Bosch Radiator Thermostat II (EU): what it works with
Bosch · model Radiator Thermostat II (BTH-RA) · For Europe
- Matter Unconfirmed
- Apple Home Via Bosch Smart Home Controller II
- Google Home Via Bosch Smart Home Controller II
- Amazon Alexa Via Bosch Smart Home Controller II
- SmartThings Unconfirmed
- Home Assistant Unconfirmed
Run on 2 × AA batteries, the Bosch Radiator Thermostat II is a Zigbee radiator head for M30 × 1.5 mm valves. Apple Home, Google Home and Alexa all work through the Bosch Smart Home Controller II and the Bosch app, and Bosch says not to run it long-term without that controller. SmartThings and Home Assistant aren't confirmed. The [+M] version with Matter over Thread is a different model.
Checked against 4 sources on
Ecosystem compatibility
| Platform | Works? | Details |
|---|---|---|
| Matter | Unconfirmed | The Zigbee-only version is not itself a Matter device. Bosch's product FAQ says it joins Matter systems through the Controller II as a Matter bridge, but we found no CSA listing for this model.[2] |
| Apple Home | Via Bosch Smart Home Controller II | Bosch's help page says Apple HomeKit works through the Smart Home Controller II and the Bosch Smart Home app.[3] |
| Google Home | Via Bosch Smart Home Controller II | Google Assistant works through the Smart Home Controller and the Bosch app.[3] |
| Amazon Alexa | Via Bosch Smart Home Controller II | Alexa works through the Smart Home Controller and the Bosch app.[3] |
| SmartThings | Unconfirmed | Bosch lists Samsung SmartThings only on the [+M] product page; nothing says how, or whether, the Zigbee-only model connects. |
| Home Assistant | Unconfirmed | Home Assistant's Bosch SHC integration lists a Thermostat Gen2 and a local push controller connection, but does not name the Radiator Thermostat II or the Controller II. |
“Via Matter” means you add it with that platform's Matter controller instead of a brand skill or app. “Unconfirmed” means we couldn't find an official source either way. How we verify.
Specs that matter for setup
- Radio
- Zigbee[1]
- Local control
- Unconfirmed[4]
- Type
- Radiator valve[1]
- Controls
- Radiators with M30 × 1.5 mm valve thread (adapters for some valves)[1]
- Power
- 2 × AA (LR6 alkaline)[1]
- Radio: Zigbee 3.0 in the 2.4 GHz band per the quick guide. The newer [+M] variant adds Thread; this record is the Zigbee-only version.
- Hub: Bosch says not to run it long-term without a Smart Home Controller (no firmware updates), and its FAQ says only [+M] devices can skip the controller.
- Local control: Bosch says the Controller II stores data locally and keeps automations running when the internet is down, but it makes no separate statement for this thermostat.
- Type: Fits onto the radiator valve and controls it.
- Controls: M30 × 1.5 mm connection ring per the quick guide, which says some valves need a supplied adapter or one bought separately.
- Power: Typical battery life is under two years.
Before you buy
- Bosch says not to run it long-term without a Smart Home Controller; there are no firmware updates without one.
- The [+M] version with Matter over Thread is a different model; this record is the Zigbee-only one.
- Bosch's help page says the Controller II does not support Matter or Thread, while a product FAQ says it acts as a Matter bridge; the two pages disagree.
- Some valves need an adapter.
Quick answers
- Does the Bosch Radiator Thermostat II (EU) work with Apple Home?
- Yes, but only through the Bosch Smart Home Controller II. Bosch's help page says Apple HomeKit works through the Smart Home Controller II and the Bosch Smart Home app. More smart thermostats for Apple Home
- Does the Bosch Radiator Thermostat II (EU) work with Google Home?
- Yes, but only through the Bosch Smart Home Controller II. Google Assistant works through the Smart Home Controller and the Bosch app. More smart thermostats for Google Home
- Does the Bosch Radiator Thermostat II (EU) work with Amazon Alexa?
- Yes, but only through the Bosch Smart Home Controller II. Alexa works through the Smart Home Controller and the Bosch app. More smart thermostats for Amazon Alexa
- Does the Bosch Radiator Thermostat II (EU) work with SmartThings?
- Not confirmed. We couldn't find an official source either way. Bosch lists Samsung SmartThings only on the [+M] product page; nothing says how, or whether, the Zigbee-only model connects.
- Does the Bosch Radiator Thermostat II (EU) work with Home Assistant?
- Not confirmed. We couldn't find an official source either way. Home Assistant's Bosch SHC integration lists a Thermostat Gen2 and a local push controller connection, but does not name the Radiator Thermostat II or the Controller II.
Sources
- Radiator thermostat II quick instructions Product description — Bosch Smart Home manufacturer · accessed Oct 12, 2026
- Heizkörper-Thermostat II [+M] — Bosch Smart Home manufacturer · accessed Oct 12, 2026
- Hilfe zum Heizkörper-Thermostat II [+M] — Bosch Smart Home manufacturer · accessed Oct 12, 2026
- Bosch Smart Home Controller II — Bosch Smart Home manufacturer · accessed Oct 12, 2026
Official product page: www.bosch-smarthome.com