The invention relates to a water chamber (10) for a motor vehicle (1), which water chamber has a wall (13, 20, 21), which defines a first interior (23). The water chamber (10) also has at least one air inlet opening (9), through which air can flow into the first interior (23), and at least one air outlet opening (25), through which air can flow out of the first interior (23). A water outlet opening (17) is also present, which is suitable for removing water from the first interior (23). The water chamber (10) is designed as a
heat exchanger, comprising a heat exchange element (13, 20, 21; 16′), which is used to transfer
thermal energy from exhaust air into the first interior (23). The water chamber also has a structure (8, 26, 27, 40; 8′) that is used to conduct exhaust air to the heat exchange element (13, 20, 21; 16′) in a controlled manner.