Combinable assembly with insulating shells for connecting a hot water or swimming pool preparation system. Can be used for a heating water flow of up to max. 2.5 m/h (WWM 25) or 3.5 m3/h (WWM 32). Consists of two ball valves with check valve, 2 integrated thermometers, pump ball valve, insulating shells, installation option for circulation pump, pitch 180 mm, which is to be designed according to the pressure loss of the heating system (not included in delivery).