This ground source heat pump with output-dependent control and inverter technology is installed indoors and combined with a separate buffer and DHW cylinder. • The heat pump can be used in modernisation projects as high flow temperatures of up to 75 °C are available all year round for room heating and DHW heating. Passive cooling is integrated. • The integral heat pump manager enables fully automatic, weather-compensated control of the heating system. • High efficiency circulation pumps and expansion vessels are provided for both the brine side and the heating side. • An insulated pump assembly supplies the heat distribution system.