Heat exchanger arrangement, in particular for a vehicle heating device, comprising: - a pot-like inner heat exchanger housing with a first bottom wall and a first circumferential wall joining the first bottom wall and surrounding a longitudinal axis, - a pot-like outer heat exchanger housing with a second bottom wall and a second circumferential wall joining the second bottom wall and surrounding the longitudinal axis, - a fluid flow space formed between the inner heat exchanger housing and the outer heat exchanger housing, - a first flow guidance structure extending substantially in the direction of said longitudinal axis along the first circumferential wall and the second circumferential wall, and a second flow guidance structure extending substantially in the direction of said longitudinal axis along the first circumferential wall and the second circumferential wall with a circumferential distance to the first flow guidance structure,wherein the first flow guidance structure and the second flow guidance structure divide the part of the fluid flow space formed between the first circumferential wall and the second circumferential wall into a first partial flow space and a second partial flow space, wherein each flow guidance structure (40, 42) comprises at one circumferential wall out of the first circumferential wall and the second circumferential wall a radially projecting first web (54, 56) and at the other circumferential wall out of the first circumferential wall and the second circumferential wall a depression (58, 60) receiving the first web (54, 56), - at least one fluid entry opening open towards the first partial flow space and at least one fluid exit opening open towards the second partial flow space, characterized by a press fit structure for fixing the inner heat exchanger housing in relation to the outer heat exchanger housing, wherein the press fit structure comprises the first flow guidance structure and the second flow guidance structure for forming a press fit seat by an axial movement of the web (54, 56) of a corresponding flow guidance structure (40, 42) in relation to the receiving depression (58, 60). - a pot-like inner heat exchanger housing with a first bottom wall and a first circumferential wall joining the first bottom wall and surrounding a longitudinal axis, - a pot-like outer heat exchanger housing with a second bottom wall and a second circumferential wall joining the second bottom wall and surrounding the longitudinal axis, - a fluid flow space formed between the inner heat exchanger housing and the outer heat exchanger housing, - a first flow guidance structure extending substantially in the direction of said longitudinal axis along the first circumferential wall and the second circumferential wall, and a second flow guidance structure extending substantially in the direction of said longitudinal axis along the first circumferential wall and the second circumferential wall with a circumferential distance to the first flow guidance structure,wherein the first flow guidance structure and the second flow guidance structure divide the part of the fluid flow space formed between the first circumferential wall and the second circumferential wall into a first partial flow space and a second partial flow space, wherein each flow guidance structure (40, 42) comprises at one circumferential wall out of the first circumferential wall and the second circumferential wall a radially projecting first web (54, 56) and at the other circumferential wall out of the first circumferential wall and the second circumferential wall a depression (58, 60) receiving the first web (54, 56), - at least one fluid entry opening open towards the first partial flow space and at least one fluid exit opening open towards the second partial flow space,