Combined heating/hot water system (10) for a vehicle (12), comprising an air heating device (14), at least one air duct (20, 22, 24), by means of which the air heating device (14) is connected by air to an interior (30) of the vehicle (12) for heating, a fan (18), by means of which air heated in the air heating device (14) may be introduced into the interior (30) of the vehicle (12) for heating, a hot water reservoir (16) arranged in a recess (15) in the air heating device (14), a first pipe duct (36), by means of which the hot water reservoir (16) may be hydraulically connected to a tap (34) in the vehicle (12) and a second pipe duct (38), by means of which the hot water reservoir (16) is hydraulically coupled to a water tank (32), wherein at least one of the pipe ducts (36, 38) is arranged in one of the air ducts (20, 22, 24).