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Adding heating circuits to Home Assistant
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With the preconfigured YAML you only get support for thermostats of heating circuit 1 (HC1).
However, lots of systems have a thermostat coupled to another heating circuit.

To add support for more circuits add the following code to climate.yaml:

.. code-block:: yaml

  - platform: mqtt
    name: Thermostat HC2
    modes:
      - "auto"
      - "heat"
      - "off"
    mode_command_topic: "home/ems-esp/thermostat_cmd_mode2"
    temperature_command_topic: "home/ems-esp/thermostat_cmd_temp2"
     
    mode_state_topic: "home/ems-esp/thermostat_data"
    current_temperature_topic: "home/ems-esp/thermostat_data"
    temperature_state_topic: "home/ems-esp/thermostat_data"
  
    mode_state_template: "{% if value_json.hc2.mode == 'manual' %} heat {% else %} {{value_json.hc2.mode}} {% endif %}"
  
    current_temperature_template: "{{ value_json.hc2.currtemp }}"
    temperature_state_template: "{{ value_json.hc2.seltemp }}"
     
    temp_step: 0.5

The example above adds a thermostat for heating circuit 2.
You can do the same for heating circuits 3 and 4 by replacing the '2' with a '3' or '4'.

Restart Home Assistant after making the modifications.