Heat recovery unit

Wall-mounted WALLER

The choice of a specific model from the WALLER series depends mainly on the room's volume, the expected airflow, the control method, and whether an automatic response to air quality is needed. WALLER 64 is a basic wall-mounted heat recovery unit with simple remote control, sufficient to maintain clean air in a single residential room. WALLER Wi-Fi is worth choosing when you want control from a mobile app and the ability to program operating schedules, for example in a home office or a flat in an apartment block. WALLER Wi-Fi CO₂ works well in intensively used rooms (offices, meeting rooms, living rooms, conference rooms), where carbon dioxide concentration periodically rises. WALLER Wi-Fi RH is intended for rooms where controlling relative humidity is key, for example bathrooms, kitchens, or rooms exposed to periodic condensation. For each model, the installation conditions specified in the manual and the building's parameters should be taken into account.

In a typical scenario, different WALLER models are used in different rooms of the building, chosen to match the specifics of each one. For example, in a house of around 100 m², a WALLER RH can be installed in the bathroom instead of a standard extractor fan, and a WALLER CO₂ in the living room or study. Such a setup provides fresh air where it is needed most, while automatically responding to different air parameters in each room (CO₂ in the relaxation zone, humidity in the sanitary zone). Combining several WALLER units within a single building is a flexible, scalable solution, allowing the system to be gradually expanded as needed.

The WALLER heat recovery unit is suitable for installation in walls up to 420 mm thick. For thicker partitions, a dedicated extension duct can be used, which allows the unit to be installed correctly even in walls of greater thickness, up to a maximum of 800 mm.

All WALLER models use the same type of construction: a ceramic regenerative heat exchanger. In regeneration mode, the exchanger stores heat from the air extracted from the room (for 75 seconds), then reverses direction and releases the stored energy to the outdoor supply air over the next 75 seconds. The heat recovery efficiency of this technology reaches 76%, which significantly reduces energy losses compared with gravity ventilation. The ceramic exchanger structure has another advantage: it also partially recovers moisture from the extracted air, supporting a more comfortable indoor microclimate, especially during the heating season.

No, the Wi-Fi module is not available in the WALLER 64 model, which is controlled solely by remote control. To be able to operate the unit from a mobile app, you need to choose one of the WALLER Wi-Fi, WALLER Wi-Fi CO₂ or WALLER Wi-Fi RH variants. It is worth considering this function already at the selection stage, since the Wi-Fi module is not an accessory that can be added to the WALLER 64 after purchase. Wi-Fi models allow remote control, schedule programming and integration with a mobile app on a smartphone or tablet.

In regeneration mode, a single unit operates alternately: for 75 seconds it extracts warm, stale air from the room, heating the ceramic exchanger, then reverses direction and for the next 75 seconds supplies fresh outdoor air, warmed by the heat stored in the ceramic material. This cycle achieves high efficiency in recovering heat from the extracted air (up to 76%). Ventilation mode, on the other hand, allows continuous supply or extract without changing direction, but to maintain the correct air balance in the room it requires synchronising the operation of two separate WALLER units (one working on extract, the other on supply). Ventilation mode works mainly in periodic situations, e.g. quickly airing a room after it has been occupied by a larger number of people.

The WALLER Wi-Fi RH model can be considered for rooms where humidity periodically rises, as it responds when the set RH threshold is exceeded and can help remove humid air. However, it should not be unconditionally described as a replacement for a bathroom extractor fan. Before installation, the operating conditions specified in the documentation must be checked, including the permitted relative humidity, the IP22 protection rating, the location relative to wet zones, and applicable regulations.

Yes, like any ventilation device, the WALLER heat recovery unit requires periodic maintenance. The most important activities are cleaning or replacing the air filter (in line with the recommendations in the technical documentation and the unit's operating intensity) and periodically cleaning the ceramic exchanger of dust and dirt deposits. A neglected filter increases flow resistance and can reduce the unit's operating efficiency, resulting in lower energy savings relative to the system's technical potential. Thanks to the compact, decentralised design of the heat recovery unit, service access is simple, and replacing the filter does not require removing the entire unit from the wall.

Yes, our sales and technical department is always available to you for any additional questions about your order or the product itself. We also run product training for B2B companies.