Extension Kit


The Extension Kit enables you to control your hot water. It is also needed to connect the tado° Smart Thermostat to your heating system if there is no room thermostat or if you have a wireless room thermostat. The Extension Kit works then as a wireless receiver for the heating system.

The Extension Kit can only be used as an additional product of the Smart Thermostat - Starter Kit.

What’s in the box?

tado° Extension Kit, connection cable, terminal block, Euroblock connectors, RAST 5 connectors, 2 screws for wall mounting, 2 anchors for wall mounting, labeling for cables

  • 30 day money-back guarantee
  • 2-year warranty

You can make your home even more comfortable by automating Geofencing and Open Window Detection with the Auto-Assist Skill.* The Auto-Assist Skill is available in the app for only €2.99 per month, and can be cancelled at anytime.

These two Skills also work without Auto-Assist. You will simply be notified via push notifications to (de)activate the heating if the Skills are triggered.


The Extension Kit allows you to use your Smart Thermostat with heating systems that don’t have a thermostat or have a wireless thermostat.

  • Status LED

  • Button


The tado° Extension Kit

connects directly to your heating system via cable. The Smart Thermostat communicates via radio with the Extension Kit to control your heating.

The Extension Kit requires a Smart Thermostat -Starter Kit to work.


More specifications

Power supply:

5-36V DC 0.2A / 100-240V AC 0.2A

Display & Operation:

1 status LED, 1 mechanical button

Dimensions (L x W x H):

Extension Kit 102 x 150 x 28 mm / Package: 175 × 175 × 55 mm


Extension Kit 210g / 550g package


Preparation certified ISO 14001 / ISO 9001 / BS OHSAS 18001 / EU RoHS directive 2011/65 / EU Recyclable packaging

Manufacturer Warranty:

2 years

Internet connection:

via the Internet Bridge which is connected with a network cable to your internet router.

Radio connection (between devices):

868 MHz, Mesh (6LoWPAN)

Data Encryption:

TLS 1.2 (SSL), 2048-bit Extended Validation Certificate / TLS 1.2 (SSL) 256-bit elliptic curve / AES-CCM AES-CCM encryption

Product - Material and surface:

PC + ABS plastic / white, matt


For heating

Uses the outside temperature and the location of the residents for energy-efficient heating control.

Wireless connection for heating

The Extension Kit allows your Smart Thermostat to be wirelessly connected to your heating system.


The Extension Kit is necessary in the following cases:

No thermostat or wireless thermostat

The Extension Kit is needed in addition to a Smart Thermostat - Starter Kit. The Extension Kit connects directly to the boiler via cable and communicates with the Smart Thermostat via radio.

Supported manufacturers










Glow worm

...and many more

Supported heating systems:

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

hydronic underfloor systems

electric underfloor systems with a maximum switching current of 6 A

air source and ground source heat pumps (heating only)

zoned systems (one Smart Thermostat per zone)

relay compatible both switched live systems and potential free (dry contact) systems


Self install

The Extension Kit and the Smart Thermostat - Starter Kit are easy to install yourself. Our online installation guide gives you detailed step-by-step instructions that are tailored to your home heating system.