Geothermal energy for 43 townhouses in Burgenland.
Casa Immobilien, Schöll-Bau, and Heizbär are relying on OVUM NHWP geothermal heat pumps in St. Georgen, Siegendorf, and Mattersburg.
In three residential complexes in Burgenland, the townhomes are heated with geothermal energy and cooled via the ceiling in the summer. Each house has its own deep borehole and an OVUM NHWP Brine Heat Pump. The building services were planned and installed by our specialist partner Heizbär, and the construction was carried out by Schöll-Bau on behalf of the developer Casa Immobilien.
Planned with geothermal energy from the very beginning
Hans-Peter Schöll owns a construction company in Burgenland and, since 2021, has also been a real estate developer under the name Casa Immobilien. For his townhouse projects, it was clear from the start: The homes would use geothermal energy from deep boreholes and be heated through the building components—specifically, the concrete slabs.
“Of course, I also wanted to incorporate very regional products and companies, which is how I came across Heizbär. They then introduced me to OVUM’s product, since we absolutely wanted to use deep boreholes […]”
Ing. Mag. Hans-Peter Schöll, MIM, Managing Director of Schöll-Bau GmbH
Heizbär was involved in the planning and development from the very beginning. Harald Grabner, Managing Director of Heizbär, describes the planning of the townhouses as almost three-dimensional: The goal was to make the best possible use of the space in the building for tenants and the developer.
Here's how the plant is set up
Each townhouse is powered by an OVUM NHWP Brine Heat Pump with its own deep borehole as an energy source. Heat is transferred to the rooms via concrete core activation in the ceilings; in the summer, cooling is provided through the same system. Each house is controlled via a Loxone Smart Home system, into which the Heat Pump is integrated via an open interface.
According to Hans-Peter Schöll, temperature and weather forecasts are factored into the Controller, and the ceilings are preheated or pre-cooled as needed. In St. Georgen, surplus electricity from the individual homes’ photovoltaic systems is also stored directly in the concrete ceilings, as project manager Andreas Stöckler of Heizbär explains.
“We naturally draw energy from this deep geothermal probe so that we can cool in the summer and heat in the winter.”
Andreas Stöckler, Project Manager at Heizbär GesmbH
Three locations, one concept
St. Georgen in the Leitha Mountains
First joint project, launched in 2022. 23 OVUM NHWP geothermal heat pumps, one deep borehole per townhouse, concrete core activation, and excess PV energy stored in the ceilings as tanks.
Siegendorf
Second townhouse project: three Quattro developments with 12 townhouses. 12 OVUM NHWP geothermal heat pumps; each house has a duplex probe with a drilling depth of 110 meters.
Mattersburg
On Wassergasse: two sets of four Quattro homes, for a total of 8 townhouses. Each home features an OVUM NHWP geothermal heat pump, its own deep borehole, and Loxone Smart Home technology.
Result: klimaaktiv Gold certification and fully leased
According to Harald Grabner, the projects, which combine heating and cooling via the ceiling, smart home technology, and the OVUM NHWP heat pump, have achieved klimaaktiv Gold status, an external certification of the building standard. According to Hans-Peter Schöll, the houses have been fully let since their handover.
“The customer feedback has been sensational, due to the fact that the brine pumps are so quiet and, it must also be said, very aesthetically pleasing.”
Ing. Mag. Hans-Peter Schöll, MIM, Managing Director Schöll-Bau GmbH
Outlook: OVUM CUBIC for Larger Residential Buildings
For upcoming projects, the partners are relying on the OVUM CUBIC. According to Harald Grabner, it is a stackable Brine Heat Pump with 2 to 7 kW per module that can be cascaded up to 54 kW, suitable for everything from townhouses to larger residential buildings. If one module fails, the others continue to operate. Schöll-Bau and Heizbär are currently working together on a larger residential complex.
The Project in the Video
Hans-Peter Schöll and Harald Grabner talk about their collaboration, while Andreas Stöckler demonstrates the technology on site. About 5 minutes.
Project at a Glance
| Properties | 43 townhouses in three residential complexes: St. Georgen am Leithagebirge (23), Siegendorf (12), Mattersburg (8) |
|---|---|
| Real Estate Developer | Casa Real Estate |
| Construction Company | Schöll-Bau GmbH |
| Building Services | Heizbär GesmbH, Planning and Installation |
| Plant | One OVUM NHWP Brine Heat Pump per house with its own deep borehole; heating and cooling via concrete core activation; Loxone Smart Home |
| Time Period | Since 2022 (St. Georgen as the first joint project) |
| Result | “klimaaktiv Gold” certification according to Heizbär; fully leased according to the developer |
Implemented by a partner company
Contractor: Heizbär GesmbH, planning and installation of building services.