Tado / Home Assistant - Boiler Last On - configuration.yaml

# Boiler on or off based on heating values
sensor:
  - platform: template
    sensors:
      boiler:
        friendly_name: "Boiler"
        value_template: >-
          {% if states('sensor.dining_room_heating') != '0.0' %}
            On
          {% elif states('sensor.living_room_heating') != '0.0' %}
            On
          {% elif states('sensor.master_bedroom_heating') != '0.0' %}
            On
          {% elif states('sensor.office_heating') != '0.0' %}
            On
          {% elif states('sensor.nursery_heating') != '0.0' %}
            On
          {% elif states('sensor.spare_bedroom_heating') != '0.0' %}
            On
          {% elif states('sensor.utility_heating') != '0.0' %}
            On
          {% else %}
            Off
          {% endif %}
# Read date and time boiler was last on
  - platform: file
    file_path: /share/boilerlaston.txt
    name: Boiler Last On