tado Smart Thermostat - MyBoiler.com

tado° is a room-control kit: a thermostat or wireless sensor in the living space, an Internet Bridge on the router, and — on most UK wireless jobs — a receiver or Extension Kit at the boiler or programmer. Smart Radiator Thermostats can then run rooms individually. The display is not the switching device. The box at the appliance is.

This page expands the old hub.myboiler.com tado notes: the UK manual titles, the HC / HW / EK abbreviations, and which serial prefixes have OpenTherm or a bus. Live wiring steps live in the tado app and tado’s V3+ help centre. Confirm the boiler maker’s interface before you promise modulation. Wiring on a gas boiler is Gas Safe work, not a DIY swap of the old room stat.

Read the receiver model and serial before you quote OpenTherm. A wireless kit with a BP02 receiver (serial BP*) has no OpenTherm or bus. P1 and P2 on that box are parking terminals only.

Which UK kit you are looking at

tado’s own device list for V3+ and earlier is the useful map. You only fit one receiver per home — either a Wireless Receiver or an Extension Kit, not both.

Wired Smart Thermostat — replaces a hard-wired room or underfloor thermostat. The hub notes say this wired kit has OpenTherm.
Wireless Smart Thermostat, including the UK programmer with hot water control — a wireless sensor or thermostat plus a receiver. The UK receiver can replace a two-channel heating and hot water programmer.
Extension Kit (EK) — the older boiler-end box, now discontinued, used in the same jobs as a Wireless Receiver: no room stat, a wireless stat, or a two-channel programmer. tado still documents it because many houses still have one.
Smart Radiator Thermostat — heads on TRVs, often alongside a Smart Thermostat and receiver, for room-by-room control.

tado X is a later product line with its own help. The serial and terminal notes below are the V3+ / Extension Kit generation the hub page recorded. Use tado’s compatibility checker for the kit you are about to buy.

UK manuals

The hub listed these United Kingdom titles. Direct PDF URLs move; current install steps are in the tado app and the installation-instructions article. Professional installers can also use tado’s Manual for Professional Installers from that same help article.

Wired Smart Thermostat Manual
Wireless Smart Thermostat Manual (including programmer with hot water control)
Extension Kit Manual — 230 V relay installations
Extension Kit Manual — low-voltage digital installations
Smart Radiator Thermostat Manual

The 230 V relay booklet is the on/off path. The low-voltage digital booklet is the OpenTherm and bus path. Do not mix them.

Abbreviations

These are the installer-menu labels from the hub notes and the older Extension Kit manuals:

HC — Heating Circuit
HW — Hot water
EK — Extension Kit

OpenTherm and which receiver you have

On/off tado on a boiler that can modulate is a missed trick. OpenTherm is a two-wire digital bus: the control can ask for a flow temperature, not just a call for heat. Manufacturer buses (eBus, EMS, KM-Bus) are not OpenTherm. Treat them as their own interface, and only if that exact receiver supports them.

Kit	How to recognise it	OpenTherm and bus
Wired Smart Thermostat kit	Wired thermostat at the old room-stat position	Has OpenTherm
Wireless kit with receiver BP02	Receiver serial starting BP*	No OpenTherm and no bus (EMS, eBus, KM-Bus, and so on). P1 and P2 are parking connectors — they hold unused wires and have no function
Wireless Extension Kit BR02 or BU02	Receiver serial starting BR* or BU*	Analogue/digital interface including OpenTherm, eBus, KM-Bus, and EMS on terminals A, −, and +

If the job is “tado with OpenTherm”, a BP02 on the wall is the wrong box. Either the wired kit, or a BR02/BU02 Extension Kit that actually has the A / − / + interface, is what the hub notes support. Then confirm the boiler itself has an OpenTherm pair — or a maker-approved OpenTherm module. Vaillant is often eBus plus a VR33, not native OpenTherm. Worcester is usually EMS unless a converter is documented for that model.

Buses listed on the Extension Kit

The hub recorded the BR02/BU02 analogue/digital interface as supporting OpenTherm, eBus (Vaillant) RC, KM-Bus (Viessmann), and EMS (Worcester Bosch), shown on terminals A, −, and +. It also listed these additional buses. This is an inventory from those notes, not a promise that every current tado SKU still speaks all of them, and not a wiring method:

BS Bus
RC
EBUS Ariston Group
EBUS Vaillant RC
VR81 — EBUS Wolf
HT Bus — KM Bus Viessmann RC Vitotrol 200
USA Bus

Pick the interface from tado’s installer menu for the boiler in front of you, then test. “The list mentioned eBus” is not the same as “this Vaillant will modulate on this receiver.”

Specifying on site

Identify what you are replacing: a wired room thermostat, a wireless stat plus receiver, or a two-channel heating and hot water programmer.
Read the receiver model and serial prefix (BP*, BR*, BU*) before you talk about OpenTherm or a manufacturer bus.
Read the boiler terminals from the manufacturer’s diagram: 230 V switched live, volt-free, OpenTherm, eBus, EMS, KM-Bus. Do not put 230 V on a low-voltage pair.
Use the tado app’s system-specific installation instructions, or the professional installer manual, not a generic photo from a previous job.
Check the live tado boiler compatibility notes for the model on the data plate.

A modulating OpenTherm or manufacturer-bus setup is the part that usually moves the needle on a condensing boiler. Room-by-room radiator heads help comfort; they do not replace a correctly chosen boiler interface.

Guidance only, expanded from the hub.myboiler.com tado notes and checked against tado’s public V3+ support articles. Connecting a receiver or Extension Kit to a gas boiler in the UK is Gas Safe work. This is not a DIY wiring guide. Confirm terminals and bus support against the boiler and tado documents for the exact models on site.