Consisting of easy-to-install pre-assembled safety assembly with lockable connection for expansion vessel 18l / 0.5 bar pre-pressure, ball valves 1', large vent valve 1' and electronically controlled brine pump 0 - 10 V (energy efficiency class A, temperature range of the pumped medium -10°C to +95 °C, operating temperature range -10°C to +40°C) for ground collectors according to the planning documents (without brine circuit distributor and without piping). In the case of different dimensions or ground probes, the free pressure must be checked.