The Jenni-Haus gets neighbours

Even in the depths of winter, residents heat with the sun. Photo: Jenni Energietechnik
Even in the depths of winter, residents heat with the sun. Photo: Jenni Energietechnik

Many people know of the solar-powered house called Jenni-Haus, which was built in 2007. The eight-family house is heated with 100 % solar power and was the first of its kind in 2007. Now, the Swiss company Jenni Energietechnik has begun the construction of two additional 100 %-houses right next to the existing pioneer building. Jenni Energietechnik puts the additional cost of these homes at just over 6 % of the building cost, compared to a reference building with a conventional air-water-heat pump. This means about € 20,000 per apartment. In return, the tenants or buyers of these apartments will never receive a heating bill again.Thanks to the experience gained on the first project, the size of the solar heating system can be reduced this time. The year-round water tank is filled with 108,000 litres in the spring and summer and then in the fall and winter it is gradually emptied. The collector surface is 160 m2.The goal is to make the houses economical. For this reason, eight apartments will be sold at usual market prices between € 430,000 and € 550,000 for the region. The other half of the apartments will be rented at normal market rates. The 4.5 and 5.5-room apartments are each 115 to 130 m2 in size.Completion of the two buildings is planned for the second half of 2014, but no later than early 2015. Jenni is currently looking for land to build further 100 %-solar houses on.Right next to the apartment buildings, Jenni Energietechnik AG is currently building its third production facility in order to expand the production of large solar tanks for the European market.

Jan Gesthuizen

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