Heat exchanger

A plate for use in a heat exchanger, the plate comprising:

• a first surface;
• a second surface extending parallel to and spaced from the first surface;
• first, second and third discrete flow passages passing through the plate from the first surface to the second surface,
• the second flow passage extending around the first flow passage and the third flow passage extending around the second flow passage;
• a plurality of fins extending parallel to the first surface across the third flow passage and having a first fin surface extending parallel to the first surface of the plate and a second fin surface extending parallel to and spaced from the first fin surface;
• and
• one or more pins protruding from the first fin surface of at least some of the fins, the pins extending away from the second fin surfaces,
• wherein a first distance from the second fin surfaces to an end of the pins removed from the first fin surfaces is less than or equal to a second distance from the second surface of the plate to the first surface thereof.