The holiday program in detail
System owners, on the other hand, can use the program to enter arrival and departure dates for each individual heating circuit. This means that they can actively influence the heating characteristics of the heat generator. The holiday program of a Viessmann heating system specifically affects central heating, DHW heating, heating output and energy consumption:
- For heating circuits in the "Heating and DHW" operating program, the holiday program heats the rooms to the set reduced room temperature.
- For heating circuits in the "DHW only" operating program, there is no room heating. However, frost protection for the boiler and the DHW cylinder is active.
- If holiday mode is activated for all heating circuits, there is no DHW heating. However, frost protection for the DHW cylinder is active.
Please note: In the factory settings, the holiday program starts at 00:00 h on the day following your departure and ends at 00:00 h on the day of your return. This means that the set time program is active on the day of departure and return. The time can also be set individually on some models. To end the program manually, please follow the instructions.
The holiday program reduces the heating output
When the holiday program is activated, the system maintains a lower set room temperature. It only heats to a previously set reduced room temperature. This temperature should not fall below 16 degrees Celsius, otherwise there is an increased risk of mould forming. You can read up in our guide to preventing mould on how you can minimise this risk.
The holiday program helps to save energy
The holiday program feature of a Viessmann heating system gives system owners the opportunity to save energy during their absence by only heating as much as is necessary. Contrary to what the name suggests, the program is not intended solely for use during "multi-week holidays" in the traditional sense. If system owners know they are going to be away – even just for a few days – they can activate the holiday program and so save on heating costs.