An experimental study was performed for the boiling heat transfer enhancement of water/salt mixtures on both plane and roll-worked enhanced tubes in compact staggered tube-bundle evaporators under atmospheric and increased pressure conditions. The effects of tube spacing, position of tubes, test pressure and salt-water concentration on the boiling heat transfer characteristics in restricted spaces of compact tube bundles consisting of plane and roll-worked tubes were investigated. The experimental results indicate that the single roll-worked tubes in a bulk liquid have a greater boiling heat transfer promotion than the single plane tubes. For the plane tubes in compact tube bundles, the effect of tube spacing on the boiling heat transfer is very significant. The boiling heat transfer has a maximum enhancement when the optimum tube spacing is selected. For the roll-worked tubes in compact bundles, the effect of tube spacing on the boiling heat transfer is also significant as the tube spacing is small. The boiling heat transfer still has a maximum value and a compound enhancement effect of the boiling heat transfer from both the optimum tube spacing and the surface treatment is observed for the enhanced tube bundles.