A heat exchanger having a shell lined with a plurality of heat transfer tubes, heat exchange surface disposed within the shell and submerged in a first heat transfer fluid, and a tube manifold penetrating through the shell and directing a second heat transfer fluid to and from the heat exchange surface. The tube manifold has an elongated L-shaped outer enclosure which has one leg disposed within the shell and the other leg penetrating through the shell, and an elongated L-shaped inner tube which passes through the outer enclosure. A first fluid flow path through the tube manifold is established through the inner tube and a second fluid flow path through the tube manifold is established between the inner tube and the outer enclosure.
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