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Zigbee devices Thermostats and radiator valves

Bosch BTH-RA

Radiator thermostat II. Works with Zigbee2MQTT with no vendor hub or cloud: it pairs with a Zigbee stick and shows up in Home Assistant.

Vendor
Bosch
Model
BTH-RA
Type
Thermostats and radiator valves
Power
battery: an end device, does not extend the mesh
Firmware updates (OTA)
yes, through Zigbee2MQTT

Find it in shops: AliExpress

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What it exposes

FeaturePropertyValuesControl
Climatelocal_temperature, local_temperature_calibration, occupied_heating_setpoint, system_mode, running_state, pi_heating_demandroom temperature, local_temperature_calibration, heating setpoint, mode, running state, pi_heating_demandsettable
Setpoint change sourcesetpoint_change_sourcemanual, schedule, externallyread only
Operating modeoperating_modeschedule, manual, pausesettable
Open window detectionwindow_detection—settable
Activate boost heatingboost_heating—settable
Remote temperatureremote_temperature°C · 0…35settable
Child lockchild_lock—settable
Display brightnessdisplay_brightness% · 0…100settable
Display switch-on durationdisplay_switch_on_durations · 5…30settable
Display orientationdisplay_orientationstandard_arrangement, rotated_by_180_degreessettable
Displayed temperaturedisplayed_temperatureset_temperature, measured_temperaturesettable
Valve adaptation statusvalve_adapt_statusnone, ready_to_calibrate, calibration_in_progress, error, successread only
Automatic valve adaptation requestedautomatic_valve_adapt—read only
Trigger adaptation processvalve_adapt_processadaptsettable
Error stateerror_state—read only
Batterybattery% · 0…100read only
Low batterybattery_low—read only
Weekly schedule mondayweekly_schedule_monday—settable
Weekly schedule tuesdayweekly_schedule_tuesday—settable
Weekly schedule wednesdayweekly_schedule_wednesday—settable
Weekly schedule thursdayweekly_schedule_thursday—settable
Weekly schedule fridayweekly_schedule_friday—settable
Weekly schedule saturdayweekly_schedule_saturday—settable
Weekly schedule sundayweekly_schedule_sunday—settable

MQTT: state and commands

Zigbee2MQTT publishes the device state to zigbee2mqtt/my_device (my_device is the name you give the device). An example message:

{
  "local_temperature": 20.5,
  "occupied_heating_setpoint": 21,
  "system_mode": "heat",
  "setpoint_change_source": "manual",
  "operating_mode": "schedule",
  "window_detection": false,
  "boost_heating": false,
  "remote_temperature": 18,
  "child_lock": false,
  "display_brightness": 50,
  "display_switch_on_duration": 18,
  "display_orientation": "standard_arrangement",
  "displayed_temperature": "set_temperature",
  "valve_adapt_status": "none",
  "linkquality": 120
}

Send commands to zigbee2mqtt/my_device/set:

mosquitto_pub -t zigbee2mqtt/my_device/set -m '{"occupied_heating_setpoint":21.5}'
mosquitto_pub -t zigbee2mqtt/my_device/set -m '{"system_mode":"heat"}'
mosquitto_pub -t zigbee2mqtt/my_device/set -m '{"operating_mode":"manual"}'
mosquitto_pub -t zigbee2mqtt/my_device/set -m '{"window_detection":true}'
mosquitto_pub -t zigbee2mqtt/my_device/set -m '{"boost_heating":true}'

Watch the topics live from the browser: MQTT client.

Home Assistant automation example

Zigbee2MQTT creates Home Assistant entities from the device name. If it is called my_device, an automation in automations.yaml can look like this:

- alias: "Cooler at night"
  mode: single
  triggers:
    - trigger: time
      at: "23:00:00"
  actions:
    - action: climate.set_temperature
      target:
        entity_id: climate.my_device
      data:
        temperature: 18

Check the YAML: YAML checker.

How to pair it

  1. In Zigbee2MQTT click Permit join.
  2. Put the device in pairing mode: usually a long press of the reset button (5–10 s) until the LED blinks; bulbs: switch the power off and on 5–6 times.
  3. Keep the device close to the coordinator or a router while pairing.
  4. Give it a clear name: MQTT topics and Home Assistant entities are built from it.

Exact procedure and model notes: the device page in the Zigbee2MQTT docs. No coordinator yet: coordinator picker.

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