23 these operation versions include operation as an air conditioner operating to reheat or heat warm up operation wherein the circuit operates as a heat pump with glycol as the heat source stationary operation or operating to heat the heat exchanger wherein after the glycol reaches the necessary temperature the heat pump is switched off and safety function if the refrigerant is unintendedly stored in the refrigerant glycol heat exchanger and does not actively take part in the circuit operation as a cooling plant the heat exchanger is passed by u201c warm u201d glycol and the refrigerant u201c expelled u201d to achieve these variations a multi way directional valve 8 is provided within the coolant circuit the multi way directional valve is adapted to function either as a thermostat or as an electronic valve further the multi way directional valve 8 is adapted to function as an electrical controlling unit so that it can also be used for flow control and hence temperature control of the heat exchanger 3 of the heating system this also allows the system to be smaller by eliminating components normally required for the air conditioning unit referring to fig3 in a second preferred embodiment an electrical controlling unit is adapted such that the flow through the heating heat exchanger is controlled with a multiway water valve 10 whereby a bypass flow is passed over the glycol refrigerant heat exchanger 6 referring to fig4 by using two way water valves 10 the coolant flow can be controlled over both heat exchangers 3 6 or over several heating.