Plus energy house: More quality of life

The country’s first Plus Energy House in a publicly subsidized multi-storey residential building is considered to be a model house for the social housing sector: The building produced more energy annually than its residents consume and therefore allows emission-free operation.

Within the context of Innovation City Bottrop, Gesellschaft für Bauen und Wohnen Bottrop mbH (Society for Building and Living) has constructed a Plus Energy new building with public funding. 433 square metres of living space have been divided on four floors and six residential units and equipped with the latest technology. For the inhabitants of the house, all consumable costs for heating, hot water and general electricity are no longer incurred.

Engine for progress:

  • emission-free operation (considered over the year)
  • more energy is produced than is consumed
  • innovative heat recovery from waste water
  • modern living space at favourable conditions

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Photo: InnovationCityManagementGmbH

The Plus Energy House by GBB produces more energy than is consumed annually. This is made possible by a well-balanced interplay between various technical components. Attention is already drawn to the special character of the house at the entrance.

Geothermal energy and sun for a comfortable indoor climate

The heart of the new building is the 31-kWp photovoltaic system on the roof. The current yield of the solar modules is sufficient not only to meet the full power requirements of the house, but also to provide the required heating for the very well-insulated building via a heat pump: Geothermal energy from two 130 metre deep brine boreholes is brought up to the required temperature level using a brine heat pump, which is operated by its own PV system, and carried into the living quarters by an underfloor heating system. In order to increase the efficiency of the heat pump, a waste water heat recovery system was also added to the circuit. Using heat exchangers, the heat is extracted from the grey water in the house (waste water from all sinks, showers and washing machines) and absorbed by the brine before entering the heat pump. This raises the entry temperature level of the aqueous saline solution, thus minimising the compression required for the target temperature.

Goodbye to energy costs...

Overall, the project achieves that which many tenants can only wish for: The future developments in energy prices are no longer of relevance. This is certainly an attractive, future-oriented development.

Photo: GBB

“Through the GBB energy-plus house we are demonstrating that the GBB is fulfilling its social obligation in the context of the InnovationCity Ruhr | Model City Bottrop.”

H.J. Bode, Managing Director, Gesellschaft für Bauen und Wohnen Bottrop GmbH

Partners and sponsors

  • Gesellschaft für Bauen und Wohnen Bottrop mbH
  • KfW-Bank
Counselling centers:
  • EnergieAgentur.NRW