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Bosch BTH-RM in Home Assistant

Thermostats & TRV · Zigbee · Room thermostat II

Zigbee2MQTT Quirk included in ZHA

This device is known to both Zigbee integrations: Zigbee2MQTT has a definition for it, and ZHA has a quirk that adapts it.

We have a detailed page on this device with compatibility ratings and prices. Details and compatibility

Facts about this device

Brand
Bosch
Model
BTH-RM
Device type
Thermostats & TRV
Radio
Zigbee
Reports itself as
RBSH-RTH0-BAT-ZB-EU
Zigbee2MQTT
Device page on zigbee2mqtt.io

How the device gets into Home Assistant

  • official ZHA – with a Zigbee coordinator and the ZHA integration; the quirk the device needs is part of ZHA. Integration
  • official Bosch Smart Home Controller – paired with the Bosch Smart Home Controller, which the Bosch SHC integration connects to Home Assistant. Integration
  • add-on Zigbee2MQTT – Zigbee2MQTT runs as an add-on and passes the device on to Home Assistant over MQTT. Integration · Source

Known problems and fixes

Changes proposed for ZHA

  • pull request The Bosch Room Thermostat II does not handle humidity alarm LED control. This pull request would add support to enable users to manage the LED via Home Assistant. since October 5, 2026 · zha-device-handlers #5407
  • pull request The Bosch Room Thermostat II's battery percentage is not calculated from voltage readings in ZHA. This change would let you monitor battery life accurately through Home Assistant. since September 11, 2026 · zha-device-handlers #5322

ZHA quirks for this device

Quirk included in ZHA Recommended quirk

Part of ZHA – Home Assistant uses it on its own, nothing to install.

Adds: Heating demand Valve state Local temperature External temperature Operating mode Heater type Actuator type Sensor connection Temperature display mode Boost heating +8

Source: zha-device-handlers · since zha-quirks 2.2.2
Signature: Bosch / RBSH-RTH0-BAT-ZB-EU

3 more quirks for this device

All quirks in the ZHA quirk database →

Alternatives

The same job from other makers – devices of the same type and radio that work with Home Assistant too.

Sources: Zigbee2MQTT, ZHA quirks, Z-Wave JS, the Matter certification database, Shelly, ESPHome, Tasmota, Tuya Local and the issue trackers on GitHub. Reports are assigned to a device by the identifiers they contain; the sentences come from the integration pages, where a language model writes them from the titles.

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