Heat exchanger

A brazed plate heat exchanger (100) for exchanging heat between at least two fluids comprises several elongate heat exchanger plates (110) provided with a pressed pattern comprising depressions and elevations adapted to keep the plates on a distance from one another by contact points between the elevations and depressions of neighboring plates under formation of interplate flow channels for media to exchange heat. At least four port openings are placed in corner regions of the elongate heat exchanger plates and have selective fluid communication with the interplate flow channels such that the fluids to exchange heat will flow between port openings parallel to long sides of the elongate heat exchanger plates. A circumferential seal sealing off the interplate flow channels from communication with the surroundings is provided, and the heat exchanger plates are joined by brazing. The circumferential seal results partly from contact between skirts of neighboring plates contacting one another, said skirts extending at least partly along two sides of each heat exchanger plates, and partly from contact between flat areas extending along two other sides of the heat exchanger plates.