1.1. Facts

• The residential building offers 8 apartments (3 x 4.5 rooms, 3 x 5.5 rooms, 2 x 2.5 rooms) and is situated in Oberburg, Switzerland.

• To reach optimal solar efficiency the building is orientated towards the south.

• In the 276 m2 sized collector field the water will be heated and later stored in a 205’000 l seasonable hot water tank. In addition to this innovative heating system the building disposes of a above average heat insulation and well insulated windows for passive sun energy generation.

• Because of the size of the tank (17 m height, 4 m diameter), it was installed after the foundation was laid, and then the rest of the building was constructed around it.

• Construction costs: ca. 2 Million Euros (excluding land). Investment for solar system is less than 10 % of overall construction costs.

• The rental price of the eight apartments is average for the area.