Best smart thermostats

Shortlist and buying guide · the ranked board is on its way

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What to look for

Check it works with your boiler; room-by-room control needs smart radiator valves as well.

Models worth comparing

From manufacturers' specifications and published UK reviews, read on 6 October 2026. Not tested by us. In no particular order: these are not ranked, and we do not say which is best until the customer ratings are in.

Budget

Drayton Wiser Smart Room Thermostat Kit (2nd Gen, 1 Channel)

Combi boiler owners who want app and voice control with no subscription, and room to add radiator controls later.

No subscription fee
Works with relay and OpenTherm boilers
Heating can still be controlled at home if the internet drops

Watch out for: This kit suits combi boilers only, and voice control is listed for Alexa and Google Assistant but not Apple Home.

Hub: HubR included
Boiler type: Combi (1 channel)
Works with: Amazon Alexa, Google Assistant
Thermostat power: 2 x AA batteries
Subscription: None

Check price on Amazon

Sources: Maker product page

Mid-range

Hive Thermostat

Households wanting a well-known system that controls heating and hot water and works with every major voice assistant.

Controls heating and hot water from the app or the thermostat
OpenTherm support on compatible combi boilers
Can grow to six zones on multizone systems

Watch out for: Budget alerts and efficiency monitoring sit behind the paid Hive+ membership.

Hub: Hive Hub included
Boiler type: Most UK gas and LPG systems
Works with: Amazon Alexa, Google Assistant, Apple HomeKit
Thermostat power: 4 x AA batteries
Subscription: Optional (Hive+)

Check price on Amazon

Sources: Maker product page

Premium

tado Wireless Smart Thermostat X (2nd Gen) Starter Kit

Smart home fans who want Matter support and plan to add room-by-room radiator control later.

Matter and Thread support, with the receiver acting as a Thread border router
Controls heating and hot water cylinder schedules, with OpenTherm
Slim design with a rechargeable battery

Watch out for: Automatic geofencing, preheating and other smart automations need tado's paid AI Assist subscription.

Hub: Wireless receiver included (Thread border router)
Boiler type: Combi, system and conventional
Works with: Matter platforms, Amazon Alexa
Thermostat power: Rechargeable battery (USB-C)
Subscription: Optional (AI Assist)

Check price on Amazon

Sources: Maker product page

Pro

Honeywell Home evohome

Larger homes that want true room-by-room zoning fitted by a heating professional.

Up to 12 separately controlled heating zones
Hot water control and an OpenTherm boiler bridge
Wireless, so no new cable runs between rooms

Watch out for: Full zoning means fitting a controller on each radiator, so installation is more involved than a single thermostat swap.

Zones: Up to 12
Boiler type: Boilers, plus heat pumps on the WiFi model
Hot water: Yes

Check price on Amazon

Sources: Maker product page · TechRadar review

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