The Best Smart Thermostat 2021

A smart thermostat is the best way to control your home’s energy usage via smartphones, tablets and other smart devices. Within this article, we list some of the best that are easy to use, work with all smart devices and are suitable for all budgets.

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Best Smart Thermostat UK
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The use of smart technology within UK homes is becoming increasingly more popular with a smart thermostat being a great example. They provide added convenience and make it far easier for you to become more energy efficient.

Apart from being able to adjust the temperature, there are also many other smart features. Some of the extras include daily scheduling, automatic frost protection, holiday modes, integration with other smart devices and so much more.

If you require a quick answer, the best smart thermostat is the Hive Active Heating Kit, which includes multiple automatic energy saving modes and a stylish design. However, if you are willing to invest slightly more, the new and improved Google Nest is a great option that can control up to 20 thermostats.

In order to rate the smart thermostats, we based our recommendations upon our experience, plenty of research and a number of factors. The factors that we considered included the thermostat’s design, connectivity, modes, scheduling, ease of setup, compatibility, additional functionality, warranty and value for money.

Smart Thermostat Comparison

Smart ThermostatType
Hive Active HeatingWall Mounted or Portable
Google Nest 3rd GenWall Mounted
Netatmo NTH01-EN-ECWall Mounted or Portable
Honeywell T6RWall Mounted
tado° Starter Kit V3Wall Mounted or Portable
Drayton Wiser Multi-ZoneWall Mounted or Portable
Warmup WU4IEWall Mounted

Although smart thermostats rely on a reliable internet connection and come with a premium price, they are a worthwhile investment. In the long run, the automatic modes and scheduling will help you be more efficient and save you money.

Below is a list of the best smart thermostats that are stylish and can be controlled via smartphone applications.

The Best Smart Thermostat

1. Hive Active Heating and Hot Water Thermostat

Hive Active Heating and Hot Water Thermostat
The Hive smart thermostat is by far one of the most attractive and user friendly options on the market. The thermostat also works seamlessly with the brand’s dedicated and award winning smartphone application. From the application you can set the heating to come on within six time slots during the day and easily set schedules for each day of the week.

In terms of the installation, you will need to use a hub and receiver if you haven’t already got one. However, once the hub has been setup, you can then begin to add other accessories such as smart plugs.

Other features of the Hive Active Heating and Hot Water include:

  • Set schedules for each day of the week
  • Six time slots per day
  • Heating boost for up to six hours
  • Automatic frost protection and “Holiday” mode
  • Intuitive and attractive thermostat
  • PIN lock that avoids tampering
  • Award winning smartphone and tablet application
  • Battery powered thermostat

Overall, it’s one of the best smart thermostats available in the UK that’s easy to setup and use with the brand’s excellent application. We have installed the Hive thermostat ourselves and use it for controlling both our underfloor heating and the radiators. We have zero complaints and it’s transformed the way we schedule the heating in our house.
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2. Nest Learning 3rd Gen Smart Thermostat

Nest Learning 3rd Gen Smart Thermostat
Just as popular as the Hive alternative is the 3rd generation Google Nest thermostat. It’s the most expensive within this article but offers further functionality and is also able to control up to 20 thermostats per home. Included with the complete package is the display, base, heat link, trim plate, mounting screws and the installation guide.

According to the brand, this smart thermostat is compatible with the majority of heating systems, which include gas, oil and condensing boilers as well as underfloor heating and heat pumps.

Other features of the Google Nest Third Gen include:

  • Remote control from anywhere on your mobile, tablet or laptop
  • Auto-scheduling and auto-away
  • Advanced modulation using OpenTherm technology
  • Compatible with the majority of heating appliances
  • Can be installed with ease
  • Geo-location and built-in sensors to avoid heating an empty home

If you can afford the additional upfront cost of the Google Nest, it’s an excellent smart thermostat that won’t disappoint. Compared to the previous generations, it’s far more superior with a slimmer and sleeker design and also a bigger display.
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3. Netatmo NTH01-EN-EC Smart Thermostat

Netatmo NTH01-EN-EC Smart Thermostat
The Netatmo NTH01-EN-EC is an affordable option that can be activated by voice commands or using the dedicated smartphone application. Depending upon your preference, you can mount it to a wall or keep it nearby using a stand.

A distinctive feature of the Netatmo smart thermostat is its unique design, which is simplistic and can be personalized using the included adhesive coloured strips. The complete kit also includes a stand, relay, adapters, mounting plates, USB cable and three AAA batteries

Other features of the Netatmo NTH01-EN-EC include:

  • Compatible with the Alexa, Google Assistant and Apple HomeKit
  • Brand states that it takes less than an hour to install
  • Absent and frost protection modes
  • Compatible with most types of boilers
  • Simplistic design with four coloured stripes

Although the design may not be as fancy as the premium alternatives above, it’s still stylish and practical. The brand also offer a wide range of other products that can also be controlled from the same application as the smart thermostat.
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4. Honeywell Home T6R Smart Thermostat

Honeywell Home T6R Smart Thermostat
Another affordable option is the Honeywell T6R model, which uses a simple touchscreen interface to control the heating. As with many of the alternatives, it also works with the Alexa, Apple HomeKit and Google Assistant.

The installation of this smart thermostat is also very straightforward. Simply download the application, follow the instructions on the screen and connect the receiver box with your router.

Other features of the Honeywell Home T6R include:

  • Easy to use touchscreen display
  • Location based temperature control
  • Dedicated application
  • Compatible with Alexa, Google Home and Apple HomeKit
  • Mains power supply

For those that like the Hive design but not the expensive price, this smart thermostat is the closest alternative. It combines an attractive design, value for money and a wide range of functionality into a single affordable package.
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5. tado° Smart Thermostat Starter Kit V3

tado° Smart Thermostat Starter Kit V3
The tado° brand produce a wide range of smart home appliances and this is their latest thermostat available. Unlike previous models, the third generation uses optimized algorithms to provide more savings along with seamless integration with other appliances. Included in the box is the thermostat, internet bridge, mounting hardware, installation guide and accessories.

Other features of the tado° Smart Thermostat include:

  • Compatible with 95% of heating systems
  • Uses the phones location and weather forecast to tailor the energy usage
  • Works with the Amazon Alexa, Apple HomeKit and Google Assistant
  • Multi-room control and smart scheduling
  • Open window detection
  • Box includes everything you require

The brand state that by using their smart thermostat, you can instantly cut your energy bill by up to 31%, which is a big claim. Overall, it’s an excellent all-round option that provides plenty of functionality and is relatively affordable too.
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6. Drayton Wiser Multi-Zone Smart Thermostat

Drayton Wiser Multi-Zone Smart Thermostat
Drayton produce a variety of kits that are suitable for controlling various heating appliances throughout your home. Their smart thermostat known as the Wiser model enables you to control all of the brand’s smart heating devices via the application and also have access to various smart modes.

However, one issue that we found with this smart thermostat is that the connectivity range is only between 25 to 40 feet, which may be an issue for large homes. Although there is an optional extender device available to increase the range, this does add to the overall cost of the complete system.

Other features of the Drayton Wiser Thermostat include:

  • Eco, away and comfort modes
  • Easily control radiator thermostats room-by-room
  • Controls up to 16 rooms, 32 radiators and 10 smart plugs
  • Integrates with Alexa, Google Assistant and IFTT
  • Fits to a standard UK back plate

Overall, the Drayton Wiser Smart Thermostat is a highly rated option that comes with many optional extras for maximum control of your heating. If you do decide to choose this thermostat, it’s important to note that there are specific kits designed for either a combination or conventional system.
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7. Warm-UP 4IE Smart WiFi Thermostat

Warm-UP 4IE Smart WiFi Thermostat
The Warm-UP smart thermostat is one of the cheapest on the market that still includes all the functionality you will require for controlling your home’s heating. It’s a programmable thermostat that’s designed for underfloor heating and comes with its very own smartphone application.

Other features of the Warm-UP Thermostat include:

  • Easy to use application for phone or tablet
  • Intuitive and clear display
  • Includes a three year guarantee
  • IP33 and insulation class 11 rated
  • Easily integrates with Google Home and Amazon Alexa

If you want a cheap smart thermostat for controlling your underfloor heating, the Warm-UP is an excellent option. It’s easy to setup and a great upgrade when compared to the previous 3IE model, which was also very popular.
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How We Rated The Smart Thermostats

Although we own the Hive system, we have also tried and tested many other smart thermostats, which includes the Google Nest, Tado, Honeywell, Drayton and many others.

As well as our own experience of using multiple smart thermostats, we also based our recommendations upon hours of research and a number of factors. The factors that we considered included the thermostat’s design, connectivity, modes, scheduling, ease of setup, compatibility, additional functionality, warranty and value for money.


Investing into a smart thermostat can be an expensive purchase but one that you won’t regret. It offers convenience and improves your energy efficiency, which in the long run will save you money.

All of our recommendations are suited to a range of budgets and include many different desirable features. To avoid disappointment, we highly advise that you ensure your Wi-Fi is fully functioning and reliable before purchasing a thermostat because they rely on a solid connection.

The Author Who Worked On This Article

author dan darimo

Dan Morgan

As a keen DIY’er, gardener and somebody that loves the latest tech, Dan is someone that brings years of experience in multiple trades. Since buying his first house, he has been obsessed with renovating properties and filling it with the latest products. This has led him down the road of testing hundreds of products and creating in-depth “how-to” and informative guides that offer his first-hand experience. Other interests include working on cars, keeping fit through sports or his home gym, caravanning and drinking great coffee.

If you would like to read more about Darimo and the authors, you can visit our about page. This goes into great detail regarding how we test products, create our guides and everything else.

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