The tado smart radiator valve has earned its place as the best-selling smart TRV in the UK — and for good reason. It fits almost every UK radiator, the app is polished, and the open-window detection is genuinely useful. But with two current ranges (the established V3+ and the newer tado° X), an optional subscription that unlocks the most useful features, and a growing number of competing products, a thorough review is worth reading before you spend upwards of £160 on a starter kit.
Which tado Radiator Valve Should You Buy?
tado currently sells two generations of smart radiator thermostat in the UK.
tado° Smart Radiator Thermostat V3+ is the established model. Starter kits (one valve plus the Internet Bridge hub) are available from around £110–£160 depending on retailer; additional valves cost around £55 each. The V3+ uses tado's own 868 MHz radio protocol and requires the wired Internet Bridge to connect to your home network. It works with Amazon Alexa, Google Home, and Apple HomeKit.
tado° Smart Radiator Thermostat X is the current-generation model, built on the Matter over Thread standard. Individual valves start at around £80, and the Trio or Quattro starter kits include a Thread border router. The tado X uses a USB-C rechargeable battery rather than AAs, features a high-resolution touch display that rotates 180° for flexible mounting, and integrates natively with Apple Home, Google Home, and Amazon Alexa without any proprietary hub. It also supports full local control via Matter — a genuine advantage if you are concerned about cloud dependency.
For most UK buyers in 2026, the V3+ offers the best value unless you specifically need Matter support or hub-free operation. Both models are reviewed below.
Installation: What to Expect
Installing a tado smart radiator valve is a straightforward DIY job. You do not need a plumber for the valve head itself — only if the underlying valve body needs replacing. The process takes roughly ten minutes per radiator.
Step 1: Close the lockshield valve or temporarily drain the radiator. Step 2: Unscrew the existing manual or thermostatic valve head anticlockwise. Step 3: Fit the correct adapter (see compatibility below) and thread on the tado valve body. Step 4: Follow the tado app's guided setup to add the device to your account.
Valve compatibility. The standard M30 × 1.5 mm thread fits most UK radiator bodies. tado includes adapters in the box for the most common valve types found in British homes: Danfoss RA, Danfoss RAV, Danfoss RAVL, and a selection of other manufacturer fittings. The tado compatibility checker on their support site covers hundreds of valve body types — it is worth checking before ordering if your existing valves look unusual.
The tado V3+ Internet Bridge connects via ethernet to your router. The tado X, once paired via the app, connects via Thread — so you will need a Thread border router in range (Apple TV 4K, HomePod mini, or the included tado hub).
Energy Savings: The Honest Numbers
tado claims users save up to 31% on their heating costs. A more conservative and commonly cited figure is an average reduction of around 22% on gas consumption, derived from tado's own user data. Independently, that breaks down as roughly 12% from smart scheduling, 5% from geofencing, and 7% from OpenTherm boiler modulation — though the modulation saving only applies if your thermostat (not just the TRV) supports OpenTherm, and if your boiler has an OpenTherm interface.
At Ofgem's gas unit rate of approximately 6.33p per kWh (July–September 2025 price cap), a 22% saving on a typical UK three-bedroom semi consuming 11,500 kWh annually in gas would equate to roughly £160 per year. Real-world savings will vary based on how often you use geofencing, how well-insulated your home is, and how many rooms you zone.
For a home already using a smart thermostat at the boiler, adding tado smart radiator valves in bedrooms and rarely-used rooms is where you see the incremental gain. Heating only the rooms you are using — rather than the whole house — is the core promise of room-by-room zoning, and tado delivers on it reliably.
The Auto-Assist Subscription: Is It Worth Paying?
This is the most common complaint about tado, and it is worth being clear about what you lose without it. Without a subscription, you get:
- Manual scheduling per room (fully functional)
- Remote app control from anywhere
- Temperature and humidity monitoring
- Basic frost protection mode
With the Auto-Assist subscription (priced at around £3.99/month or £27.99–£29.99/year), you unlock:
- Automatic geofencing — heating drops to Away mode the moment the last person leaves, and warms up before anyone returns, without you needing to do anything
- Open-window detection — the valve pauses heating within 30 seconds of detecting a rapid temperature drop (e.g. an open window), then resumes automatically when the temperature recovers
- Weather adaptation — the schedule adjusts based on forecast outdoor temperatures
- AI Assist (on X-range devices) — predictive pre-heating based on your historical patterns and the weather
If you live alone or have a predictable routine, manual scheduling alone may be sufficient and the subscription optional. For households where everyone comes and goes unpredictably, automatic geofencing is worth the annual cost — the energy it saves typically more than covers £28 per year.
Home Assistant Integration
tado has an official Home Assistant integration, which has been continuously maintained and is well-regarded in the UK Home Assistant community. With the V3+, the integration polls tado's cloud API; as of March 2025, tado updated their authentication method to a device-code flow, so initial setup requires following an in-app URL to authenticate. Once configured, you get climate entities for each room, allowing full automation from Home Assistant — including presence-based heating control without relying on tado's own geofencing subscription.
The tado X, by contrast, supports Matter and therefore integrates with Home Assistant via the native Matter integration for fully local control — no cloud polling required. For anyone building a local-first smart home, the tado X is the more future-proof choice. For more on setting up Home Assistant with UK smart heating, see our guide to Home Assistant heating control in the UK.
Build Quality and App Experience
Both the V3+ and X have a clean, white cylindrical design that sits unobtrusively on most radiators. The V3+ displays the set-point temperature on a simple dot-matrix readout; the tado X has a sharper capacitive touch display and a 180° rotating housing — useful if your radiator valve faces an awkward direction.
The tado app is consistently well-reviewed on both iOS and Android. The per-room energy reporting is one of the more useful features — you can see which rooms are consuming the most energy and adjust schedules accordingly. The Home Report screen breaks down heating hours per room per day, which helps identify if a bedroom radiator is running unnecessarily.
Battery life on the V3+ (two AA batteries) is approximately 12–18 months in typical UK use. The tado X's USB-C rechargeable battery is rated for around two years per charge. Both figures are in line with competing smart TRVs such as the Eve Thermo and Drayton Wiser.
How tado Compares to the Competition
The tado V3+ is the closest thing to an industry standard in UK smart TRVs: widely stocked, well-documented, and with the broadest ecosystem support. Its main rivals are the Drayton Wiser (better value per room for larger homes, no subscription), Eve Thermo (fully local, no account needed, Apple-only), and Hive Smart Radiator Valve (best for existing Hive customers). For a detailed look at all four, our roundup of the best smart radiator valves in the UK compares each on price, ecosystem, and energy savings.
Verdict
The tado Smart Radiator Thermostat V3+ earns its reputation as the best smart TRV for most UK homes. Installation is genuinely DIY-friendly, the app is well-designed, and the hardware is reliable. The open-window detection and geofencing — the features most likely to save you real money — do require the Auto-Assist subscription, but at around £28 per year the payback period is short for any household that heats three or more rooms.
If you are starting from scratch and want the most future-proof option, the tado X is worth the extra outlay: Matter over Thread, local control, and USB-C charging make it a better long-term investment. If you are adding valves to an existing V3+ system or working to a tighter budget, the V3+ add-on valves remain excellent.
