3 models to choose from- VSE, VSS, VSS-T High and Low Velocity 5-30 gph Electric or Steam Heated 5-100 gph Steam Heated Fully Automatic Controls 316L Electropolished Condenser and Distillate Piping CGMP Vent System No dead legs, completely drainable Condenser on Thermevap models Sanitary Orbital Welding on Distillate Piping Low Maintenance