A plate heat exchanger having a stack of plates with spaces between the plates defining passages for hot and cold fluids. The ends of the plates define inlet and outlet openings for the fluid passages. The openings are enlarged by bending the end of one of the two plates for each flow path away from the corresponding end of the other of these plates and welding it to an adjacent plate. Preferably the ends of the plates are triangular, or V-shaped, to lengthen the openings along each edge of the V.
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