Best smart thermostat 2020: stay warm and save money

The best smart thermostats and smart radiator valves from Nest, Hive, Tado and more

Best smart thermostat 2020

The nights are drawing in, it's getting cold outside, and the best smart thermostat could keep you toasty warm and save you money at the same time. If you're sitting in a house controlled by an old, dumb thermostat, you're doing it wrong: T3 is here to bring you our pick of the finest smart thermostats around - and we might even be able to save you a few shekels before your new device is even installed.

Everything we've included in this guide is the cream of the crop, and we've picked smart thermostats that should fit every budget and every potential use case. Whether it's the movable, attractive Nest Thermostat E or the clever DIY installation of the Tado Smart Thermostat, we've selected the absolute best smart systems around.

All of these give you options. They allow you to set the temperature from your phone or (often) your computer, they work out just how you like your house in order to save energy and automatically set things to be just right, and they'll usually combine perfectly with your other smart equipment to make your smart home whole. If you happen to go out (crazy notion, we know) your smart thermostat should even be able to work out you're not around, dropping the temperature so it's not wasting heat on an empty house.

We may have picked a best smart thermostat, such is the way with ranked guides like this. But we're well aware that our choice may not be the best smart thermostat for you. Picking the right one is going to be a personal choice, and we'll help you select the perfect option with a bit of handy advice; just weigh up your needs and the amount you're willing to pay, and you'll find the smart heating option that's right for you. 

How to buy the best smart thermostat for you

You don't have a host of specs to sift through when choosing the best smart heating thermostats for 2020 – they all work along similar lines – but compatibility with other smart home kit is one important consideration to weigh up. Make sure your new thermostat is going to work with your existing smart home devices.

In other words, if you're already controlling most of your smart home kit through Amazon Alexa, it makes sense to buy a smart thermostat that's also Alexa compatible, rather than suddenly switching to Google Assistant.

We'd also recommend checking with your energy company to see if any smart thermostat deals are on the table: it might discount the price of certain models, or maybe even give you one for free.

Apart from that, the right device for you will be one that adapts to your home's routine and starts saving you cash (by intelligently setting temperatures) as quickly as possible, and the associated app and platform can help here. 

You can even use smart thermostats to create zonal heating in your home – many of the device support existing zonal setups, but there are also options such as the Tado Smart Radiator Thermostat that enable you to control each radiator individually, so you colder rooms can get more heating time.

Without further ado, here are the best smart thermostats in the UK.

Black Friday deals on smart thermostats

Some of the best thermostat brands here will offer great Black Friday deals. Tado's products have featured in sales in the past, as has the Netatmo thermostat. It's certainly possible that Nest and Hive will pop up too – Google smart home products often appear in Black Friday sales particularly.

Our pick of the best smart thermostats

Nest Thermostat E Best smart thermostat 2020T3 Awards 2020

1. Nest Thermostat E

A brilliantly stylish, capable and affordable smart thermostat

Display: 81 mm x 81 mm, 320 x 320 pixel 24-bit colour LCD
Sensors: Temperature, humidity, near-field activity, far-field activity, ambient light
Connectivity: 802.11b/g/n Wi-Fi (2.4GHz/5GHz); 802.15.4 (2.4GHz); Bluetooth Low Energy (BLE)
Compatibility: Combi boilers; System and heat-only boilers; Domestic hot water tanks; Hydronic underfloor systems; Air-source and ground-source heat pumps (heating only); Zoned systems (one Nest Thermostat per zone); Heating systems with OpenTherm technology
Colours: white
Reasons to buy
+Smart Nest learning on board+Better value than the top-end Nest+Excellent mobile apps+Alexa and Google Assistant compatible

If we were to be uncharitable, we'd describe the Thermostat E as a bargain-basement version of the Nest Learning Thermostat. There have been some obvious corners cut: the screen is a little more muddy, the case more plasticy and obviously cheaper, and there's less usful info displayed. But every one of those features is a nice-to-have rather than a must-include, and on balance the Nest Thermostat E is the better deal, premium feel or not.

It's the brains that make a thermostat, not the presentation, and this is perfectly fine in isolation, and it has all the smarts you'll need. You can always go for its more expensive cousin if you really want to wow guests with your thermostat.

You get all the smarts that are well-established in the Nest line, most impressive of which is the learning algorithm which works out both when you're home and when you like the heat a little hotter, helping to set the right temperature at the right time. This should save you money, since you won't leave it turned up by accident. It'll also tie in to individual temperature sensors, so you can make sure you're getting the heat you want in the right rooms and spaces. 

Unsurprisingly, the Thermostat E plays nice with Google Assistant, but Alexa users will be glad to know it works happily with that ecosystem too. It's not, however, compatible with Apple's HomeKit platform, and you won't be able to control it with a SmartThings hub either.

Neatly, Nest will send you a smart energy report every month, to show you just how active the thermostat has been, and give you a chance to tweak its settings if it looks like it's got the learning a little wrong. In terms of bang for your buck, this is the best smart thermostat of 2020.

Tado Smart Thermostat Best smart thermostat 2020

2. Tado Smart Thermostat

Minimalist, efficient and easy to use

Display: 32x20mm LED matrix display, comprising 10x19 LEDs
Sensors: Temperature; Humidity; Ambient Light
Connectivity: 868MHz, Mesh (6LoWPAN)
Compatibility: Worcester, Baxi, Vaillant, Potterton, Ideal... ; Supports both 230V and extra low voltage interfaces (digital bus/analogue); Combi, system and heat-only boilers; Conventional and condensing boilers; Common Y-, S- and W-plan setups; Relay compatible, both switched live systems and potential free (dry contact) systems; Compatible with the UK standard backplate; Hydronic underfloor systems; Electric underfloor systems with a maximum switching current of 6A; Air source and ground source heat pumps (heating only); Zoned systems (one Smart Thermostat per zone)
Colours: White
Reasons to buy
+Easy to use thermostat and app+Geofencing capability+Works with 95% of central heating systems+Valves have a display too

Now on version three, Tado's thermostat is a refined little thing, and we have to say it's a  looker despite its more simplistic LCD display. It's hugely compatible, apparently happy to interact with some 95% of boilers on the market, and it works with just about everything: combi and conventional boilers, heated floors, hot water systems, the lot. Although we'd recommend you have a qualified engineer fit it, Tado suggests that the v3 can be installed by just about anyone within around an hour, so it's one to give a go if you're handy with a screwdriver.

It can work out the layout of your rooms and the heat capacity of your home, so if you're looking to hit a certain temperature at a certain time, it'll fire up your heat a little early to get to target temperature at the right time. There's also geofencing, so the Tado thermostat works in tandem with your phone to know when you're in range of home; after you've been out, it'll predict from your movements if you're on the way home and get things warming up in anticipation.

You can control it with the app (natch) which is a very good looking and well laid out thing, but there's also compatibility with all three major smart assistants. 

Tado isn't just the core thermostat, of course. Its capabilities can be extended with temperature sensors which you scatter around your home, and Tado's radiator thermostats complete the package by allowing you to control the specific temperature in each room by tweaking radiator valves automatically.

Nest Learning Thermostat Best smart thermostat 2020

3. Nest Learning Thermostat

Smart, easy-to-use, and surprisingly sexy

Display: 5.3cm, 480x480, 229ppi LCD
Sensors: Temperature, Humidity, Near-field activity, Far-field activity, Ambient light
Connectivity: 802.11b/g/n Wi-Fi (2.4GHz/5GHz); 802.15.4 (2.4GHz); Bluetooth Low Energy (BLE)
Compatibility: Combi boilers; System and heat-only boilers; Domestic hot water tanks; Hydronic underfloor systems; Air-source and ground-source heat pumps (heating only); Zoned systems (one Nest Thermostat per zone); Heating systems with OpenTherm technology
Colours: Stainless Steel; Copper; Black; White
Reasons to buy
+Third-generation model+Easy to use+Learns as you go+Can be controlled from your tablet or smartphone+Cost includes expert installation

Nest takes Apple-like care in its product design (it was founded by ex-Apple employees), and it's definitely one of the better-looking smart thermostats out there. In fact the Nest is largely responsible for kick-starting this whole smart home category.

This 3rd-generation Nest Learning Thermostat is able to monitor your habits and control the heating accordingly. So, for instance, if regularly go to bed at 11pm or so, the system learns from that and starts turning the system off around that time. Before long you're saving money and you don't even have to touch the Nest.

Another smart feature the Nest brings to the party is an on-board activity sensor that can take an educated guess as to whether anyone is at home or not, and then adjust the heating schedule accordingly. If you want to take more manual control, over when the heating starts and stops, then the Nest is easy to schedule using the accompanying app.

That circular glass interface is beautiful to behold and so incredibly simple use – all you require is an opposable thumb and a forefinger. While the Nest Learning Thermostat comes with everything you need to fit it, we'd say you're better off having an engineer do it, especially as the £279 price includes installation.

With the Nest Thermostat E delivering essentially the same performance and functionality but for a much cheaper price point, potential buyers should evaluate just how much they desire the more premium aesthetic, though. Still hands down one of the best smart thermostats right now.

Hive Heating Control Best smart thermostat 2020

4. Hive Heating Control

Smart, stylish and expandable, this is one of the best smart thermostats on the market

Display: 100 mm x 104 mm
Sensors: Temperature
Connectivity: Wi-Fi, Zigbee
Compatibility: Most gas, LPG, oil and electric boilers
Colours: 12+ frames sold separately
Reasons to buy
+App and thermostat are easy to use+Modern, minimalist design+Extensible with Hive smart home products+You don't have to be a British Gas customer to buy it

Hive is developed by British Gas, but you don't have to be a British Gas customer to use it. This excellent system is fitted by a qualified engineer, and includes a boiler receiver, an internet router hub, and a wall-mounted thermostat — which may not be quite as handsome as the Nest, but which is still easy on the eye. It's undoubtedly one of the best smart thermostats out there.

Perhaps more importantly, the whole system is ridiculously easy to use, whether you're operating the console itself or using the accompanying apps for iOS or Android. You can change the temperature or thermostat schedule from anywhere, automatically set the heating to turn off when you leave the house, then have it automatically turn back on again when you come home.

This works via location tracking in the app and it's the same for all the members of the household, if they're all happy installing the app – it means the rest of your family won't suddenly be plunged into freezing temperatures just because you've popped to the shops, which is obviously something you want to avoid.

The system is expandable too. Hive has released a range of compatible products, including sensors and plugs, so all your devices will talk to each other – you have the option of paying outright or via subscription, which gives you ongoing user support too. As an added bonus, you get support for Amazon Alexa and Google Assistant with Hive too, so it really earns its place on our list of the best smart thermostats of 2020.

Drayton Wiser Thermostat best smart thermostats 2020

5. Drayton Wiser Thermostat

One of the best smart thermostats for value for money

Compatibility: Conventional boiler systems with separate water tanks
Colours: White
Reasons to buy
+Separate room control+Choice of packages

Without packing in too many extra bells and whistles, the Drayton Wiser Thermostat system offers one of the best smart thermostat options in 2020: intelligent control of temperatures from your phone, and separate radiator valves.

That means you can customise the heating in each room if you need to, and the app gives you a choice of preset modes to pick from if you don't want to spend too long configuring everything. Amazon Alexa and Google Assistant support is included here as well.

While it doesn't have the same kind of brand recognition as something like a Nest or a Tado, the Wiser systems do a lot of the same jobs for a very appealing price, and are definitely worth considering.

We especially like the way you can start off small with radiator thermostats, and then add more as needed: you get a level of control and fine-tuning that not all the devices on this list can match.

There are small things that hint at where the experience isn't quite as slick as the likes of Nest of Tado – for example, geofencing is done through IFTTT, rather than directly, making it more complicated to set up – but for those who want the both smart features and multi-zonal control for a lower price, it's a really strong option.

Ecobee4 Best smart thermostat 2020

6. Ecobee4

Comprehensive smart home heating

Display: 109 mm x 109 mm
Sensors: Temperature, humidity
Connectivity: Wi-Fi
Compatibility: Gas, electric, oil, dual fuel
Colours: Black
Reasons to buy
+Support for up to 32 sensors+Simple and easy to use+Alexa, Google Assistant, HomeKit compatible

You can cover a lot of bases with the Ecobee4. It works with both Amazon Alexa and Google Assistant for a start, if you want to bark out your smart heating instructions to the nearest speaker, and it's compatible with Apple HomeKit and a variety of other third-party sensors too. It's going to fit in with most smart home setups, and it's well worth an entry on our list of the best smart thermostats in the UK.

The Ecobee4 is also capable of measuring the temperature at multiple different points around your home — you only get one sensor with the unit, but you can add up to 32 more if you live in an extensive stately home. That said, it doesn't have the intelligent learning built into the Nest, so you need to take more manual control over your thermostat.

As you would expect from a smart thermostat, everything can be controlled from the accompanying apps for Android or iOS, so you can sort out your heating while you're away from home (or tell your thermostat you're on holiday). Don't forget that built-in Alexa functionality gives you access to thousands of skills that go way beyond smart heating as well – from checking up on the weather to ordering a taxi.

It works with a bunch of other smart home stuff (including Samsung SmartThings), it's easy to configure and operate, and with support for so many sensors, it can keep an eye on your whole house. The Ecobee4 is hard to beat in the best smart heating thermostats battle.

Netatmo Smart Thermostat Best smart thermostat 2020

(Image credit: Netatmo)

7. Netatmo Smart Thermostat

Affordable smart thermostat with a few limitations

Display: E-Paper display
Sensors: Temperature
Connectivity: 802.11b/g/n Wi-Fi (2.4GHz)
Compatibility: Gas, oil, wood boilers and heat pumps (replaces existing wired and wireless thermostats)
Colours: Interchangeable, using 4 colour adhesives (supplied)
Reasons to buy
+Easy to use thermostat and app+Energy saving+Relatively affordable+Wireless operation
Reasons to avoid
-Old-fashioned E-Ink display-Design is nothing special-Fewer features than the Nest

Netatmo, the French company that revolutionised the home weather station, has employed the services of product designer and Frenchman Philippe Starck to create its take on the humble thermostat.

And here it is, a translucent plexiglass cube with a simple display. Given that it's designed by one of Europe's foremost creatives, the old-fashioned black e-Ink display and white casing feels a bit ordinary, especially alongside something like the Nest. But hey, looks aren't everything — Netatmo predicts its thermostat will save the average user about 37% in energy costs, so that's a definite bonus.

Again, everything here is controlled via the free Android and iOS apps and setup is a doddle. On initial installation, it'll ask you five simple questions and then create a schedule based on your lifestyle. Another very cool feature is that the thermostat itself can be installed in two ways: as a wired replacement for your current unit or wirelessly, using three AAA batteries.

The wireless option allows you to place the thermostat in any room which is handy if you use one room more than the other. If you still need convincing that this is one of the best smart thermostats out there, the Netatmo is also one of the cheaper options you can pick up (though it's not as well equipped as some of its rivals), and it works with EDF Energy's HeatSmart (available for £199 including installation).

Honeywell Lyric T6/T6R Best smart thermostat 2020

(Image credit: Honeywell)

8. Honeywell Lyric T6/T6R

Easy-to-use smart thermostat – with limitations

Display: not stated
Sensors: Temperature
Connectivity: Wi-Fi
Compatibility: Heating systems with OpenTherm technology; Common Y- and S-plan setups
Colours: not stated
Reasons to buy
+Easy to use+Geofencing works well+Apple HomeKit and Amazon Alexa compatible
Reasons to avoid
-Needs professional installation-Limited programming options

Looking like a cross between the British Gas Hive and the Nest from Google, the Lyric T6 is the latest in a long line of smart connected devices from the highly-regarded Honeywell with wired (T6) and wireless table-top (T6R) versions available.

The Honeywell Lyric T6/T6R can be controlled either via its touchscreen or via the free Honeywell Lyric smartphone app, with built-in geofencing so the system automatically knows to switch on and off depending on how close you (or other members of your household) are to home. It also works with Amazon's Alexa and is Apple HomeKit ready.

As with other smart thermostats, the Honeywell Lyric T6 is best fitted by a professional installer, since the supplied box that connects to your boiler (or second zone) needs to be connected to the mains. Once installed and set up, however, the system is easy to use — although there are some limitations.

While you can use either geolocation or a range of programmable modes to configure the heating, you can't use both these options together – a shortcoming the Tado, for example, doesn't have. That said, we do like is the Lyric's Optimised Start mode, which automatically fires up the heating early so your home is already add the right temperature when you wake up — just the job for those cold winter mornings.

Honeywell Evohome best smart thermostat 2020

9. Honeywell Evohome

One of the best and most comprehensive smart thermostat systems around

Display: not stated
Sensors: Temperature
Connectivity: Wi-Fi
Compatibility: Gas, fuel, wood and electric boilers, heat-pump, zone valve, radiators, underfloor heating
Colours: White
Reasons to buy
+Learns as it goes+Supports a wide range of heating systems+IFTTT and Alexa integration

Want to see another Honeywell system in our best smart thermostats list? Oh, go on then – the Honeywell Home is older and simpler than the newer Lyric models, but where it really excels is in the zonal control it offers.

You get individual thermostats for each radiator in the home, and a TRV valve is required in each case. Setup is easy on the radiator side though a little complicated when it comes to hooking up the boiler — it's best getting a professional in to do the job.

Design-wise, it's not going to win any awards, but it does the job of giving you more control over how and when your home gets heated. Each thermostat can be on a separate schedule, and the monitor is very straightforward to use.

As an added bonus, you can actually take the monitor device around the house with you for brief spells before returning it to its dock. For individual room and zone control, it's one of the best smart thermostats around.

Heatmiser Neo Best smart thermostat 2020

10. Heatmiser Neo

HomeKit-compatible, but needs pro installation

Display: Blue backlit screen
Sensors: Temperature; Air
Connectivity: Wireless Mesh Network (via neoHub)
Compatibility: not stated **Colours** Sapphire Black; Glacier White; Platinum Silver
Reasons to buy
+Easy to use smart thermostat and app+HomeKit compatible+Includes geofencing
Reasons to avoid
-Professional installation needed-Options list can be confusing

This intuitive zonal system is similar to the Heat Genius we mentioned above, only it's fully wired, which means a) installation should be carried out by a pro (like many other units here) and b) your walls will likely need to have conduits installed.

It's a much more baffling system to get one's head around, mind, since there's a bewildering assortment of different mix-and-match options available. In this respect you're advised to contact Heatmiser direct to discuss your needs. If you can make sense of the various combinations — and it is possible — this could be the best smart thermostat solution for you.

A wireless version of the Heatmiser system (which we haven't had a look it) is  also available in kit form. Dubbed, the neoAir Kit Gen 2, it comprises a neoAir smart thermostat, a second-generation neoHub and an RF switch and is capable of being DIY installed. If you find the wired Heatmiser Neo a little overwhelming, consider the wireless alternative.

Both wired Neo and wireless NeoAir versions are Apple HomeKit compatible, so you can use them as part of your Apple-run smart home. The Heatmiser kit looks good, works well, and is flexible enough to be able to adapt to most home scenarios — just don't be afraid to ask for advice about which setup is best.