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Best smart thermostats in the UK

By COMANORA· Updated 5 November 2026· What changedResearched

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Quick picks

How we assessed this:we compared 9 products available in the UK on the criteria below, using the manufacturers' own product pages. Prices were checked at official shops and UK retailers. Documentary research, not hands-on testing. Our method
9 of 9 match
#1 Widest compatibility
tado° Wireless Smart Thermostat X Starter Kit (with Hot Water Control and OpenTherm)Homes that may later add room-by-room control, including heat-pump homes.
Combi boilerHeat pumpOpenTherm
£139.99ScrewfixView
#2 No subscription (combi)
Wiser by Drayton 1 Channel Smart Room Thermostat Kit (2nd Generation)Combi-boiler owners who never want a subscription and may add radiator thermostats later.
Combi boilerHeat pump (check)OpenTherm
£178.99ScrewfixView
#3 Best for hot water cylinders
Wiser by Drayton 2 Channel Smart Room Thermostat Kit (2nd Generation)Homes with a hot water cylinder that want heating and hot water schedules with no subscription.
Combi boilerHeat pump (check)OpenTherm
£178.99ScrewfixView
#4 Lowest price with a Hive Hub
Hive Thermostat MiniCombi-boiler homes that want a low-cost smart thermostat.
Combi boilerHeat pumpOpenTherm
£79Hive shop£159 with required Hive HubView
#5 Replacing a wired thermostat
tado° Wired Smart Thermostat X (2nd gen)Replacing an existing wired room thermostat, including on heat pumps and underfloor heating.
Combi boilerHeat pumpOpenTherm
£109.99tado° shop£169.98 with required tado° Bridge XView
#6 OpenTherm boilers only
Netatmo Smart Modulating ThermostatOwners of an OpenTherm boiler who want modulating control and fault alerts.
Combi boiler (check)Heat pumpOpenTherm
£199.99Netatmo shopView
#7 Physical dial
Hive ThermostatCombi-boiler homes that want a physical dial.
Combi boilerHeat pumpOpenTherm
£119Hive shop£199 with required Hive HubView
#8 Simple on/off
Netatmo Smart ThermostatOn/off systems and air-to-water heat pumps where OpenTherm isn't needed.
Combi boilerHeat pumpOpenTherm
£159.99Sold out at Netatmo shop when checkedView
#9 Extra zone for Wiser
Wiser by Drayton Smart Room Thermostat (add-on)Existing Wiser systems that need another room thermostat.
Combi boilerHeat pump (check)OpenTherm
£105Wiser by Drayton shopView

1. tado° Wireless Smart Thermostat X Starter Kit (with Hot Water Control and OpenTherm) — widest compatibility

A flexible starter kit that controls relay or OpenTherm boilers and heat pumps, with hot water control built in. Core control is free; tado°'s AI Assist features cost extra.

Pros
  • Supports both relay and OpenTherm control
  • Listed as compatible with heat pumps as well as gas boilers
  • Includes hot water control
  • No separate bridge needed with this kit
Cons
  • Several advanced features (such as geofencing and Energy IQ) are part of the paid AI Assist
  • Not compatible with older tado° V3+ products
  • The Programmer must be wired to the boiler or heat pump

Full details, compatibility and prices →

2. Wiser by Drayton 1 Channel Smart Room Thermostat Kit (2nd Generation) — no subscription (combi)

A subscription-free combi-boiler kit with OpenTherm and a 3-year warranty, built to expand into multi-room control. It was sold out at Wiser's shop when we checked.

Pros
  • No subscription fee
  • 3-year warranty
  • Relay and OpenTherm
  • Large expansion capacity (16 rooms)
Cons
  • Highest listed price of the thermostats we checked
  • Not for system or regular boilers (choose the 2 Channel kit)
  • Heat pumps on/off control only
  • No Apple Home support listed

Full details, compatibility and prices →

3. Wiser by Drayton 2 Channel Smart Room Thermostat Kit (2nd Generation) — best for hot water cylinders

Wiser's subscription-free kit for system and conventional boilers with a hot water cylinder, with separate hot water control.

Pros
  • Separate hot water control
  • No subscription
  • 3-year warranty
Cons
  • Not for combi boilers (choose the 1 Channel kit)
  • OpenTherm not listed
  • No Apple Home support listed

Full details, compatibility and prices →

4. Hive Thermostat Mini — lowest price with a hive hub

The lowest-priced thermostat in our list if you already own a Hive Hub (£79); £159 with the hub. OpenTherm works on compatible combi boilers. Hive does not guarantee heat-pump compatibility.

Pros
  • £79 at Hive if you already have a Hive Hub
  • OpenTherm support on compatible combi boilers
  • Works with Apple HomeKit as well as Alexa and Google
Cons
  • Needs a Hive Hub (+£80 if you don't have one)
  • Heat pumps not guaranteed by Hive
  • OpenTherm is single-zone only
  • 1-year standard warranty unless you subscribe to Hive+
  • Some Worcester Bosch models listed as incompatible

Full details, compatibility and prices →

5. tado° Wired Smart Thermostat X (2nd gen) — replacing a wired thermostat

A slim wired thermostat that reuses existing room-thermostat wiring with relay or OpenTherm control. It needs a Thread border router such as tado° Bridge X.

Pros
  • Relay and OpenTherm
  • Rechargeable battery
  • Listed for boilers, heat pumps and wet underfloor heating
Cons
  • Needs Bridge X or another Thread Border Router
  • Not compatible with tado° V3+
  • Only replaces a wired thermostat

Full details, compatibility and prices →

6. Netatmo Smart Modulating Thermostat — opentherm boilers only

A thermostat only for OpenTherm boilers, with weather-adaptive heating and boiler fault alerts. It is not for relay-only boilers or heat pumps.

Pros
  • Full OpenTherm modulation
  • Boiler anomaly alerts
  • No subscription mentioned
Cons
  • OpenTherm boilers only
  • Hot water control limited to storage combis
  • Only Google voice control shown on the page

Full details, compatibility and prices →

7. Hive Thermostat — physical dial

Hive's original thermostat with a physical dial, for people who want on-wall controls as well as the app. Add £80 for the Hive Hub if you don't have one.

Pros
  • Physical dial and buttons
  • OpenTherm on compatible combi boilers
  • Apple HomeKit support
Cons
  • Needs a Hive Hub (+£80)
  • Heat pumps not guaranteed
  • Some features need Hive+

Full details, compatibility and prices →

8. Netatmo Smart Thermostat — simple on/off

A simple on/off smart thermostat that Netatmo lists for boilers and air-to-water heat pumps. It was out of stock at Netatmo UK when we checked.

Pros
  • Listed for air-to-water heat pumps
  • No subscription mentioned
  • Expandable with Netatmo radiator valves
Cons
  • Out of stock when checked
  • On/off control only
  • Only Google voice control shown on the page

Full details, compatibility and prices →

9. Wiser by Drayton Smart Room Thermostat (add-on) — extra zone for wiser

An extra wall thermostat for Wiser owners who want another zone; not a standalone product.

Pros
  • No subscription
  • Expands an existing Wiser system
Cons
  • Not standalone — needs a Wiser kit
  • Specifications on the listing are brief

Full details, compatibility and prices →

How we chose

CriterionWeight
Compatibility with common UK heating systems (combi, system, regular, heat pump)35%
Upfront cost including any required hub or bridge, plus required subscriptions25%
Boiler control quality (OpenTherm) and hot water control25%
Warranty and subscription-free functionality15%

Commission is not a criterion. Rankings are fixed before affiliate links are added.

What changed

  • 5 November 2026 — Added tado° Wired Smart Thermostat X (2nd gen), Wiser 2 Channel kit, Hive Thermostat and two Netatmo thermostats. Corrected Hive Thermostat Mini: a Hive Hub (+£80) is needed if you don't have one.
  • 5 November 2026 — Replaced example products with three UK thermostats researched from manufacturer pages.