The heat pump system is equipped with boreholes. The heating circuit is operated without a buffer storage. The DHW (Domestic Hot Water) circuit contains a DHW storage. Due to the installation of underfloor heating and low inlet temperatures, perfect conditions for the heat pump system are provided.   

Its efficiency of 4.5 in 2010 lies above the average of 3.9 of ground source systems. The reason for the high efficiency results from the low inlet temperatures of the heating circuit and the high temperatures of the brine circuit in winter. The brine pump's share of 5 % of the overall energy demand is below the average of 6 % which influences the SPF positively. The share of DHW in 2010 amounts to 6 % and thus lies significantly below the average of 18 %. This adds to the system's positive efficiency due to the low temperature needed for heating.


  *in accordance with EN 14511