The present invention relates to an improved heat exchanger. This heat exchanger comprises a stack of alternating heat conducting conduits for passage of a first medium, combined with open cell porous media which are interconnected in a material tight way. The volume porosity of the open cell porous media ranges between 90 and 98% and the wire thickness of the open cell porous media ranges from 100 to 600µm. The invention further relates to a method for producing such a heat exchanger and use of such a heat exchanger.