tado° · Smart thermostats
tado° Wired Smart Thermostat X (2nd gen) Installation in London
Updated
The tado° Wired Smart Thermostat X (2nd gen) is the thin, rechargeable wall thermostat tado° launched in September 2026. It replaces a wired room thermostat and switches the boiler over the cable already in the wall. A vetted JACK pro swaps it in London, matches the wiring to the right terminals and tests the boiler, for a fixed price before you book.
In short
Yes. A vetted JACK pro in London fits the tado° Wired Smart Thermostat X (2nd gen) in place of your wired room thermostat, on the existing cable: switched live or volt-free relay at the wall, or OpenTherm where an OpenTherm cable already runs to the thermostat. tado° says it does not control hot water cylinders, so it suits combi boilers. Wiring at the boiler needs a Gas Safe engineer.
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Wired Smart Thermostat X (2nd gen): key facts
- Model
- RU05; sold on its own or as a starter kit with a Bridge X (IB02) Source: tado° help: starter kits and model codes
- Power
- Rechargeable lithium-ion battery, charged over USB-C; tado° says a charge lasts up to a year Source: tado° help: charging 2nd-gen thermostats and sensors
- Connections
- Volt-free relay (RT/RT) or 230 V relay (L/SL) to its COM and NO terminals; OpenTherm (OT+/OT−) to its + and − terminals Source: tado° installer manual: Smart Thermostat X (2nd gen)
- Switching limit
- Up to 3 A resistive or 1 A inductive load, such as a pump Source: tado° UK shop: Wired Smart Thermostat X (2nd gen) Starter Kit
- Hot water
- Controls on-demand hot water on a combi; does not control a hot water cylinder Source: tado°: smart thermostats for boilers and underfloor heating
- Launched
- 2 September 2026; works alongside 1st-gen tado° X devices in the same Home Source: tado° press release: Smart Thermostat X (2nd gen), 2 September 2026
Model details come from tado°'s UK shop, help centre and installer manuals. tado° can change a design or what comes in the box, so check your own kit and send a photo of it with your request. Last checked 31 October 2026.
How the Wired Smart Thermostat X (2nd gen) is powered and mounted
The 2nd-gen wired thermostat runs on its own rechargeable battery, so the cable in the wall only carries the switching signal. That matters for the job: there is no new supply to run, and the work is a like-for-like swap at the wall on the wiring your old thermostat used.
It has a single normally open relay contact. tado° adds a Relay Mode setting in the app for systems that need normally closed behaviour, mostly some underfloor heating, and warns not to choose it when the thermostat is wired straight to a boiler. Lift it off its wall plate and it stops controlling the heating and switches it off.
In the starter kit it comes with a Bridge X, which plugs into a socket near your router and connects the thermostat to the app.
What the pro checks first
- How the old thermostat is wired: switched live, volt-free contacts or an OpenTherm pair
- The boiler label, against tado°'s compatibility check for relay or OpenTherm
- Whether there is a hot water cylinder, which this thermostat cannot control
- Wi-Fi reach at the socket where the Bridge X will go
What the pro does on the Wired Smart Thermostat X (2nd gen)
- Power to the heating isolated and checked dead before the old thermostat comes off
- Existing wires identified: switched live, volt-free, or an OpenTherm pair already at the wall
- Wall plate fixed with screws, and the wires landed on the matching terminals: COM and NO for relay, + and − for OpenTherm
- Bridge X plugged in near the router and joined to your Wi-Fi
- Thermostat woken with the top button, paired, and the boiler tested on and off from the app
Before you book: what to send
- A photo of your current thermostat, and of its wiring if the front lifts off easily
- The boiler's make and model, from the label
- Whether you have a hot water cylinder: if so, the wireless kit suits you better
- Where your Wi-Fi router is, for the Bridge X
How your existing thermostat wiring maps to the tado° terminals
tado°'s installer manual for the 2nd-gen wired thermostat shows three ways to connect it. The pro reads which one your old thermostat used.
| Your old thermostat | Wired to | On a JACK booking |
|---|---|---|
| 230 V switched live | L and SL to COM and NO | Yes, on the existing cable |
| Volt-free contacts | RT and RT to COM and NO | Yes, on the existing cable |
| OpenTherm pair already at the wall | OT+ and OT− to the + and − terminals | Yes, on the existing cable |
| Relay today, OpenTherm wanted | New connection at the boiler's OpenTherm terminals | No: needs a Gas Safe engineer |
How tado° installation is priced
A vetted pro prices your job from photos of the boiler, your existing controls and the tado° kit, and the JACK app shows you that fixed price before you book.
Full pricing guide for tado° installationFrequently asked questions
Does the tado° Wired Smart Thermostat X need an electrician?
tado°'s shop says no electrician is needed when it replaces your existing room thermostat on the same wiring. On many homes that wiring carries 230 V, so the power has to be isolated and the wires matched to the right terminals, which is what the pro does. Anything at the boiler itself needs a Gas Safe engineer.
Can it control my hot water cylinder?
No. tado° says the wired thermostat does not control hot water cylinders. Homes with a cylinder need the Wireless Smart Thermostat X kit, whose UK receiver replaces the programmer.
How much does tado° Wired Smart Thermostat X (2nd gen) installation cost in London?
It is a fixed price for your Wired Smart Thermostat X (2nd gen), worked out by a vetted pro from the model, a photo of where it is going and what power is there now, and shown in the JACK app before you book. Other devices can go on the same booking for one price. If you would rather pay for time, hourly hire for smart home is typically £45–£95 per hour as a guide.
Often booked together
Smart Radiator Thermostat X installation
The tado° X radiator head (VA04): rechargeable, M30 × 1.5 thread, six adapters in the box.
Bridge X installation
The tado° X Thread border router (IB02): plugs into a socket and joins your Wi-Fi.
Wireless Smart Thermostat X (2nd gen) installation
The 2nd-gen wireless kit: Programmer X receiver plus Wireless Temperature Sensor X (2nd gen).
More tado° smart thermostats
tado° smart thermostat installation
Wired and wireless Smart Thermostat X kits, first and second generation, and V3+ thermostats.
Smart Thermostat X (1st gen) installation
The original tado° X thermostats, wired (RU04) and wireless kit (PR04 + SU04), still on sale.
Wired Smart Thermostat V3+ installation
The V3+ wired thermostat (RU02): refitted on its cable, or swapped when you move to X.
All tado° installation guides
tado° Smart Thermostat X, Wireless Receiver X and radiator thermostats fitted in London by vetted pros who work at the wall, not the boiler. Fixed price first.
Related services in London
Sources
The device facts and rules on this page come from these pages, checked on 31 October 2026.
Jack All Trades (JACK) is an independent London service. It is not part of, affiliated with or endorsed by tado GmbH. tado° product names are used only to describe the devices JACK pros install, and prices are set by JACK pros, not by tado°. JACK pros do not work inside boilers or claim Gas Safe registration.
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