Vaillant aroVAIR pro VA 3-025 WN - wall-mounted fan coil 2.7 kW

Product detailed description

Vaillant aroVAIR pro VA 3-025 WN is a wall-mounted fan coil (fan convector) from the Vaillant aroVAIR pro family, designed as a full replacement for a classic radiator where, in addition to heating, you also want the option of active cooling and dehumidification during the summer. The unit is hung on the wall exactly like a standard panel radiator, but unlike a radiator it contains a heat exchanger with forced air flow driven by a quiet DC inverter fan. This allows it to heat and cool a room considerably faster than large-area heating, while operating at low heating water temperatures, which makes it a natural partner for the Vaillant aroTHERM plus heat pump. This is the smallest output stage in the VA 3-WN range, ideal for smaller rooms, children's rooms or studies. The rated cooling capacity reaches 2.70 kW and heating capacity up to 2.94 kW, unit dimensions are 915 x 290 x 230 mm.

Technical parameters VA 3-025 WN

The stated cooling and heating capacity values represent rated operating parameters under the standard reference conditions specified by the manufacturer (the difference between room air temperature and the temperature of the heat-transfer water in the circuit) - in practice, the exact output varies slightly depending on the actual return water temperature from the heat pump, the flow rate through the exchanger and the set fan speed. The three stated air flow values (492 / 454 / 400 m3/h) correspond to high, medium and low fan speeds - higher speeds mean a faster ramp-up to the required temperature, lower speeds a quieter, more comfortable operation, for example at night.

Why choose the Vaillant aroVAIR pro WN wall-mounted fan coil

WN wall-mounted fan coils are a solution for anyone who wants air-conditioning-like comfort in an apartment or house without having to deal with a refrigerant circuit, drilling the facade for an outdoor unit, or servicing the cooling circuit with a technician certified for refrigerants. The fan coil runs on water - the same water that already circulates in the house's heating system - so all it needs is a connection to an existing or newly built low-temperature heating circuit. In combination with a heat pump, a single outdoor device (the heat pump) can supply heat and cold to any number of indoor fan coil units, and each room can have its own independently adjustable comfort level. This is a fundamental difference from classic split air-conditioning, where every room needs its own indoor and outdoor unit or a complex multi-split system.

Another advantage is the speed of temperature control. Underfloor or wall-based large-area heating has high thermal inertia - a change in the set temperature only shows an effect after hours. Thanks to forced air flow over the heat-exchange surface, a fan coil reacts to a change in demand within minutes, which you will especially appreciate during the transitional spring and autumn periods, when it is cold outside in the morning and warm in the afternoon.

Who is the VA 3-025 WN intended for

This smallest model in the VA 3-WN range is optimal for rooms with a typical heat loss of roughly up to 2.5-3 kW - typically smaller bedrooms, children's rooms, studies, hallways or bathrooms in new buildings or well-insulated renovated houses. Thanks to its compact dimensions (915 x 290 x 230 mm), the unit also fits on a shorter section of wall where a large panel radiator would not fit, for example between a door and the corner of a room.

Installation and connection

The VA 3-WN wall unit is mounted on the wall using the supplied mounting bracket, similarly to a classic panel radiator - the recommended height from the floor is approximately 15-20 cm, so that free air circulation is maintained both below and above the unit. The supply and return pipes for the heating/cooling water connect to the bottom or side of the casing (depending on the specific version), and the VA 3-WN model has a 3-way switching valve integrated directly into the unit body - this means that when switching between heating and cooling mode, there is no need to install a separate switching valve in the pipework, which simplifies and reduces the cost of installation, especially with several fan coils connected to a single manifold. The delivery also includes a condensate drain hose, which in cooling mode needs to be led into a drain or collection vessel, since cooling the air below the dew point on the exchanger naturally causes condensation of moisture from the air.

The electrical supply is standard single-phase 230 V; the unit is controlled either by the supplied wireless remote control with an LCD display, or optionally by the Vaillant VA 1-WC WK wired wall controller, which is installed on the room wall and, besides control, also offers more precise measurement of room temperature directly where people are present (instead of measuring at the air intake into the unit under the ceiling or by the wall).

Compatibility with heat sources

Fan coils in the aroVAIR pro range are designed primarily to work with Vaillant aroTHERM and aroTHERM plus (air-to-water) heat pumps, where thanks to their ability to work with low heating water temperatures (typically 35-45 °C) they maintain a high heating COP for the heat pump while also enabling summer cooling by connecting to the cold water circuit from the heat pump in reverse mode. The unit can equally well be connected to a Vaillant flexoTHERM (ground-to-water) heat pump, or used as a supplementary heating element in a system with a Vaillant ecoTEC or ecoCOMPACT condensing boiler - in this case the unit only works in heating mode (cooling requires a source of cold water). We recommend having the design of the number and output of fan coils, as well as the hydraulic connection (manifold, circulation pumps, mixing or switching valve as applicable), worked out by an authorised designer or a Vaillant heat pump installation company, to guarantee correct function and the manufacturer's warranty.

Control and user comfort

The VA 3-025 WN unit comes with a wireless remote control with a backlit LCD display, which can easily switch between Auto, Heating, Cooling, Ventilation and Drying (dehumidification) modes, set three fan speed levels (low/medium/high), or leave automatic speed control according to the deviation from the set temperature. A weekly time programme and a night eco mode are also available, which slightly reduces the unit's output and fan noise during sleep. If you prefer fixed wall control instead of a remote control (for example in shared spaces where a remote control can get lost), the unit can be complemented with the Vaillant VA 1-WC WK wired controller, which offers the same functions plus more precise temperature measurement directly at the point of installation on the wall.

Maintenance and care

Vaillant aroVAIR pro fan coil units have a replaceable / washable air filter built in behind the front grille, which captures dust and some allergens before they get inside the exchanger. It is recommended to check the filter and, if necessary, clean it with a vacuum cleaner or rinse it with lukewarm water approximately once every 4-8 weeks during a season of intensive use (both heating and cooling); under normal operation, a check once every 2-3 months is sufficient. A clogged filter reduces air flow, increases noise and reduces the unit's output, so regular checking pays off. In cooling mode, it is advisable to check the condensate drain patency once a year (preferably before the start of the summer season) to prevent it from accumulating inside the unit. The exchanger itself and the fan usually do not require any service intervention; only an occasional visual check of the tightness of the hydraulic connections during a heating system service inspection is recommended.

Frequently Asked Questions

Summary - why choose the VA 3-025 WN

The Vaillant aroVAIR pro VA 3-025 WN is a well-thought-out compromise between compact dimensions, sufficient output for smaller and medium-sized rooms, and full heating and cooling function from a single device. The integrated 3-way valve, quiet DC fan and the option of adding a wired wall controller make it a practical choice for new builds and renovations, where a Vaillant heat pump is the source of heat and cold.

Comparison with a classic radiator

A classic panel or ladder radiator can only heat a room, and with considerable thermal inertia - after lowering the set temperature on the thermostatic head, the radiator still radiates residual heat from the large volume of water in the body for a long time. The VA 3-025 WN fan coil, in contrast, has a substantially smaller water volume in the exchanger and transfers heat via flowing air, so the reaction to a change in demand is a matter of minutes, not hours. The second fundamental difference is bidirectional function - while a radiator serves exclusively for heating, a fan coil connected to a cold water source (typically a heat pump in reverse operation) actively cools and partially dehumidifies the air through the same exchanger, which you will appreciate in summer especially in attics, south-facing rooms or rooms with large glazed areas, where indoor heat accumulates significantly during the day.

The third difference is air filtration - since room air passes through the unit via forced flow, the built-in filter continuously captures some dust and coarser allergens, which is completely absent with a static radiator. On the other hand, you need to take into account that a fan coil contains moving parts (the fan) and is therefore not completely maintenance-free like a radiator - occasional filter inspection and cleaning is a necessary part of operation.

Energy efficiency and operating costs

Since the VA 3-025 WN can work efficiently even at a low heating water temperature (typically 35-45 °C), it allows the Vaillant aroTHERM plus heat pump to maintain a high heating COP throughout the entire heating season - the lower the required water temperature, the less electrical energy the heat pump consumes to heat it. This is a fundamental difference compared to older high-temperature radiator systems, which, with the same heat pump, require a higher water temperature (often 55 °C or more) and thus reduce its efficiency. In summer cooling mode, the fan coil also only consumes the energy needed to drive the fan (units of the order of tens of watts), since the actual "generation" of cold is provided by the heat pump outdoors - compared to a standalone split air-conditioning system, a combined heat pump + fan coil system therefore saves on the number of compressors and outdoor units that would otherwise need to be installed and maintained.