A decentral heating pump system can reduce the heating energy consumption by 20 percent in comparison to a conventional heating system. This was the result of a detailed test over several months performed at the Fraunhofer Institute for Building Physics in Holzkirchen near Munich. In the practical test the scientists compared the heating energy consumption of two identical single family buildings with the same user behaviour during a complete heating period. The analysis of the monitoring data has resulted in 20 percent heating energy reduction and additionally 50 percent less auxiliary electricity use for the heating system. The results have now been certified by TÜV Rheinland.
The reduction of the heating energy is made possible through a new basic principle of the heating system allowing to distribute the heat more efficient than conventional systems. Each radiator is supplied with heat only in case of demand. This is realised no more by a big central circulation pump in the cellar, but by decentral miniature pumps at the radiators. Thus a quicker, more precise and therefore significantly more efficient heating of the radiators is possible. The heating circuit water is no longer pumped through the pipes against the throttling of the thermostats and the heat losses are reduced. The decentral pump system is the result of a research project at WILO SE that was sponsored by the German Ministry of Economy and Technology. An earlier BINE project info reported in 2006 about the project status at that time. Since summer 2009 the product is available on the market.