Forward-looking building equipped with Bosch technology The Energy Plus Home – more than a research project An example of sustainable living

  • Positive energy balance on an annual average
  • Can be completely realised with standard technology
Add to my press materials
Save text
  • December 16, 2011
  • Thermotechnology
  • Press releases

press release

Wetzlar – A single-family home which produces more energy than its residents consume in the course of a year has been handed over to its tenants in the presence of Lord Mayor Wolfram Dette in Wetzlar. Thanks to a photovoltaic system, efficient heating and insulation as well as economical household appliances, the expected energy requirements of 7,550 kilowatt hours p.a. compare with an anticipated electricity generation of 9,100 kilowatt hours p.a. Referred to as an “Energy Plus Home”, the house was built by Bosch Thermotechnology and its Buderus brand as well as building specialists Buderus Immobilien GmbH (BIG) and Schwörer Haus.

“We want to show that such a project can be realised with the technology that is available today,” said Uwe Glock, President of the Board of Management of the Thermotechnology Division. He pointed out that about 40 percent of the total primary energy consumption in Europe and about one third of the carbon emissions are attributable to buildings. Approximately 85 percent of the latter's energy requirements relate to heating and hot water, whereas electricity accounts for a relatively low approximately 15 percent. According to Glock, this discrepancy is attributable to the technical state of most heating systems. “Only 13 percent of the 17.8 million heating systems in Germany represent the latest state of the art.” According to Uwe Glock, carbon emissions could be cut by up to 55 million tons p.a. if the inefficient systems were replaced. He is convinced that the Energy Plus Home will become the standard in the longer run.

To turn from an energy consumer into an energy producer, a building must fulfil three conditions. First, consumption must be kept at a low level with the help of an optimised building shell and the use of residual energy flows. The remaining energy requirements are covered efficiently. Also, the building itself must generate as much electricity as possible. To meet these requirements, the project partners have equipped the Energy Plus Home with modern components such as a photovoltaic system, a heat recovery ventilation system and an electric heat pump with a capacity of up to nine kilowatts. The equipment is completed by modern, low-consumption Bosch household appliances of energy efficiency class A++. Compared to a new building of a good, yet conventional standard, the extra costs amount to about EUR 35,000 for the photovoltaic system.

Thanks to these measures, the primary energy requirements for heating and hot water for the 160 square metre building amount to less than 50 kilowatt hours per square metre and year, compared to 91 kilowatt hours for a comparable conventional building. The photovoltaic modules installed on the roof with a peak capacity of 10.8 kilowatts generate so much electricity that the building's energy balance over the year is positive. The difference is sufficient to cover the energy requirements of four Bosch-driven eBikes, which are made available to the tenants.

Please find further information at the Factsheet.

The Bosch Group is a leading global supplier of technology and services. It employs roughly 375,000 associates worldwide (as of December 31, 2015). The company generated sales of 70.6 billion euros in 2015. Its operations are divided into four business sectors: Mobility Solutions, Industrial Technology, Consumer Goods, and Energy and Building Technology. The Bosch Group comprises Robert Bosch GmbH and its roughly 440 subsidiaries and regional companies in some 60 countries. Including sales and service partners, Bosch’s global manufacturing and sales network covers some 150 countries. The basis for the company’s future growth is its innovative strength. Bosch employs 55,800 associates in research and development at 118 locations across the globe. The Bosch Group’s strategic objective is to deliver innovations for a connected life. Bosch improves quality of life worldwide with products and services that are innovative and spark enthusiasm. In short, Bosch creates technology that is “Invented for life.”

The company was set up in Stuttgart in 1886 by Robert Bosch (1861-1942) as “Workshop for Precision Mechanics and Electrical Engineering.” The special ownership structure of Robert Bosch GmbH guarantees the entrepreneurial freedom of the Bosch Group, making it possible for the company to plan over the long term and to undertake significant up-front investments in the safeguarding of its future. Ninety-two percent of the share capital of Robert Bosch GmbH is held by Robert Bosch Stiftung GmbH, a charitable foundation. The majority of voting rights are held by Robert Bosch Industrietreuhand KG, an industrial trust. The entrepreneurial ownership functions are carried out by the trust. The remaining shares are held by the Bosch family and by Robert Bosch GmbH.

Additional information is available online at and,

PI7620 - December 16, 2011

Your contact person for journalists

Christian Hoenicke

+49 711 811-6285 Send Email

Share this information