The best smart thermostat for most UK homes in 2026 is one that talks properly to your boiler, fits the way your heating is piped, and does not lock useful features behind a subscription you do not want. For most combi boiler homes that means tado X, Hive or Drayton Wiser, for bigger houses that need room-by-room control it means Wiser or Honeywell Home evohome, and for owners of a newer Vaillant or Ideal boiler the manufacturer’s own control is often the best match.

What a smart thermostat actually does

A standard room thermostat switches the boiler on when the room drops below the set temperature and off again when it reaches it. A smart thermostat does the same job but connects to your home Wi-Fi, so you can change the temperature and schedule from an app, see what the heating is doing, and in many cases let it react to whether anyone is at home.

The useful features to look for are:

• App and schedule control: change the heating from anywhere and set different times for weekdays and weekends.
• Geofencing: the app uses your phone’s location to turn the heating down when the last person leaves and back up as you head home.
• Hot water control: needed if you have a system or regular boiler with a hot water cylinder. Combi boilers heat water on demand, so a combi only needs heating control.
• Room-by-room zoning: smart radiator valves let each room have its own temperature and schedule.
• OpenTherm or load compensation: instead of switching the boiler fully on and off, the thermostat tells the boiler how hard to work. The boiler runs cooler and longer, which suits a condensing boiler and usually uses less gas.

If you want one fitted and wired correctly first time, our smart thermostat installation service covers the survey, the wiring and setting it up with you.

The best smart thermostats in 2026 compared

Thermostat	Best for	Hot water control	Talks to boiler by	Subscription
tado X	Most homes, smart home fans	Yes, with the hot water version	On/off relay or OpenTherm	Optional (AI Assist) for automatic geofencing and extras
Hive Thermostat	Simple, familiar app	Yes, on cylinder systems	On/off relay, OpenTherm on compatible boilers	Optional (Hive+)
Drayton Wiser	Room-by-room zoning without fees	Yes, on two and three channel kits	On/off relay, OpenTherm on combi kit	None
Honeywell Home evohome	Larger homes, many zones	Yes	On/off relay	None
Vaillant sensoROOM with myVAILLANT	Vaillant boiler owners	Yes, via the boiler	Vaillant’s own connection	None
Ideal Halo Combi Wi-Fi	Ideal combi owners	Not needed on a combi	Designed for Ideal boilers	None

tado X

tado’s current range runs on Thread and works with Matter, so it links to Amazon Alexa, Google Assistant and Apple Home. The UK starter kit with hot water control includes a programmer that works with both simple on/off wiring and OpenTherm boilers. Adding Smart Radiator Thermostat X heads gives you room-by-room control. The catch is that the automatic features, including geofencing that turns the heating down on its own when you leave, are part of tado’s optional paid AI Assist subscription. Without it the app still gives you full manual and scheduled control.

Hive Thermostat

Hive is the one many people already know. The kit includes a hub and a receiver that wires in at the boiler. It controls heating and, on cylinder systems, hot water, including a boost button. Hive supports OpenTherm on compatible boilers, works with Alexa, Google Assistant and Apple HomeKit, and can be extended to up to six zones with Hive Multizone. Some extras, such as schedule suggestions and budget tracking, need the optional Hive+ subscription. Hive radiator valves are available separately.

Drayton Wiser

Wiser is our pick for anyone who wants proper room-by-room control without an ongoing subscription. The HubR sits at the heart of the system and comes in one, two and three channel versions to suit combi, system and regular boilers. Add smart radiator thermostats to each room and a room thermostat or sensors where you need them. On a combi, the one channel kit can use OpenTherm through a communication module on the back of the hub, which needs to be wired by a heating engineer.

Honeywell Home evohome

evohome has been around a long time and is built for zoning. Each wireless radiator controller can be its own zone, and the system handles up to 12 zones with up to six time changes per day in each. It suits larger houses, extensions and homes where rooms are used at very different times. It is less of a gadget and more of a heating control system, and it rewards careful setting up.

Your boiler manufacturer’s own control

If you have a recent Vaillant, the sensoROOM smart thermostat with the myVAILLANT app and internet gateway is worth a look. It can use weather compensation, which adjusts the boiler’s flow temperature to the outdoor temperature, and it links to Apple HomeKit through the myVAILLANT connect gateway. Ideal’s Halo Combi Wi-Fi is designed specifically for Ideal boilers, connects straight to your Wi-Fi with no extra gateway, supports geolocation and works with Alexa and Google Home. Manufacturer controls tend to unlock more of the boiler’s efficiency features than a third-party thermostat can.

A note on Google Nest

Google has said it will not launch new Nest thermostats in Europe. The third generation Nest Learning Thermostat and Nest Thermostat E are still sold while stocks last and continue to receive security updates, but older first and second generation models stopped working in the Nest and Google Home apps from 25 October 2025. If you are buying new, we would choose one of the options above.

How to choose the right one for your home

Work through these in order and the choice usually makes itself.

1. Find out what boiler you have. A combi heats water on demand. A system or regular boiler has a hot water cylinder, usually in the airing cupboard, and needs a thermostat that controls hot water too.
2. Check for OpenTherm. Many modern boilers support it. It lets the thermostat modulate the boiler rather than switching it on and off. Your boiler manual will say.
3. Decide whether you want zoning. If some rooms are always too hot and others too cold, smart radiator valves will do more for comfort than any single thermostat.
4. Look at the subscription. Decide which features you would actually use and whether they need a paid subscription.
5. Check your Wi-Fi at the thermostat. A weak signal in the hallway causes more smart heating complaints than anything else.
6. Think about where the thermostat goes. It should be on an inside wall in a room you use, away from radiators, sunny windows and draughty doors.

If your radiators are not heating evenly, fix that first. A smart thermostat cannot make a cold radiator warm. See our guides on radiators not heating up and how to bleed a radiator.

The rules on thermostats and new boilers

In England, since April 2018, the Boiler Plus standard means every new gas boiler must be fitted with a timer or programmer and a room thermostat. A new combi boiler must also have at least one extra energy saving measure: load compensation, weather compensation, a smart thermostat with automation and optimisation, or a flue gas heat recovery device. That is why many new boiler installations now include a smart or compensating control as standard. If you are replacing your boiler, it is worth choosing the control at the same time, and our boiler installation team will talk you through the options.

Mistakes we see after DIY installs

• Fitting a heating-only thermostat to a system with a cylinder, so the hot water stops being controlled.
• Wiring a wireless receiver to the wrong terminals, so the boiler runs all the time or never comes on.
• Putting the thermostat next to a radiator or in a cold hallway, so the rest of the house is too hot or too cold.
• Setting smart radiator valves and the main thermostat to fight each other.
• Leaving an old mechanical room thermostat in circuit, so the new one only works when the old one also calls for heat.

How we price it

We tell you the price before we start, and there are no surprises on the day. In normal working hours there is no call-out fee, and our standard rates are published on our prices page, so you know what you will pay before we arrive. If you are replacing your boiler at the same time, installations are quoted as a fixed price after a free survey, so the price you agree is the price you pay.

Frequently asked questions

Do smart thermostats work with all boilers?

Most modern gas boilers work with a smart thermostat, but not every thermostat suits every system. Check whether you have a combi or a cylinder system and whether your boiler supports OpenTherm before you buy.

Can I fit a smart thermostat myself?

Some wireless kits are designed for DIY, but the receiver still has to be wired into the boiler or wiring centre at mains voltage. If you are not confident with electrics, have a qualified engineer fit it so the boiler and hot water are controlled correctly.

Do smart thermostats really save money?

They save energy mainly by not heating an empty house and by helping you turn the temperature down a little. The Energy Saving Trust suggests most homes are comfortable between 18 and 21 degrees, and each degree lower cuts heating use.

Do I need smart radiator valves as well?

Not always. A single smart thermostat controls the whole house to one temperature. Smart radiator valves add room-by-room control, which helps in homes where some rooms are rarely used or run hotter than others.

Do smart thermostats need a subscription?

The core app control on tado, Hive, Wiser, evohome and the Vaillant and Ideal controls is free. tado and Hive both offer optional paid subscriptions that add extra automation and reports.

Smart heating help in Hertfordshire, Bedfordshire and Cambridgeshire

If you want a smart thermostat that is compatible with your boiler, wired correctly and set up so it genuinely saves energy, our engineers can help. See our smart thermostat installation page or call 01462 506374. The phone is answered 24 hours a day, 7 days a week.