High-efficiency brine accessory package consisting of a pre-assembled connection group (connection of an expansion vessel, quick vent valve, safety valve 2.5 bar and pressure gauge) with lockable cap valve for easy installation of the low-pressure pressure switch SWPR 200 for monitoring the brine circuit in the event of leaks, expansion vessel 18 l / 0.5 bar pre-pressure, ball valves, high-performance vent valve with micro-bubble separation and a high-efficiency brine pump with the control types constant pressure (pc), variable pressure (pv) and fixed speed levels, including cold insulation shell for ground collectors in accordance with the project planning documents (brine circuit distributor and piping not included in delivery). In the case of different dimensions or geothermal probes, the free pressure must be checked.