@staticmethod
def get_heating_status(root):
    """Get the active heating status (OpenTherm control)."""
    log_type = 'central_heating_state'
    locator = ("appliance[type='heater_central']/logs/point_log[type='" +
        log_type + "']/period/measurement")
    if root.find(locator) is not None:
        return root.find(locator).text == 'on'
    return None
