
Yes, through a community-built integration. Two community apps for Homey Pro, neither by Athom or Danfoss. Danfoss Ally by a community developer is a port of the Home Assistant component, uses the Danfoss cloud API with a free developer account, still needs the Ally Gateway, and was live in the Homey App Store from 5 January 2026 according to its author. A separate Danfoss Icon app pairs the Icon2 controller through the Danfoss Zigbee module, and users report some bugs. Neither thread mentions Homey Cloud or a Homey Bridge, so we could not confirm either point.
Does Danfoss work with Hubitat?
Unconfirmed. We did not find a Danfoss driver and did not check Hubitat's documentation.
Answers come from the sourced table above. See how Danfoss compares with all brands on the smart home brand statistics page.