Sustainable energy efficiency for a residential estate via an air-source heat pump system

Wiener Neustadt, Austria

General house and system information

The facts

The energy concept


The facts

The facts

  • New district comprising 50 detached houses
  • Low-energy design with 150–170 m² of living space
  • Heat load < 40 kWh/m2a
  • Own garden for every house in spite of small plot size

The energy concept

The energy concept

  • Heat pump flexoTHERM exclusive VWL 87/4 with output of 8 kW for heating, cooling and hot water generation
  • Hot water cylinder uniSTOR VIH RW 300
  • Extra quiet aroCOLLECT outdoor unit – developed in line with the playground equipment standard for maximum safety
  • Panel heaters for heat distribution
  • Photovoltaic system auroPOWER VPV P (2 kWp)
  • Battery storage system eloPACK VSE


Wiener Neustadt

This air-source heat pump system is installed in Austria, Wiener Neustadt.

The dream of having your own home

For young families in particular, the dream of owning your own home is challenging in cities like Vienna because building land prices are so high. In Wiener Neustadt, however, this dream has been realised. The family found a new home in a newly developed residential district.

The challenge

The building density on a site with 50 detached houses meant that there were special building technology requirements. To make cost-effective use of renewable energy, an air-source heat pump system was considered. It needed to have particularly low noise emissions and be able to incorporate photovoltaics if requested in the future.

The solution

The centrepiece of the heating system is the flexoTHERM exclusive VWF 87/4 heat pump in combination with the aroCOLLECT outdoor air unit. This is an especially quiet outdoor unit and suited to densely built plots of land, either on a residential or terraced housing estate.

The aroCOLLECT air unit placed in the garden complies with the DIN EN 1176 playground equipment standard and is therefore especially robust and safe.

A uniSTOR VIH RW 300 with cylinder capacity of 300 litres was installed for hot water generation.

The project was equipped with Vaillant photovoltaics as standard. With the 2kW auroPOWER photovoltaic system on every roof, residents can permanently reduce their emissions and electricity costs. Each can be retrofitted with an eloPACK battery storage system.

Why choosing Vaillant is a good decision

Combining comfortable living space with a smart energy concept constitutes a market advantage for building contractors and they have picked the right partner for projects of this kind with Vaillant: reliably big, with a high degree of brand awareness, offering high quality and comprehensive services ranging from planning to commissioning. In particular, Vaillant is a one-stop shop for system solutions in which the components work together in perfect harmony.

Vaillant is a reliable choice for home owners too. In the unlikely event of a problem, customer service is there to help in next to no time.

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