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Biggest groundwater-geothermal system in Northern Germany

Headquarters and exhibition building of BoltzeGruppe GmbH

5,150 m²
Completed in: 2014

Geo-En service

Planning, construction and management

GeoSave energy system

Heat pump, 7 groundwater circulation wells
380 kW heating, 450 kW cooling

The GeoSave system in Braakin Hamburg is the biggest groundwater geothermal system of Northern Germany. With seven groundwater circulation wells and a heat pump cascade, it supplies heat and cold energies to the highly modern new construction of the commercial enterprise, Boltze. As the system has a monovalent design, it neither emits exhaust gas nor releases any noise in to the environment and thus, fulfils the requirement of sustainability and modernity as specified by the builder. The groundwater circulation wells extract groundwater from approximately forty meters, direct it to the heat pump and finally refeed it into the aquifer. The well for refeeding the groundwater is located approximately twenty meters above the well which extracts the groundwater. Thus, it circulates through long routes via the aquifer and in this process, obtains geothermal heat. This heat pump uses this heat for heating the building. In summer the groundwater circulation well provides cooling to the offices thus rendering an energy-intensive air conditioner.

Icon Hamburg City

Exterior shot of the new administration building

Firmensitze Boltze