SMART THERMOSTATS / EDITORIAL GUIDE

Smart Thermostats for UK Boilers: 5 Models Compared

Choosing a smart thermostat for a UK boiler starts with the heating system, not the app. The important differences are relay switching, OpenTherm or manufacturer-specific control, plus whether you need hot-water control or multiple heating zones.

Published 14 September 2026

Quick comparison

#ModelBest forListed priceMerchantOffer
1tado X Wireless Smart Thermostat Starter Kit with Hot Water Control and OpenTherm (VX-WTS02-WRP02-TC-UK-00)Most UK households balancing broad boiler compatibility with hot-water control.GBP 139.99ScrewfixView at ScrewfixMerchant link
2Hive V4 Wireless Heating OpenTherm Smart Thermostat (852108)Combi boilers where OpenTherm and a familiar UK platform matter.GBP 165.00AmazonView at AmazonAffiliate link
3Honeywell Home T6R-HW Smart Programmable Thermostat (Y6H920RW4026)Homes with a hot-water cylinder and S, Y or W plan controls.GBP 156.00PlumbNationView at PlumbNationMerchant link
4Worcester Bosch EasyControl CT200 (7 736 701 341)Worcester Bosch boiler owners wanting manufacturer integration.GBP 170.00ScrewfixView at ScrewfixMerchant link
5Honeywell Home evohome Connected Thermostat Pack (ATP921R3100)Larger homes planning serious multi-zone radiator control.GBP 229.98AmazonView at AmazonAffiliate link

Select a model for the full recommendation, or use View at merchant to open the selected offer directly. Prices and availability can change.

How to choose

Identify your heating layout before buying. Combi boilers normally need one heating channel, while a system or conventional boiler with a cylinder may need a separate hot-water channel. Check the exact boiler and wiring with a competent installer before changing controls.

Compare the details

Specifications and requirements from the sources below. Manufacturer claims are not independent test results.
ModelBoiler and control compatibilityInstallation and wiringHeating zones and hot waterApp controls and schedulesRequired accessories / ongoing costs
tado X Wireless Smart Thermostat Starter Kit with Hot Water Control and OpenThermCompatible with most gas boilers and heat pumps using relay or OpenTherm control.[1]A wired 230V Programmer pairs with a wireless battery room sensor.[1]The Programmer supports stored hot-water scheduling; extra radiator thermostats add room control.[1]The free app provides remote control and schedules.[1]No separate Bridge X is needed; radiator thermostats and AI Assist are optional.[1]
Hive V4 Wireless Heating OpenTherm Smart ThermostatSpecified for compatible combi boilers with OpenTherm or relay control.[2]Wireless thermostat with supplied receiver and Hub.[2]Heating-only kit; no separate stored-hot-water channel.[2]Core app controls include schedules, boost and holiday mode.[2]Hive+ is optional for premium features.[2]
Honeywell Home T6R-HW Smart Programmable ThermostatSupports 24-230V on/off and OpenTherm appliances.[3]Wireless thermostat with a boiler-side receiver and Wi-Fi app access.[3]Designed for central heating and stored hot water on S, Y and W plan systems.[3]App control, geofencing and flexible schedules are supported.[3]No separate internet gateway is identified for this Wi-Fi model.[3]
Worcester Bosch EasyControl CT200Connects directly to compatible Worcester Bosch boilers; other brands need an adapter.[4]A wall-mounted two-wire controller needs no separate hub.[4]Supports heating and hot-water programming and Bosch smart-radiator zoning.[4]The EasyControl app provides schedules and presence detection.[4]The app has no subscription; adapters and smart radiator valves are extra.[4]
Honeywell Home evohome Connected Thermostat PackSupports 24-230V on/off and OpenTherm-capable systems with suitable hardware.[5]Wireless controller plus wired boiler-side relay box.[5]Expandable to 12 temperature zones; hot-water control is possible.[5]Touchscreen and Total Connect Comfort app provide schedules and remote control.[5]Additional zone controllers and optional bridge or hot-water hardware may be needed.[5]

Our picks

1

tado X Wireless Smart Thermostat Starter Kit with Hot Water Control and OpenTherm (VX-WTS02-WRP02-TC-UK-00)

Most UK households balancing broad boiler compatibility with hot-water control.

Choose it for one kit that can cover compatible relay or OpenTherm boilers and stored hot water.

Before you choose: Room zoning needs extra tado X radiator thermostats; advanced AI Assist features are optional paid extras.

More details

Supports relay and OpenTherm control, with a wireless room sensor and stored-hot-water scheduling.

GBP 139.99Checked 14 Sep 2026
View at ScrewfixMerchant link
2

Hive V4 Wireless Heating OpenTherm Smart Thermostat (852108)

Combi boilers where OpenTherm and a familiar UK platform matter.

Choose it for a compatible combi boiler when a straightforward Hive setup matters more than a hot-water channel.

Before you choose: This exact kit is heating-only; OpenTherm is limited to one heating zone.

More details

A wireless Hive V4 combi-boiler kit supplied with receiver and hub.

GBP 165.00Checked 14 Sep 2026
View at AmazonAffiliate link
3

Honeywell Home T6R-HW Smart Programmable Thermostat (Y6H920RW4026)

Homes with a hot-water cylinder and S, Y or W plan controls.

Choose it when a separate hot-water cylinder is central to the installation.

Before you choose: It is a whole-system thermostat rather than an extensive smart-radiator zoning platform.

More details

The T6R-HW combines a wireless table thermostat with heating and stored-hot-water control.

GBP 156.00Checked 14 Sep 2026
View at PlumbNationMerchant link
4

Worcester Bosch EasyControl CT200 (7 736 701 341)

Worcester Bosch boiler owners wanting manufacturer integration.

Choose it when you have a compatible Worcester Bosch boiler and want the manufacturer controller.

Before you choose: Other boiler brands need an adapter; room zoning needs extra Bosch smart radiator valves.

More details

EasyControl is designed for compatible Worcester Bosch boilers and can programme heating and hot water.

GBP 170.00Checked 14 Sep 2026
View at ScrewfixMerchant link
5

Honeywell Home evohome Connected Thermostat Pack (ATP921R3100)

Larger homes planning serious multi-zone radiator control.

Choose it when independent room temperatures matter more than a simple single-thermostat replacement.

Before you choose: The starter pack is only the foundation: room zones, OpenTherm and hot-water control can need extra hardware.

More details

evohome is a zoning system: this starter pack includes the controller, stand and wireless relay box.

GBP 229.98Checked 14 Sep 2026
View at AmazonAffiliate link

How we assess products

Rankings are based on current manufacturer specifications, support documentation and exact UK product listings, with no hands-on testing claimed. Compatibility, installation requirements, heating and hot-water zoning, app features and required extras carry more weight than price.

Last editorial review: 14 September 2026.

Sources and product information

  1. tado: Wireless Smart Thermostat X Starter Kit
  2. Hive: Thermostat compatibility and OpenTherm information
  3. Resideo: Y6H920RW4026 T6R-HW specifications
  4. Worcester Bosch: EasyControl compatibility and zoning
  5. Resideo: ATP921R3100 evohome specifications

Frequently asked questions

Will a smart thermostat work with my UK combi boiler?

Many will, but check whether the boiler uses relay switching, OpenTherm or a manufacturer-specific control interface.

Do I need a professional installer?

A boiler receiver or programmer often connects to heating controls, so professional installation is sensible when wiring changes are required.

Can one smart thermostat control heating and a hot-water cylinder?

Only if its receiver supports a separate stored-hot-water channel. Check the exact product and heating layout.

Do smart thermostats require a subscription?

Core control and schedules are often included, but some advanced automation features are optional paid extras.