variations thereof herein is meant to encompass the items listed thereafter and equivalents thereof as well as additional items unless specified or limited otherwise the terms u201c mounted u201d u201c connected u201d u201c supported u201d and u201c coupled u201d and variations thereof are used broadly and encompass both direct and indirect mountings connections supports and couplings further u201c connected u201d and u201c coupled u201d are not restricted to physical or mechanical connections or couplings the basic material of those parts of the heat exchangers which are shown in the exemplary embodiments is a stainless steel in other exemplary embodiments which are not shown it can be for example an aluminum alloy or another metal which can be brazed with correspondingly different brazing materials fig1 shows a view into an uppermost channel 2 a which is preferably a cooling liquid channel a heat exchanger part 1 in particular a heat exchanger plate 1 with an obliquely raised edge 10 a can be seen the edges 10 a of the plates 1 are connected in order to form the closed channels four holes are situated in said heat exchanger plates 1 a further heat exchanger plate 1 is laid on top in order to form the liquid channel which is shown said further heat exchanger plate not shown might also be a cover plate which normally has somewhat thicker walls than a heat exchanger plate 1 the upper left hand and the upper right hand hole is a part of an inlet channel and an outlet channel 14 15 respectively by means of said inlet and outlet channel 14 15 the channel 2 b not shown which is adjacent.