Home ventilation - a hot topic 

Reducing germ exposure ensures a healthy living environment 

  •  Controlled home ventilators replace polluted air with fresh outdoor air. 
  •  Prevention of mould growth protects health and building fabric. 
  • Heat recovery saves heating costs and protects the climate. 
  •  Integrated climate solutions for high room air quality by Viessmann. 

Allendorf (Eder), 13.05.2020 ⎯ Fresh, clean and above all, as germ free as possible indoor air is more important today than ever before. This is because viruses such as the corona pathogen Sars-CoV-2 travel from one person to another mainly via droplet infection, for example when coughing or sneezing. According to a study by the US National Institute of Health, once the small droplets are released in the room, they remain in the air for up to three hours. Viessmann’s integrated solutions help to counteract this, by removing the polluted air from living spaces and replacing it with filtered fresh air from outside. This way the spread of germs is contained, because the concentration of germs in fresh outdoor air is small, if at all.

High room air quality prevents mould and protects the building fabric

Modern home ventilation systems achieve even more with regards to people’s wellbeing in their living and professional spaces. Nowadays each individual spends around 90% of their time indoors. Over time, the level of carbon dioxide (CO2 level) indoors increases- the air is at some point ‘used up’ and we become tired, our ability to concentrate and perform notably decreases. Added to this, there are vapours, odours as well as moisture from showering, bathing and cooking. In particular, too much moisture encourages the growth of mould, which can cause lasting damage to people’s health and building fabric. Automatic home ventilation (also known as controlled home ventilation) gets rid of all these substances as well as moisture quietly and inconspicuously. At the same time, it supplies the room with fresh air to protect people’s health and the building fabric.

With conventional and uncontrolled ventilation by opening windows, on the other hand, dust from the street and pollen can enter the home with the outside air, which is particularly irritating for allergy sufferers. Highly effective filters, built into the ventilators as part of the standard model - and on request also particularly fine pollen filters - reliably prevent this. Last but not least the controlled home ventilator also keeps out disturbing noise from the street outside.

Saving heating costs with heat recovery

Heat recovery is a special technique used with controlled home ventilation, which helps to save costs when you are using your heating. A heat exchanger extracts the heat from the outgoing air and transfers it to the incoming fresh air. The two air streams do not come into contact, so there is no chance the fresh air supply will be contaminated. Up to 90 percent of the heat contained in the outgoing air can be recovered in winter. This saves a considerable amount of energy compared to conventional window ventilation, where a share of heat is always lost.

Cool indoor air on hot summer days

Due to the increasingly warmer summer months, owners of the controlled home ventilator appreciate the possibility of being able to use passive cooling. For this purpose, the heat recovery system’s heat exchanger is bypassed via an automatically controlled bypass damper and cool outside air is fed into the rooms during the nighttime. This ensures a pleasant room temperature and restful night's sleep even in the warmer seasons.

Central or decentral ventilation for your own home?

Depending on the application, a distinction is made between central and decentral systems for controlled home systems.

With central home ventilation, a single unit supplies individual rooms with fresh air. A central ventilation unit is therefore installed on the wall or ceiling. On the one hand, a fresh air supply can reach rooms such as the living room, the childrens’ room and the bedroom via ducts, which are usually concealed in the floor or ceiling. On the other hand, exhaust air is extracted from rooms such as the kitchen, bathroom and the toilet. Central systems are mainly used in new buildings, as they require a higher planning effort. However, it is also possible to use them in an existing building, for example as part of a modernisation project that is already being carried out.

A good example of a modern central home ventilation system is the new, particularly quiet and compact Vitovent 300-W. Combined with a Vitocal heat pump from Viessmann, the ventilation system can be conveniently operated at any time using the free ViCare app via smartphone. In addition, at the request of the operator, a specialist technician can also check the system online to ensure that it is always functioning correctly and identify maintenance requirements at an early stage. Nevertheless, the Vitovent 300-W can also be operated as a stand-alone system. A filter system with an optional pollen filter effectively cleans the air supply of pollutants and pollen. The growth and spread of mites and moulds are significantly reduced, creating an irritation-free room environment. In the colder seasons, the integrated heat exchanger recovers up to 92 percent of the heat contained in the exhaust air, thus helping to save heating costs.

Subsequent installation without great effort

In contrast to the central ventilation system, the decentralised home ventilation is installed in individual rooms. It can also be retrofitted without great effort, as it does not require ventilation ducts and is therefore also suitable for existing buildings. The decentralised ventilation system can however also be installed into a new build. This option is particularly useful for apartment buildings (only certain rooms) or for annexes.

With the decentralised home ventilation system Vitovent 100-D, individual rooms, sections of an apartment (so-called ventilation zones) or the entire apartment can be ventilated and aerated with virtually no heat losses. This is because the integral heat recovery system recovers up to 91 percent of the heat from the exhaust air and transfers it to the fresh incoming air. In addition to a central control unit with a touch display, the ventilation system can be controlled intuitively and easily via the new ViAir-D app using a smartphone, or even by voice command.

Free and non-binding expert advice

Central or decentral home ventilation system? To find out which ventilation system is best suited to which building and to individual requirements you can receive expert advice. Those interested can register for an individual, free and non-binding consultation with a specialist company at:



Frische, saubere und vor allem möglichst keimfreie Raumluft ist heute so wichtig wie nie zuvor: Eine kontrollierte Wohnungslüftung entfernt stetig belastete Luft aus den Wohnräumen und ersetzt sie durch frische, saubere Zuluft. 


Das neue zentrale Wohnungslüftungssystem Vitovent 300-W (rechts) von Viessmann ist besonders leise und kompakt. Es eignet sich besonders für Neubauten und gewinnt bis zu 92 Prozent der Wärme aus der Abluft zurück.


Dezentrale Lüftungssysteme wie das abgebildete Vitovent 100-D sind dank einfacher Installation in die Außenwand ideal für bestehende Ein- und Mehrfamilienhäuser geeignet.