Single room ERV

WALLER Series

Choosing a specific model from the WALLER series depends primarily on the room volume, expected airflow, control method, and whether automatic response to air quality is needed. WALLER 64 is the basic wall-mounted heat recovery unit with simple remote control, sufficient for maintaining clean air in a single residential room. WALLER Wi-Fi is worth choosing if you care about mobile app operation and programming operating schedules, for example in a home office or an apartment in a block. WALLER Wi-Fi CO₂ is suitable for intensively used rooms (offices, meeting rooms, living rooms, conference rooms) where carbon dioxide concentration periodically increases. WALLER Wi-Fi RH is designed for rooms where relative humidity control is key, such as bathrooms, kitchens, or rooms prone to periodic condensation. For each model, you must take into account the installation conditions specified in the manual and the facility parameters.

In a typical scenario, different WALLER models are used in different rooms of a building, selected for the specifics of each one. For example, in a house of about 100 m², WALLER RH can be installed in the bathroom instead of a standard exhaust fan, and WALLER CO₂ in the living room or study. Such a layout provides fresh air where we need it most, simultaneously reacting automatically to various air parameters in each room (CO₂ in the rest zone, humidity in the sanitary zone). Combining several WALLER units within one building is a flexible and scalable solution, allowing for the gradual expansion of the system as needed.

The WALLER heat recovery unit is suitable for installation in walls up to 420 mm thick. For thicker walls, it is possible to use a dedicated extension duct, which allows for the correct installation of the device even in walls of greater thickness, up to 800 mm maximum.

All WALLER models use the same construction type: a ceramic regenerative heat exchanger. In regenerative mode, the exchanger accumulates heat from the air extracted from the room (for 75 seconds), then changes direction and transfers the stored energy to the fresh air supplied from the outside for the next 75 seconds. Heat recovery efficiency in this technology reaches 76%, which allows for significantly reducing energy losses compared to gravity ventilation. The ceramic structure of the exchanger has another advantage: it also partially recovers moisture from the extracted air, which supports a more comfortable microclimate in the room, especially during the heating season.

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

In regenerative mode, a single unit operates alternately: for 75 seconds it extracts warm, stale air from the room, heating the ceramic exchanger, and then changes direction and for the next 75 seconds supplies fresh outdoor air, heated by the energy stored in the ceramic. This cycle allows for achieving high heat recovery efficiency from the extracted air (up to 76%). On the other hand, ventilation mode allows setting continuous supply or extract without changing direction, but to maintain the proper air balance in the room, it requires synchronizing the operation of two separate WALLER units (one works on extract, the other on supply). Ventilation mode works mainly in periodic situations, e.g., quick room ventilation after the presence of a larger number of people.

The WALLER Wi-Fi RH model can be considered for rooms where humidity periodically rises, as it reacts to exceeding the set RH threshold and can support the removal of humid air. However, it should not be unconditionally described as a substitute for a bathroom fan. Before installation, you must check the operating conditions specified in the documentation, including the permissible relative humidity, IP22 protection rating, 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 (according to the recommendations in the technical documentation and the intensity of the device's operation) and periodically cleaning the ceramic exchanger of dust and impurity deposits. A neglected filter increases flow resistance and can reduce the efficiency of the device's operation, which translates into lower energy savings relative to the system's technical capabilities. Thanks to the compact decentralized design of the heat recovery unit, service access is simple, and filter replacement does not require dismantling the entire device from the wall.

Yes, our sales and technical departments are always available to you in case of any additional questions regarding an order or the product itself. Additionally, we provide product training for B2B companies.