An evaporator comprising: two first plates (12, 12a, 12b), each having a first configuration, engaged in a back to back mirrored relationship to one another to form a first pair (14, 14a) with a first cavity defined between said two first plates (12, 12a, 12b); two second plates (16, 16a, 16b), each having a second configuration, engaged in a back to back mirrored relationship to one another to form a second pair (18, 18a), with a second cavity defined between said two second plates (16, 16a, 16b); wherein said first pair of plates (14, 14a) and said second pair of plates (18, 18a) are stacked together; an inlet manifold (66, 96) defined in said first and second pairs of plates (14, 14a, 18, 18a) for receiving the fluid to be evaporated, said inlet manifold (66, 96) in communication with only said first cavity relative to said first and second cavities (24, 38) for directing the fluid through said evaporator in a first direction; a return tank defined in said first and second pairs of plates (14, 14a, 18, 18a) opposite said inlet manifold (66, 96), said return tank in communication with said first cavity for receiving the fluid from said first cavity and in communication with said second cavity for directing the fluid through said evaporator in a second direction opposite said first direction; and an outlet manifold defined in said first and second pairs of plates (14, 14a, 18, 18a) opposite said return tank and adjacent said inlet manifold (66, 96), said outlet manifold in communication with only said second cavity relative to said first and second cavities (24, 38) for evacuating the fluid from said second cavity out of said evaporator. two first plates (12, 12a, 12b), each having a first configuration, engaged in a back to back mirrored relationship to one another to form a first pair (14, 14a) with a first cavity defined between said two first plates (12, 12a, 12b); two second plates (16, 16a, 16b), each having a second configuration, engaged in a back to back mirrored relationship to one another to form a second pair (18, 18a), with a second cavity defined between said two second plates (16, 16a, 16b); wherein said first pair of plates (14, 14a) and said second pair of plates (18, 18a) are stacked together; an inlet manifold (66, 96) defined in said first and second pairs of plates (14, 14a, 18, 18a) for receiving the fluid to be evaporated, said inlet manifold (66, 96) in communication with only said first cavity relative to said first and second cavities (24, 38) for directing the fluid through said evaporator in a first direction; a return tank defined in said first and second pairs of plates (14, 14a, 18, 18a) opposite said inlet manifold (66, 96), said return tank in communication with said first cavity for receiving the fluid from said first cavity and in communication with said second cavity for directing the fluid through said evaporator in a second direction opposite said first direction; and an outlet manifold defined in said first and second pairs of plates (14, 14a, 18, 18a) opposite said return tank and adjacent said inlet manifold (66, 96), said outlet manifold in communication with only said second cavity relative to said first and second cavities (24, 38) for evacuating the fluid from said second cavity out of said evaporator.