A heat exchanger for heat exchange between a first fluid and a second fluid is disclosed. The heat exchanger includes a first header-tank assembly and a second header-tank assembly. The heat exchanger is configured for operation in orientation in which the first header-tank assembly is substantially higher with respect to a ground level than the second header-tank assembly. The heat exchanger also includes a plurality of tubes arranged in a first stack and in a second stack. The stacks are arranged between the header-tank assemblies. The second stack is arranged downstream to the first stack with respect to a configured first fluid flow path. The heat exchanger also includes at least one fin interlaced between two adjacent tubes of each stack. The fin further includes a first section configured to deflect the first fluid substantially obliquely-upwardly.