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Vaillant Group
Vaillant Group

Compact and Flexible to Install

The new aroTHERM pro

Special

2026-04-27
  • Products
  • Company

Compact heat pump for new builds, modernisation and hybrid systems

The new aroTHERM pro from Vaillant is among the most compact air-to-water heat pumps across all output sizes (5 kW, 7 kW and 11 kW). It is therefore particularly suitable for single and multi family homes where outdoor space is limited.

Thanks to Vaillant’s industry unique safety concept, the Flexible Space Function (FSF), required protective zones can be reduced to a minimum. This enables a higher degree of flexibility for outdoor installation, depending on the building situation.

The new aroTHERM pro is characterised by:

  • Compact design: With a unit height of approx. 0.75 m (5 kW and 7 kW) to 1.10 m (11 kW), the aroTHERM pro remains particularly compact across all output sizes.

  • Flexible outdoor installation: Minimal protective zone allows maximal freedom of positioning.

  • Versatile application: Thanks to high flow temperatures, suitable for modernisation projects with existing radiators as well as for new builds.

  • High efficiency: Energy efficiency class up to A+++ (A+++ to D, ErP), supporting efficient use of energy in heating operation.

Delivery of the aroTHERM pro in the 5 kW and 7 kW output sizes will begin in April 2026. The 11 kW version will follow from June 2026.


Flexible to install

With the Flexible Space Function (FSF), Vaillant expands the possibilities for outdoor installation of heat pumps using the refrigerant R290. The safety concept developed by Vaillant significantly reduces standard protective zones compared with conventional heat pumps. This makes an installation possible even in spaces with structural limitations – for example in close proximity to windows, doors or cellar openings.

Vaillant Group
Vaillant Group
Illustration of the protective zone of the aroTHERM pro when installed near a wall. On the left, standard protective distances; on the right, the reduced safety distances after activation of the Flexible Space Function.
Vaillant Group
Vaillant Group

Compact design for more installation options

Even in the 11 kW version, the aroTHERM pro remains compact with a unit height of around 1.10 m. Even in this higher output class, the aroTHERM pro features a single fan design. Thanks to its low weight and compact construction, it is easy and quick to install.

Vaillant Group
Vaillant Group

High flow temperatures for modernisation and new builds

Depending on operating conditions, flow temperatures of up to 70 °C are possible, making the aroTHERM pro suitable for new builds, renovation and refurbishment projects using underfloor heating or existing radiators.

Vaillant Group
Vaillant Group

Contemporary design for a wide range of architectures

The aroTHERM pro combines a clear, understated aesthetic with functional product design. Finished in modern anthracite, it blends into a variety of architectural environments. The optional base cover can be added to further enhance the appearance.

Vaillant Group
Vaillant Group

Natural refrigerant R290 for future proof heating

The aroTHERM pro operates with the natural refrigerant R290. With a Global Warming Potential (GWP) of just 0.02, it has a very low greenhouse gas impact compared with conventional refrigerants. Thanks to R290, the aroTHERM pro is highly efficient and can also generate high flow temperatures.

Questions & answers

What is special about the Flexible Space Function?

Thanks to the innovative safety concept, the outdoor unit of the heat pump can be positioned at significantly reduced distances from the building. This allows efficient heat pump technology to be used even on small plots with very limited installation space. This is made possible by the industry unique Flexible Space Function (FSF), a safety concept developed by Vaillant.

Once activated by a qualified installer, it significantly reduces standard protective distances, allowing installation in a much wider range of building situations than previously possible.

What differentiates the aroTHERM pro from other heat pumps?

Thanks to its compact design with a single fan, the new Vaillant heat pump requires very little space and can therefore be installed even where conditions are particularly restricted. With an overall height of approx. 1.10 m, it can – depending on the building situation – typically also be installed beneath a window.

Which building types and applications is the aroTHERM pro suitable for?

With flow temperatures of up to 70 °C, the aroTHERM pro is designed for both modernisation projects using existing radiators and new builds with surface heating systems.

This makes it suitable for a wide range of applications – from single family homes to hybrid systems requiring elevated temperature levels.

Can the aroTHERM pro also be used for cooling?

During warmer summer periods, the aroTHERM pro can also contribute to cooling indoor spaces.

When used with surface heating systems such as underfloor heating, temperature controlled comfort cooling is possible. For increased cooling performance, the system can optionally be extended with fan coil units.

This enables the aroTHERM pro to contribute to a comfortable indoor climate throughout the year.

This makes the aroTHERM pro a flexible solution for both heating and cooling, supporting comfortable indoor temperatures throughout the year.

Which digital services are available for the aroTHERM pro?

Initially in Germany, Vaillant offers digital services for the aroTHERM pro and aroTHERM plus heat pumps that can help reduce operating costs.

OptimierungPLUS continuously monitors and analyses current operating parameters. Where necessary, heat pump settings are automatically adjusted to suit the building and its occupants, potentially reducing energy consumption and costs by up to 15 per cent, depending on building characteristics, usage behaviour and system configuration.

EnergiePLUS supports the predictive use of self generated photovoltaic electricity, helping to further optimise energy consumption and operating costs. Alternatively, when combined with dynamic electricity tariffs, EnergiePLUS can identify lower market prices and shift heat pump operation to more cost effective time windows.

In combination with photovoltaic systems, this enables greater energy savings and more efficient energy use of self generated electricity.

The aroTHERM pro can be conveniently operated. Integrated connectivity enables easy live monitoring and remote service, supported by digital services via the myVAILLANT app.

Vaillant Group
Vaillant Group

Vaillant’s most compact air‑to‑water heat pump in its power class

With the new aroTHERM pro, Vaillant brings efficient heat pump technology even to locations where space is limited – thanks to its compact design and a flexible outdoor installation.

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