The Reiss family proves that even older buildings with radiators can be heated efficiently using a LAMBDA heat pump—sustainably and reliably.
In the Oberwart district of southern Burgenland, the Reiss family decided to switch to a LAMBDA heat pump. Since 2022, their home, built in 1948, has been heated efficiently and environmentally friendly using renewable energy. Despite using traditional radiators as the distribution system, the system impresses with its high efficiency and reliable operation.
Sustainable Heating in Existing Buildings
The single-family home, with a living area of 210 m², was originally heated with natural gas. For environmental reasons, the system was converted in 2022 to a heat pump from the Eureka series (EU13L).
Three renovated tiled stoves remain in operation to provide additional heating capacity as needed. In addition, the wood gasifier (built in 1992) is retained as a backup, particularly due to initial concerns regarding the lack of a low-temperature system in the older building. Since commissioning on September 30, 2022, the heat pump has consumed an average of 6,300 kWh of electricity per year, producing 30,000 kWh of heat output. This results in an annual coefficient of performance (hot water and heating) of an impressive 4.8. Compared to gas heating, heating costs have been more than halved by the heat pump alone. Thanks to the photovoltaic system, the actual operating costs are even significantly lower.
Decision in favor of LAMBDA and Sailer AHS GmbH
When choosing a new heating system, quality and reliability were the top priorities for the Reiss family. The LAMBDA heat pump impressed them with its high-quality workmanship, innovative technology, and the recommendation from their installer, Sailer AHS GmbH.
The experienced team at Sailer AHS handled the planning, installation, and fine-tuning of the system—a collaborative partnership that plays a key role in ensuring efficient operation.
Efficient even with radiators
Although the older building does not have a low-temperature system, the heat pump operates efficiently and reliably in heating mode. Thanks to an optimal hydraulic system combined with a buffer tank and professional installation by Sailer AHS, the system ensures even heat distribution throughout the entire house.
After some initial skepticism, the Reiss family is now very satisfied with the system’s performance and the comfort it provides.
Key Technical Specifications of the Project
Location | Southern Burgenland, Oberwart District |
Year of construction | 1948 |
Living area | 210 m² |
Heating system | Radiators |
Heat pump commissioning | 2022 |
Hydraulic system | Buffer tank combination |
Photovoltaic system | 8.1 kWp |
Renovation measures | None as part of the heat pump installation; windows replaced in 2001 |
Electricity consumption | 6,300 kWh electricity consumption with 30,000 kWh heat output |
Annual performance factor (APF) | 4.8 |
Conclusion
The Reiss family’s case study in southern Burgenland demonstrates that a LAMBDA heat pump offers an economical and sustainable heating solution even in older existing buildings equipped with radiators. Combined with professional installation by Sailer AHS GmbH, this has resulted in an efficient, comfortable, and environmentally friendly heating system. The use of state-of-the-art heat pump technology significantly reduces energy consumption—a major contribution to climate-friendly heating.
