Heat transfer during reflux condensation inside an inclined micro-fin tube is studied. The highest heat transfer rate is obtained at 30° from the horizontal. Heat transfer at 30° inclination is 2.45 times better compared to vertical orientation. Heat transfer in a micro-fin tube is 120% higher than in a plain tube at 30° from the horizontal. Heat transfer is 34% higher in a micro-fin tube than in a rectangular channel at 30° from the horizontal.