Heat pump for a vehicle

A heat pump, comprising:

• a refrigerant loop comprising:
• a refrigerant network of conduits that fluidly couples components of the refrigerant loop;
• a first heat exchange fluid circulating through the refrigerant network of conduits;
• a compressor having a low-pressure inlet, a mid-pressure inlet, and an outlet;
• a first heat exchanger;
• a first region of a second heat exchanger;
• a third heat exchanger;
• a fourth heat exchanger;
• a first heat exchange fluid;
• a vapor generator positioned downstream of the outlet of the compressor and upstream of both the low-pressure inlet and the mid-pressure inlet;
• a first three-way valve positioned downstream of the outlet of the compressor and upstream of an inlet of the first heat exchanger, wherein the first three-way valve is positioned upstream of the first region of the second heat exchanger;
• a four-way valve positioned immediately upstream of the first heat exchanger;
• and
• a plurality of additional valves, at least one of which is selectively operable as a shutoff valve to prevent compressor-driven flow through a portion of the refrigerant loop, wherein at least one component chosen from the group consisting of the third heat exchanger, the fourth heat exchanger, and the vapor generator is free from compressor-driven flow of the heat exchange fluid during a first predetermined set of heating modes of operation of the heat pump and a predetermined set of cooling modes of operation of the heat pump.