A new generation of Water Cooled Screw Chillers using Flooded Evaporators are added to the present range of R134a based Screw Chillers. The Chillers are highly energy efficient, robust in construction. These chillers are developed with state of art technology which includes R134a optimized Hanbell screw compressors specially developed for flooded chiller technology, high efficiency flooded coolers and water cooled condensers. The latest generation high efficiency; doubly enhanced copper tubes are incorporated in both coolers and condensers. Electronic expansion valves and the new generation MCS Magnum Controllers are also incorporated. The units have very low input KW/TR.