Combinable assembly for easy installation of heat pump, buffer tank and heating system. Consists of a 3-chamber distributor bar with inspection and maintenance opening for insert check valves (bypass), connections for one heating and generator circuit 2'AG, buffer tank connection 2½'AG, safety assembly with 4 bar pressure gauge and ¾' safety valve, filling and draining tap and connection option for an expansion vessel. Delivery includes insulation shells, 4 Victaulic couplings (on 2'AG outlet for the generator and heating circuit) and wall mounting set. Recommended for connecting a heat pump with a heating water flow rate of up to 7.5 m3/h and when feeding external energy (e.g. wood / solar) into the series buffer tank (see project planning documents). To reduce pump running times, the additional circulation pump can only be operated with the compressor. In this case, the return sensor included in the scope of delivery must be installed and connected to the existing immersion sleeve. Due to the hydraulic decoupling, the consumer circuit requires a separate circulation pump (pump and pump ball valves not included in the scope of delivery).