The built-in thermostat is tailored to the requirements of various heating systems. Various functions enable optimal management of energy resources: The optimum start function saves heating energy as the thermostat "learns" how much lead time is necessary to reach the desired temperature at the set time. This avoids unnecessary and costly preheating. If the residents are away for several days, the temperature can be lowered and, with the vacation function, increased back to a comfortable room climate just in time for their return. To do this, only the start and end dates of the vacation need to be entered. However, if someone is only away for a few hours, the temperature can be adjusted to meet specific needs using the party short-term timer, without requiring any changes to the program. If the temperature is usually lowered during the day on weekdays, it can...