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1. A plate heat exchanger comprising a top head, a bottom head, four side panels and four corner girders, wherein the side panels and the corner girders extend along a longitudinal direction from the bottom head to the top head, wherein each side panel is associated with two corner girders, wherein the top head, the bottom head, the four side panels and the four corner girders are joined together to form a sealed enclosure for housing a plate pack of stacked heat-exchanging plates, wherein a continuous gasket assembly is arranged in a contact region between at least one side panel and two corner girders, the top head and the bottom head, wherein the gasket assembly is located in a groove, wherein the gasket assembly is a segmented gasket assembly composed of a plurality of gasket segments, wherein each gasket segment is made of graphite material, wherein the groove has a substantially rectangular-shaped transverse cross-section, in a mounted and metal-to-metal contact state of the at least one side wall, with a certain depth-dimension in an intended compression direction of the gasket assembly and with a certain width-dimension perpendicular to the intended compression direction, and wherein a depth/width-ratio of the transverse cross-section of the groove is in the range of 0.6-1.4.
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