The heat pump WPF basic with the GWS module draws its heating energy from the latent energy stored in groundwater. Through an appropriately sized on-site well, the heat pump WPF basic exploits a practically never-ending energy source. After all, in our region, there is no shortage of groundwater. Two well boreholes are sufficient to be able to utilise the energy in groundwater. In many cases that is more favourable than drilling for geothermal probes for a brine|water heat pump. One benefit: All year round, groundwater has a relatively constant temperature, enabling the heat pump to operate with a consistently high COP. The high grade equipment inside the GWS module, such as the plate heat exchanger made from corrosion-resistant stainless steel, ensures a long service life and safe operation. The GWS module can be combined with almost all brine|water heat pumps.