The invention relates to a plate heat exchanger that consists of several pieces
of sheet metal that are arranged parallel to one another, that are at least partially
corrugated and that form a considerable number of heat-exchange passages. A header
creates a flow connection among at least some of the heat-exchange passages. At
least two parts (1, 2, 3) of the plate heat exchanger consist of metallic
materials that cannot be welded to one another.
