Exhaust gas heat exchanger

The heat exchanger (1) comprises a tube bundle with exhaust pipes (15) and coolant housing (2) which encloses the tube bundle and refrigerant inlet (3) and coolant outlet (4). A three-dimensional coolant guide device (5) is formed between tube bundle and housing for adjusting coolant channel (6,7), such that the refrigerant inlet is opened into the coolant channel.