sensor:
  - platform: template
    sensors:
      mazout_value:
        friendly_name: "Mazout Value"
        value_template: >-
          {% if not is_state('sensor.mazout_ultrasonic_sensor', 'unavailable') and
                not is_state('sensor.mazout_ultrasonic_sensor', 'unknown') %}
            {{ states('sensor.mazout_ultrasonic_sensor') }}
          {% else %}
            {{ states.sensor.mazout_value.state }}
          {% endif %}