Disclosed is a concentration plant with differently-functioning sections. The plant comprises a vertically-developing external tubular sheath (1), internally of which are comprised: a heat exchanger (2), in which a heating fluid coming from a fluid inlet mouth (9) circulates, which heat exchanger (2) is defined by a lower plate (3) and an upper plate (4) on which lower plate (3) and upper plate (4) upper and lower open ends of a first vertically raising tube bundle (5) and a second descending tube bundle (6) are fixed, in which first and second tube bundles (5, 6) the product to be processed circulates; a supply chamber (7), arranged inferiorly of the lower plate (3), which sets an inlet mouth of the product (8) in communication with the lower ends of the tubes of the first tube bundle (5); a pressurised upper chamber (10), arranged superiorly of the upper plate (4), which sets in mutual communication the upper ends of the tubes of the first tube bundle (5) and the second tube bundle (6); a separation chamber (11), which is arranged internally of the sheath (1) and inferiorly of the lower plate (3) and in which the lower ends of the tubes of the second tube bundle (6) open, a product outlet mouth (12) being afforded on a closed bottom of the separation chamber (11), and an outlet opening (13) being afforded on a lateral wall of the separation chamber (11) for exit of steam generated during product concentration.