Heat exchanger arrangement, in particular for a vehicle heating device, comprising: - a pot-like internal heat exchanger housing with a first bottom wall in a first axial end region of the heat exchanger arrangement and a first circumferential wall connected to the first bottom wall surrounding a longitudinal axis, - a pot-like external heat exchanger housing with a second bottom wall in the first axial end region of the heat exchanger arrangement and a second circumferential wall connected to the second bottom wall surrounding the longitudinal axis, wherein in a second axial end region of the heat exchanger arrangement, the internal heat exchanger housing and the external heat exchanger housing are connected to each other, - a fluid flow space formed between the internal heat exchanger housing and the external heat exchanger housing, wherein at least in the second axial end region of the heat exchanger arrangement at least one recess open to the outside is provided in the construction material of the internal heat exchanger housing or/and in the construction material of the external heat exchanger housing, wherein at a front side facing away from the bottom walls (18, 22) at least one recess is open to the outside, substantially in the axial direction, wherein in the second axial end region, the internal heat exchanger housing comprises a front wall axially limiting the fluid flow space and adapted in an annular form in the circumferential direction and a fluid inlet opening into the fluid flow space or/and a fluid outlet opening out of the fluid flow space, characterized in that in the region of the fluid inlet opening or/and in the region of the fluid outlet opening the fluid flow space extends beyond the front wall in the axial direction. - a pot-like internal heat exchanger housing with a first bottom wall in a first axial end region of the heat exchanger arrangement and a first circumferential wall connected to the first bottom wall surrounding a longitudinal axis, - a pot-like external heat exchanger housing with a second bottom wall in the first axial end region of the heat exchanger arrangement and a second circumferential wall connected to the second bottom wall surrounding the longitudinal axis, wherein in a second axial end region of the heat exchanger arrangement, the internal heat exchanger housing and the external heat exchanger housing are connected to each other, - a fluid flow space formed between the internal heat exchanger housing and the external heat exchanger housing, wherein at least in the second axial end region of the heat exchanger arrangement at least one recess open to the outside is provided in the construction material of the internal heat exchanger housing or/and in the construction material of the external heat exchanger housing, wherein at a front side facing away from the bottom walls (18, 22) at least one recess is open to the outside, substantially in the axial direction, wherein in the second axial end region, the internal heat exchanger housing comprises a front wall axially limiting the fluid flow space and adapted in an annular form in the circumferential direction and a fluid inlet opening into the fluid flow space or/and a fluid outlet opening out of the fluid flow space,