Current CO2 heat-pump chillers available on the market utilize two evaporators to achieve high energy efficiency values. Space saving of the new compact design is a desired solution from vendors. When using this new concept, only one ‘three-circuit’ brazed heat exchanger is needed. The experimental campaign proofed that an ejector integration enables the two-stage evaporation configuration which significantly elevates the compressor suction pressure and improves the overall system performance. These systems can be applied in several market sectors including industrial chillers with high-capacity demands, where the secondary fluid is cooled even below 0°C.