Heat and energy recovery units

Heat recovery is mechanical ventilation with heat recovery, in which stale air is removed from rooms while fresh outdoor air is supplied to the building at the same time. Both air streams pass through the heat recovery unit but do not mix. Thermal energy from the extracted air is transferred to the supply air via the exchanger, improving the room's thermal comfort.

In practice, heat recovery is responsible not only for energy recovery but also for constant air exchange in the building. Filters help keep the indoor air clean by removing larger contaminants, dust and suspended particles.

The cost of a heat recovery system depends primarily on the type of building, the required unit capacity, the length and layout of the ventilation system, the type of heat recovery unit and the scope of the control automation.

A different budget will be needed for a complete heat recovery system in a detached house than for a single wall-mounted heat recovery unit intended for one room.

When pricing a project, you should account not only for the purchase of the unit itself, but also for the design or selection of the installation, ventilation ducts, supply and extract air components, duct insulation, installation, airflow balancing and subsequent operation.

The POLY enthalpy exchanger is made of a polyethylene material with a graphene layer, making it more durable than its cellulose counterpart. The cellulose exchanger can be easily recycled. Both exchangers offer the same performance.

The type of exchanger in the ventilation unit does not affect electricity consumption. However, a clear energy saving can be seen in winter — heating costs for the building can be lower thanks to efficient heat recovery. In summer, heat recovery works differently: the unit's automation activates the bypass so that the supply air bypasses the heat exchanger, preventing the room from being heated. This ensures constant thermal comfort.

The duct heater, also known as a pre-heater, has a temperature sensor that can be freely set. The sensor will automatically switch the duct heater on and off once the set temperature is exceeded. It is recommended that the duct heater switches on below an outdoor temperature reading of -9°C, to prevent the enthalpy exchanger from freezing.

The additional Wi-Fi module can only be installed in the VERTIC, INSPIRO and INSPIRO POLY models. The INSPIRO BASIC series does not support the Wi-Fi module, so this need should be taken into account already at the unit selection stage. In the WALLER series, the Wi-Fi function is available in dedicated variants of the unit, such as WALLER Wi-Fi and WALLER Wi-Fi CO₂/RH.

A technical inspection of the heat recovery unit should be carried out at least once a year, while the filters and exchanger should be checked more frequently — in line with the technical documentation for the given model and the filter alarm indications. In practice, the maintenance frequency depends on the operating conditions, the level of air dustiness and the type of filter used.

Yes, regular filter replacement is necessary, because filters protect the exchanger and fans from getting dirty, while also affecting the quality of the air supplied to the rooms. A dirty filter increases flow resistance, which can reduce ventilation performance, increase fan energy consumption and worsen the comfort of using the system.

The frequency of filter replacement depends on the filter class, the intensity of the heat recovery unit's operation, the location of the building and the level of pollutants in the outdoor air. In practice, filters should be checked periodically and replaced according to the recommendations in the unit's technical documentation, or whenever the filter alarm activates.

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