Petershagen
The new housing complex usesa ground-source heat pump in each of the six multi-family buildings for both Space Heating and Domestic Hot Water.
Lessons learned
- Passive cooling with ground heat exchanger
- Photovoltaic system and battery storage device
Key facts
Building | Heat Pump and Source | ||
Location | Petershagen, Germany | Number of HP | 7 |
Construction | 2018 et seqq. | Installed power | 7 x 36 kW (P-rated) |
Heat distribution | underfloor heating | Operation mode | monoenergetic |
Heated area | – m² | Heat source | geothermal |
No. of apartments | 80 (in 6 buildings) | Flowline temperature | 68°C |
level of insulation | very good (new building) | ||
Heating sytem | Domestic Hot Water | ||
Heat demand | – kWh / (m²a) | DHW demand | – kWh / (m²a) |
Heating temperature | – °C | Type of system | fresh water station in each system |
Max. temperature | – °C | ||
Circulation system | – | ||
Other information | |||
PV & ST installation | yes | COP | – |
Buffer storages | 4 x 950l | ||
Description of the technical concept

In each building a heat pump system is installed. Each system consists of one ground-source heat pump (á 36 kW; ERP label), a GHEX, four buffer storages (á 950 L) and four heating rods installed in the storage tanks. Two buffer storages are used for room heating and two for domestic hot water. Due to the “2 step tandem compressor“ with injection technology the maximum flowline temperature of the heat pump is 68°C.
In the residential buildings fresh water stations are installed in each flat. In the community house one fresh water station supplies the DHW for the building.
In summer the GHEX are used for passive cooling of the buildings.
Photovoltaic panels are installed on the roofs of each building. If the energy production exceeds the electric load (heat pump, households, etc.) the heat pump can heat up the buffer storages to temperatures higher than the actual set point. Additionally, the battery storage device is charged.
DE003 Energy Island
- Source: Bosch Thermotechnik GmbH ↩︎