BBy Bikram Nath·Researched from UK Amazon listings·Updated 2026-10-16·6 products compared
Disclosure: As an Amazon Associate I earn from qualifying purchases. This guide contains Amazon affiliate links, and we may earn a commission — at no extra cost to you — but it never changes our rankings.
What are the best smart thermostats to buy in the UK?
Our top pick for Smart Thermostats in the UK is the Refoss Smart Thermostat for Combi Boiler and Water Underfloor Heating.
The Refoss smart thermostat suits combi boiler and water underfloor heating homes that want the listing's no-hub WiFi, Apple Home support, 5–35°C range and 2 years warranty.
The Refoss smart thermostat is our top pick because its listing states it works with combi boilers and water underfloor heating, connects on 2.4GHz WiFi with no hub and no paid subscription, holds a 5–35°C range with 0.1°C control, detects open windows and carries a 2 years warranty. For a conventional boiler with hot water, the Hive Smart Thermostat for Conventional Boilers lists heating and hot water schedules and an included Nano 3 Hub; for electric underfloor heating, the Meross MTS205 lists air and floor sensors.
This guide compares six smart thermostats from Refoss, tado, Hive, Meross and MOES, using what each listing states: heating system, app and voice control, schedules, temperature range, hub needs and warranty. Stated daily schedule slots run from six (Hive and MOES) to eight (Refoss and Meross).
Buying guide
What should you look for in Smart Thermostats?
1Heating system: the Refoss lists combi boilers and water underfloor heating and says it is not suitable for boilers that require digital protocols; the Hive combi model lists combi boilers, heating only; the Hive conventional model lists heating and hot water control; the tado° Starter Kit lists a programmer with hot water control; the Meross MTS205 lists electric underfloor heating only; the MOES lists water floor heating and gas boiler heating.
2Hub: the Refoss, Meross MTS205 and MOES listings say no hub is required; both Hive listings include a Hive Nano 3 Hub. The tado° Starter Kit listing does not state its hub arrangement in the features we read.
3Schedules: the Refoss lists up to 8 events per day and the Meross up to 8 heating periods per day; both Hive listings list up to six daily time slots; the MOES lists a 5+1+1 days weekly schedule of 6 stages daily; the tado° lists Smart Schedules for each room.
4Temperature range: the Refoss and Meross MTS205 both list 5–35°C, with 0.1°C control on the Refoss and ±0.5°C accuracy on the Meross. The Hive, tado° and MOES listings do not state a set-point range in the features we read.
5Warranty: the listings state 2 years (Refoss, tado° and Meross) and 1 year (both Hive models). The MOES listing states no warranty term.
Our process
How do we choose our picks?
We don’t lab-test products ourselves. Instead we synthesise current Amazon UK listings and published specs into clear, honest recommendations. We earn a commission if you buy through our links, but that never changes which products we rank.
Current UK availability
We check each pick against live Amazon UK catalogue data rather than last year’s model lists. Stock moves fast, so a listing can sell out after we publish.
Published specs
We compare manufacturer specifications so each pick is right for a real budget and use-case.
UK-specific fit
We factor in UK voltage and plug/fitting standards — details that generic global lists miss.
Combi boilers and water underfloor heating; most gas, oil and electric boilers; not…
Conventional boilers; heating and hot water control
Electric underfloor heating only (not water-based)
Combi boilers; heating only; OpenTherm compatible
Heating with hot water control (programmer included)
Water floor heating; gas boiler heating (5A)
Control
Refoss app, Apple Home, Alexa, Google Home
Hive app and voice commands with compatible smart assistants
Meross app, Alexa, Google Home; family sharing
Thermostat, Hive app and voice
tado° app; Alexa, Siri and Google Assistant
Tuya or Smart Life app; Alexa and Google Home
Schedule
Up to 8 events per day
Up to 6 daily time slots for heating and hot water
Up to 8 heating periods per day
Up to six daily time slots, seven days a week
Smart Schedules for each room
5+1+1 days weekly schedule of 6 stages daily
Hub
No hub required; 2.4GHz WiFi
Hive Nano 3 Hub included
No hub required; 2.4GHz WiFi
Hive Nano 3 Hub included
—
No hub required
Warranty
2 years
1-year manufacturer's
2 year manufacturer
1 year manufacturer's
2 year manufacturer
—
The rankings
The best Smart Thermostats, ranked
1
Refoss
Top Pick
Refoss Smart Thermostat for Combi Boiler and Water Underfloor Heating
The Refoss smart thermostat suits combi boiler and water underfloor heating homes that want the listing's no-hub WiFi, Apple Home support, 5–35°C range and 2 years warranty.
Heating System
Combi boilers and water underfloor heating; most gas, oil and electric boilers; not boilers that require digital protocols
Control
Refoss app, Apple Home, Alexa, Google Home
Schedule
Up to 8 events per day
Temperature Range
5–35°C, 0.1°C control
Hub
No hub required; 2.4GHz WiFi
Warranty
2 years
What we like
+Works with Apple HomeKit, Alexa and Google Home with no hub and no paid subscription, per the listing
+Open window detection turns heating off for 30 minutes
+Built-in air sensor plus an external sensor for underfloor heating systems
+2 years warranty stated
Worth noting
–The listing says it is not suitable for boilers that require digital protocols
–The listing does not mention hot water control in the features we read
£44.72£53.85−17%Amazon.co.uk price as of 03 Nov, 18:00 (London time). Details
Hive Smart Thermostat for Conventional Boilers with Hive Nano 3 Hub
The Hive Smart Thermostat for Conventional Boilers suits homes with a conventional boiler that want the listing's heating and hot water schedules, boost and an included Nano 3 Hub.
Heating System
Conventional boilers; heating and hot water control
Control
Hive app and voice commands with compatible smart assistants
Schedule
Up to 6 daily time slots for heating and hot water
Hub
Hive Nano 3 Hub included
Warranty
1-year manufacturer's
Boost
Heating and hot water boost for up to six hours
What we like
+Heating and hot water schedules with up to 6 daily time slots, per the listing
+Hive Nano 3 Hub included, connecting over Wi-Fi with no Ethernet cable required
+Holiday mode and automatic frost protection listed
+Geolocation heating alerts when you leave or return home
Worth noting
–The warranty stated is 1 year
–The listing does not state a temperature range in the features we read
£164.00£189.00−13%Amazon.co.uk price as of 03 Nov, 18:00 (London time). Details
Meross MTS205 WiFi Smart Room Thermostat for Electric Underfloor Heating
The Meross MTS205 suits electric underfloor heating in bathrooms and living rooms, with the listing's air and floor sensors, up to 8 heating periods per day and 2 year warranty.
Heating System
Electric underfloor heating only (not water-based)
Control
Meross app, Alexa, Google Home; family sharing
Schedule
Up to 8 heating periods per day
Temperature Range
5–35°C, ±0.5°C accuracy
Hub
No hub required; 2.4GHz WiFi
Warranty
2 year manufacturer
What we like
+Air and floor sensors with ±0.5°C accuracy and a 5–35°C range, per the listing
+Open window detection and daily and weekly energy use tracking in the app
+Child lock and glass touch panel listed
+2 year manufacturer warranty stated
Worth noting
–For electric underfloor heating only; the listing says it is not for water-based systems
–The listing says it needs a standard 86mm or 67mm box and live and neutral wires
£49.99Amazon.co.uk price as of 03 Nov, 18:00 (London time). Details
Hive Smart Thermostat for Combi Boiler Heating Systems with Hive Nano 3 Hub
The Hive Smart Thermostat for Combi Boilers suits combi boiler homes that want the listing's OpenTherm support, six daily time slots and an included Nano 3 Hub.
Heating System
Combi boilers; heating only; OpenTherm compatible
Control
Thermostat, Hive app and voice
Schedule
Up to six daily time slots, seven days a week
Hub
Hive Nano 3 Hub included
Warranty
1 year manufacturer's
What we like
+OpenTherm compatible, per the title and listing
+Hive Nano 3 Hub included with Wi-Fi connectivity
+Automatic frost protection if the home drops below 7°C
+Geolocation reminder to turn off the heating if you leave home when the heating is due to come on
Worth noting
–Heating only; the listing says it is not compatible with conventional boilers needing separate heating and hot water control
–The warranty stated is 1 year
–The listing does not state a temperature range in the features we read
£150.71£164.99−9%Amazon.co.uk price as of 03 Nov, 18:00 (London time). Details
tado° Starter Kit Wireless Smart Thermostat V3+ with Hot Water Control
The tado° Starter Kit V3+ suits homes that want a wireless thermostat with listed hot water control, per-room Smart Schedules and Alexa, Siri and Google Assistant support.
Heating System
Heating with hot water control (programmer included)
Control
tado° app; Alexa, Siri and Google Assistant
Schedule
Smart Schedules for each room
Warranty
2 year manufacturer
What we like
+Wireless thermostat and programmer with hot water control, per the title
+Heating Boost warms all rooms for 30 minutes with one click in the app
+Push notification reminder when no one is home or an open window is detected
+2 year manufacturer warranty stated
Worth noting
–Automatic turn-down (Auto Assist) is an optional paid in-app subscription, per the listing
–The listing does not state boiler compatibility or a temperature range in the features we read
£57.48Amazon.co.uk price as of 03 Nov, 18:00 (London time). Details
MOES WiFi Thermostat for Water Gas Boiler Heating White
The MOES WiFi Thermostat suits water floor heating or gas boiler homes using the Tuya or Smart Life app, with the listing's 6-stage daily schedule and no hub required.
Heating System
Water floor heating; gas boiler heating (5A)
Control
Tuya or Smart Life app; Alexa and Google Home
Schedule
5+1+1 days weekly schedule of 6 stages daily
Hub
No hub required
What we like
+Fits standard 86mm square cassettes and 60mm European cassettes, per the listing
+Monitors indoor temperature and humidity, per the listing
+Power-off protection to keep settings
+Hidden touch button and LED screen display
Worth noting
–The listing states no warranty term
–The listing does not state a temperature range in the features we read
£41.99Amazon.co.uk price as of 03 Nov, 18:00 (London time). Details
Product prices and availability are accurate as of 03 Nov, 18:00 (London time) and are subject to change. Any price and availability information displayed on Amazon.co.uk at the time of purchase will apply to the purchase of this product.
Editor's Note
These listings state compatibility by heating type, so the first check is your system: combi boiler, conventional boiler with hot water, or water or electric underfloor heating. The tado° listing names an optional paid Auto Assist feature, while the Refoss listing says it needs no paid subscription; the MOES listing states no warranty term.
Our Take
The Refoss is the default pick for combi boilers and water underfloor heating, with the listing's no-hub WiFi, 5–35°C range, open window detection and 2 years warranty. Choose the Hive Smart Thermostat for Conventional Boilers if you need listed heating and hot water control, or the Meross MTS205 for electric underfloor heating with listed air and floor sensors.
Questions & answers
Frequently asked questions
What is the best smart thermostat in the UK?
The Refoss smart thermostat is our top pick. Its listing states it works with combi boilers and water underfloor heating, needs no hub or paid subscription, holds a 5–35°C range with 0.1°C control and has a 2 years warranty.
Which smart thermostats control hot water?
The Hive Smart Thermostat for Conventional Boilers lists heating and hot water schedules and a hot water boost for up to six hours. The tado° Starter Kit lists a programmer with hot water control, while the Hive combi model says it controls heating only.
Do smart thermostats need a hub?
The Refoss and Meross MTS205 listings say no hub is required and state 2.4GHz WiFi, and the MOES listing says no hub is required for its Tuya or Smart Life app. Both Hive thermostats come with a Hive Nano 3 Hub, per their listings.
Which smart thermostat is for electric underfloor heating?
The Meross MTS205 is designed for electric underfloor heating only, per its listing, with air and floor sensors, ±0.5°C accuracy and a 5–35°C range. Its listing says it needs a standard 86mm or 67mm box and live and neutral wires.
Which smart thermostats can be controlled with an app and voice?
The Refoss lists the Refoss app, Apple Home, Alexa and Google Home. The Hive models list the Hive app and voice, the tado° lists its app with Alexa, Siri and Google Assistant, and the MOES lists the Tuya or Smart Life app with Alexa and Google Home.
Which smart thermostats detect open windows?
The Refoss listing says it turns off heating for 30 minutes when a window is opened, and the Meross MTS205 listing says it stops heating for a while. The tado° listing says its app reminds you to turn down the heating when an open window has been detected.
Affiliate disclosure: As an Amazon Associate I earn from qualifying purchases. UKPicks earns a small commission from qualifying purchases made via links on this page. This does not affect our editorial recommendations or the price you pay.
