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Zigbee devices Thermostats and radiator valves

ElectSmart PRO-900Z

Thermostat for electric floor. Works with Zigbee2MQTT with no vendor hub or cloud: it pairs with a Zigbee stick and shows up in Home Assistant.

Vendor
ElectSmart
Model
PRO-900Z
Type
Thermostats and radiator valves
Power
mains: usually a router that extends the mesh
Firmware updates (OTA)
no

Find it in shops: AliExpress

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What it exposes

FeaturePropertyValuesControl
Child lockchild_lock—settable
ECO modeeco_mode—settable
Eco temperatureeco_temperature°C · 5…30settable
Climatesystem_mode, preset, current_heating_setpoint, local_temperature, local_temperature_calibration, running_statemode, preset, heating setpoint, room temperature, local_temperature_calibration, running statesettable
Deadzone temperaturedeadzone_temperature°C · 1…5settable
Min temperaturemin_temperature°C · 5…15settable
Max temperaturemax_temperature°C · 15…45settable
Low temperature protectionmin_temperature_limit°C · 0…10settable
High temperature protectionmax_temperature_limit°C · 25…70settable
SensorsensorIN, OU, ALsettable
Floor temperatureexternal_temperature_input°Cread only
Screen brightness 06:00 - 22:00brightness0…8settable
Screen brightness 22:00 - 06:00display_brightness0…8settable
Factory resetfactory_resetfactory resetsettable

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:

{
  "child_lock": false,
  "eco_mode": false,
  "eco_temperature": 18,
  "current_heating_setpoint": 21,
  "local_temperature": 20.5,
  "system_mode": "heat",
  "deadzone_temperature": 3,
  "min_temperature": 10,
  "max_temperature": 30,
  "min_temperature_limit": 5,
  "max_temperature_limit": 48,
  "sensor": "IN",
  "external_temperature_input": 0,
  "brightness": 4,
  "linkquality": 120
}

Send commands to zigbee2mqtt/my_device/set:

mosquitto_pub -t zigbee2mqtt/my_device/set -m '{"current_heating_setpoint":21.5}'
mosquitto_pub -t zigbee2mqtt/my_device/set -m '{"system_mode":"heat"}'
mosquitto_pub -t zigbee2mqtt/my_device/set -m '{"child_lock":true}'
mosquitto_pub -t zigbee2mqtt/my_device/set -m '{"eco_mode":true}'
mosquitto_pub -t zigbee2mqtt/my_device/set -m '{"sensor":"OU"}'

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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