Potable water heat exchanger

Abstract

Heat exchanger, which is a spiral passage heat exchanger, which includes a primary and a secondary passage, characterized in that the primary passage is formed by a straight tube (2), the secondary passage is formed by a rectangular cross-section passage (3) arranged in a spiral shape on the outer side of the shell of the tube (2), the two ends of which are provided with a connecting element (4) arranged near the connecting flange (5) of the tube (2), and the outer side of the rectangular cross-section passage (3) is bounded by a casing (6).