Abstract: Plate heat exchanger in the form of heat exchanger plates having several corrugated heated surfaces (4) arranged next to one another and tightly sealed with one another, and with two flow paths (10, 11) separated from one another where one of the flow paths (10) has a larger cross-sectional flow through than the other flow path (11), whereby the heat exchanger consists of a number of identically formed plates with an asymmetric cross-sectional shape seen in relation to the central plane (5) of the plate, the lower surface of the grooves of the gasket are located in the central plane of each respective plate, the same sides of every other plate (8) are turned to face the same direction in the heat exchanger, and the equivalent sides of the other plates (9) are turned to face the opposite direction.