Smart Thermostat Installation Cost UK (2026): Hive vs Tado, Fitted
Unit prices, fitted prices, who charges a subscription, and where the savings really come from.
A smart thermostat costs £180 to £320 supplied and fitted in the UK at the time of writing: £80 to £220 for the unit and £60 to £150 for the labour. Add smart radiator valves across a three-bed house and the job is nearer £650 to £900. Here is where the money goes, and what it actually saves.
In short
- The Hive Thermostat Mini is the cheapest route at roughly £180 to £240 fitted; Tado is about £215 fitted. Google stopped selling new Nest thermostats in Europe in 2025, so Nest is now a legacy choice here.
- Labour for a straight swap is £60 to £150. It rises when the boiler wiring has to change or a receiver has to be added.
- Tado puts geofencing and Auto-Assist behind a subscription of about £3.99 a month or £29.99 a year. Hive works fully without one.
- Manufacturers claim savings of 10 to 30%. The real saving comes from heating the rooms you use, when you use them, which radiator valves do far better than one wall thermostat.
- A smart thermostat does nothing for a badly insulated house. If the windows rattle, spend the first £200 on draught-proofing.
What a smart thermostat actually is
A smart thermostat is a heating control that connects to your WiFi, so you set the temperature and the schedule from your phone instead of at the wall. Most can also turn the heating down when the house is empty, using your phone's location, and learn the shape of your week. It replaces the existing room thermostat and timer; the boiler, radiators and pipework stay as they are. It is a control, not a heat source, so it only saves money by running the boiler for fewer hours, or at a lower temperature, than the old timer did.
Our smart home beginners guide explains where a thermostat sits among the first things worth buying: usually second, after decent WiFi.
Smart thermostat prices in 2026
Prices are at the time of writing, rounded, for the standard product. The fitted price assumes a straight swap for an existing room thermostat on a combi or system boiler. We give fixed written quotes, so the price you are quoted is the price you pay.
| Product | Unit price | Supplied and fitted | Subscription | Best for |
|---|---|---|---|---|
| Hive Thermostat Mini | £80 to £120 | £180 to £240 | None | Simple schedules, tight budget |
| Tado Smart Thermostat | About £160 | About £215 | £3.99 a month or £29.99 a year for Auto-Assist | Geofencing, OpenTherm, adding valves later |
| Tado X with smart radiator valves (3-bed house) | Depends on radiator count | £650 to £900 | As above | Room-by-room control |
| Nest Learning Thermostat (legacy) | Remaining stock only | £255 to £320 while stock lasts | None | Existing Nest homes; Google stopped selling new Nest thermostats in Europe in 2025 |
| Honeywell Home T6R | From £120 | £180 to £270 | None | Plain wireless stat with OpenTherm |
Why the spread on labour? A wireless thermostat that pairs with a receiver already on the boiler is a forty-minute job. The price climbs when the old stat is a battery unit with no link to the boiler, so a receiver has to be fitted and wired, or when the boiler's terminals need working out. Our earlier are smart thermostats worth it post does the payback maths.
Where the fitting goes wrong, and where it costs more
The boiler end is where DIY goes wrong. The room end is easy, a thermostat on the wall or a stand, but every boiler has terminals for the room thermostat, usually a live, a neutral and a switched live, and the receiver has to be wired to match. Get it wrong and the boiler runs constantly, never runs, or trips. That is the step that turns an hour of DIY into a Saturday with the boiler cover off and the heating down. We test the call for heat before we leave, and the fitting carries our 12-month workmanship warranty.
OpenTherm, the word to ask about
Most thermostats switch the boiler on and off like a light. OpenTherm lets the thermostat tell a compatible boiler how hard to work, so it runs low and steady instead of blasting and stopping, and a condensing boiler running that way uses less gas. Tado, Nest and the Honeywell T6R can talk OpenTherm to a boiler that supports it; Hive is on/off only. Heat pumps want to run low and long, so an on/off thermostat fights them: ask the heat pump installer which controls they approve before buying anything.
Put the thermostat where the family sits
The old wired stat is nearly always in the hall, the coldest room in the house and the one nobody sits in. A wireless thermostat can live on the lounge bookcase, so the heating runs to the temperature in the room you actually use. That does more for comfort than any app feature.
Will a smart thermostat save you money?
Manufacturers quote savings of 10 to 30%. The independent evidence is thinner and sits at the lower end, and the result depends on how wasteful the old setup was. If you already turn the heating off when you go out, a smart thermostat mostly buys convenience. If it has run 06:00 to 23:00 regardless of who was home, it pays back quickly. Our smart home energy in 2026 post has the wider picture on tariffs.
Radiator valves save more than the thermostat
A single wall thermostat still heats every radiator in the house to satisfy one room. Smart radiator valves let the spare room sit at 15°C while the lounge is at 21°C, and that is where the real saving comes from: heating the rooms you use, when you use them. It is why the Tado X set with valves costs three to four times as much as a thermostat alone, and why it is the version we would recommend for a family house. Nothing here fixes a badly insulated house; if it leaks heat, spend on draught-proofing and insulation first.
One heating zone in a West Sussex semi
Most of the houses we work in around Horsham, Crawley, Burgess Hill and Haywards Heath are 1930s semis, 1960s estates or older brick-and-flint cottages, and nearly all of them have one heating zone: one thermostat, one timer, every radiator on together. A smart thermostat on its own does not change that. A thermostat plus six or eight smart radiator valves turns a one-zone house into six or eight zones with no plumbing and no new pipework, the most effective heating upgrade for this kind of property. See smart home installation in Horsham for what a visit from us looks like.
Which one we would fit
On a tight budget, the Hive Thermostat Mini: cheap, dependable, no subscription. For most families, Tado, because the valves turn one zone into many and Tado X works over Matter, so it sits beside Apple, Google and Amazon. If you already live in Google Home and want it to learn your week, Nest. For a plain wireless stat with OpenTherm and nothing to subscribe to, the Honeywell T6R.
Our part goes beyond the swap. We link the heating to the lighting and the goodnight scene so one button turns the whole house down, and set the away mode so an empty house is never heated. That is the difference between a thermostat with an app and a smart home that quietly saves money. Our Black Friday smart home guide covers when to buy the unit.
Ofgem sets the January price cap on 25 November and the forecasts point upwards. Our guide to the heating settings that cut the bill covers what to change first, most of it free.
Want a fixed price for your boiler and your house?
Tell us the boiler model and how many radiators you have and we will give you a fixed written quote for a thermostat, or a thermostat with valves, fitted as part of our smart home installation service. The survey is free.
Book a Free SurveyFrequently Asked Questions
Can I fit a smart thermostat myself?
Often, yes, if you are replacing a wireless thermostat and the receiver at the boiler stays where it is. It gets harder when a receiver has to be wired to the boiler terminals, because the diagrams assume you know which one is the switched live. If in doubt, pay the £60 to £150 for a fitting.
How long does it take to fit a smart thermostat?
A straight swap for an existing wireless thermostat takes 40 minutes to an hour, including pairing and setting the first schedule. Wiring a new receiver at the boiler adds about an hour. A thermostat with six to eight smart radiator valves is a half-day job, most of it pairing each valve and naming the rooms in the app.
Does a smart thermostat need a subscription?
Hive and Honeywell do not, and nor did Nest. Tado works without one, but geofencing that turns the heating down when everyone leaves, and Auto-Assist, sit behind a plan of about £3.99 a month or £29.99 a year at the time of writing. If that is the feature you are buying Tado for, add it to the price when you compare.
Will a smart thermostat work with my boiler?
Almost every combi and system boiler in the UK will take one, because they all have terminals for a room thermostat. What varies is the features you get: OpenTherm modulation only works with a boiler that supports it, and Hive does not offer it at all. Heat pumps are the exception, so check with the heat pump installer before you buy.