Which smart thermostats work with Alexa or Google Assistant?

The compatibility is the easy part. What voice control actually does is narrower than the marketing suggests: it switches a zone or sets a temperature, and everything else, the schedules, the zoning, the boiler modulation, still runs through the manufacturer's app and, in most cases, the manufacturer's cloud. That is the dependence a household keeps even after the thermostat is on the wall.

This page sets out which brands work with which assistants, what the voice layer adds, and where the system stops working when the internet does.

Which brands work with Alexa and Google Assistant

The list of compatible UK heating controls is longer than the four or five names that dominate the market. Baxi lists its AmbiZen thermostat as working with Alexa, Google Assistant and IFTTT⁶. Herschel states that its iQ MD2 wired thermostat works with Alexa and Google Assistant when paired with the SmartLife app⁷. Tansun lists Amazon Alexa and Google Assistant support on its digital thermostat⁸. Homematic IP states that voice control via Amazon Alexa and Google Assistant is available across its glass wall thermostat, its basic wall thermostat and its glass wall thermostat with CO₂ sensor⁹.

For electric and infrared heating, Sundirect states that integration with Alexa or Google Home enables hands-free control on its Wi-Fi-enabled wireless thermostats, and lists voice control by Alexa or Google Home on its Smart2.0 Pro model¹².

The pattern is that voice support has become a baseline expectation rather than a differentiator. Where brands differ is in the standard underneath. tado° builds on Matter, which means the thermostat can be paired directly with a platform rather than through a brand-specific skill¹. Hive states that its thermostat supports Amazon Alexa, Google Home and Apple Home but does not currently support Matter¹. Wiser lists Matter alongside Amazon Alexa and Google Assistant². That distinction matters less today than it will over time: Matter is the route by which a control stays reachable from platforms that have not yet been built.

What voice control actually does once connected

Once a thermostat is linked, Alexa and Google Assistant can set a temperature, switch a zone on or off, and read the current temperature. Hive describes the effect plainly: most smart thermostats now link with virtual assistants like Alexa, so anyone can turn the heating up or down with their voice even without the app¹⁴. That is the whole of the function. It does not schedule, it does not balance zones against each other, and it does not decide when to fire the boiler.

The value is in the household rather than the energy bill. A voice command removes the need to find a phone, unlock it, open an app and navigate to a room. For anyone who finds app interfaces awkward, or who wants to adjust a room while carrying something, that is a real change in how the heating is used. It also means a guest or a family member without the app can adjust a zone.

What it does not change is the underlying dependence. A voice command travels from the speaker to the manufacturer's cloud, then back to the thermostat. If the broadband drops, the command does not arrive. Hive states that if the internet connection goes down, the Hive Thermostat continues to work with the thermostat switching the heating on and off as normal, but app control is unavailable until the internet returns¹⁵. tado° states that Smart Schedules on the Smart Radiator Thermostat X continue to run when not connected to the internet because they are saved locally on the device⁵.

That local schedule storage is the meaningful distinction for a household thinking about independence. A thermostat that holds its schedule on the device keeps heating the home through an outage. A thermostat that depends on the cloud for its schedule does not.

tado° X: Matter support across Alexa, Google Home, Apple Home and SmartThings

tado° has built its X range on Matter, and states the position consistently across its documentation. The Smart Thermostat X connects natively with Apple Home, Google Home, Amazon Alexa and Samsung SmartThings¹. The Smart Radiator Thermostat integrates with Apple HomeKit, Google Home, Amazon Alexa and Samsung SmartThings via Matter for voice control¹⁶. The company states that its thermostats are compatible with all the major smart home platforms, including Amazon Alexa, Google Home and Apple HomeKit¹⁷, and that the X range uses Matter so it works with Google Home, Apple Home, Amazon Alexa and Samsung SmartThings¹⁸.

The practical consequence is that a tado° X device can be added to a platform directly rather than through a tado°-specific integration. If a household changes assistant, or runs two, the hardware does not need to change.

tado° also states that Google recommended seeking out third-party devices compatible with Google Home, like the tado° Smart Thermostat X Starter Kit, to affected older Nest owners in Europe¹⁸. That is a maker's account of a recommendation, and it is specific to Europe.

On the warranty side, tado° offered an exclusive 10-year extended warranty as a special introductory offer with the tado° X range⁴. The offer has closed: tado° states that the 10-year extended warranty is no longer available for new purchases made after 30th June 2026⁴. Registration was required. Purchases made before that date sit under the terms in force at the time, and later purchases fall back to the standard warranty terms.

Wiser: Alexa and Google Assistant with no subscription

Wiser, made by Drayton, lists voice assistant support across its second-generation range without a subscription attached. The Non-relay Hub and Smart Radiator Thermostat Kit works with Amazon Alexa and Google Assistant²⁰. The Smart Room Thermostat works with Amazon Alexa and the Google Assistant²¹. The 3 Channel Smart Thermostat Kit works with both²², as does the Radiator Thermostat²³ and the 1 Channel Temperature and Humidity Sensor and Radiator Thermostat Kit²⁴.

Wiser also states that it connects heating with the smart home platforms a household already uses, and lists Matter alongside Amazon Alexa and Google Assistant². That places Wiser in the same position as tado° on the standard, with the difference that Wiser's product pages present voice support as a feature of each individual device rather than as a platform-wide claim.

No monthly fee is stated on any of those product pages. The compatibility is presented as a property of the hardware, and the hub is the piece that carries the connection. Drayton launched the Wiser 2nd Generation Radiator Thermostat on 27 August 2026, expanding the second-generation range.

For a household, the significance is that the voice layer does not add a recurring cost. The dependence that remains is the same as elsewhere: the hub needs power and a network connection, and remote control runs through Drayton's cloud.

Hive and Netatmo: voice support and what Hive+ adds

Hive states that its thermostats work with Alexa, Google Assistant, Apple HomeKit, Siri Shortcuts and IFTTT³. The Hive Thermostat and Hive Thermostat Mini are both listed as working with Amazon Alexa and Google Assistant¹⁴, and Hive states that its thermostats can link up to Amazon's Alexa or Google Assistant²⁵. The Hive Hub lists Amazon Alexa, Google Assistant, Apple HomeKit and Siri Shortcuts²⁶, and the Hive Radiator Valve lists Amazon Alexa, Google Assistant, Siri Shortcuts and IFTTT²⁷.

Not every Hive device carries voice control. Hive states that its Window/Door Sensor cannot be used with voice control such as Amazon Alexa, Google Assistant, Apple HomeKit and Siri Shortcuts²⁸. That is a sensor rather than a control, but it is worth knowing which parts of a Hive system sit inside the voice layer and which do not.

Hive+ is a separate membership. Hive ran a "Get Ready for Winter with Hive" promotion from 14 September 2026 to 5 October 2026, offering free or discounted Hive+ membership and 15% member discounts on qualifying thermostats and accessories³. Published Hive+ pricing differs between Hive documents, at £3.99 a month or £39.90 a year in one place and £19.95 in another, and the two figures are not reconciled. Basic voice control is not gated behind the membership: the thermostat compatibility is stated independently of it.

Netatmo lists Google Assistant, Alexa and Siri for its Smart Radiator Valves, which can be controlled with those voice-controlled devices²⁹. Netatmo describes its Smart Thermostat as a wireless model for control over home heating and energy bills, remotely controllable via digital devices and a smartphone³⁰. Netatmo has announced that from 1 June 2026 its products will no longer be available for purchase in the United States and Canada via its e-shop, a change that affects North American buyers rather than UK ones.

Where voice control falls short

The limits are worth stating as plainly as the benefits. Voice control adds a way to operate a system that already exists; it does not add zoning, scheduling or efficiency. A household with a single thermostat and no radiator valves can set one temperature by voice, and that is the extent of it.

Room-by-room control comes from the hardware. tado° describes multi-room control with a smart radiator thermostat on each radiator¹⁷, and Wiser sells radiator thermostat kits and room thermostats that create separate zones²⁰. Once those zones exist, a voice assistant can address them by name. Without them, there is nothing to address.

The dependence that remains is threefold. The voice assistant is a cloud service from Amazon or Google. The thermostat's remote control is a cloud service from the manufacturer. And the boiler still runs on gas or electricity from a supplier. Matter reduces the first of those by letting a device pair directly with a platform, and local schedule storage reduces the second during an outage, but neither removes the grid or the supplier.

For a household weighing independence, the questions that matter are whether the schedule is stored on the device, whether the system works without the app, and whether the manufacturer's cloud is required for day-to-day heating. Voice control is the visible layer; those three are the ones that decide what happens when the connection drops.