VHS-6-ASY-120V Diffusion Pumps Overview New Varian Style Diffusion Pump Heaters Product Detail (Click to Enlarge) Overview Varian Model VHS-6/VHS-250 DP Replacement Stovetop Heater, Full Assembly 120V/2200W/18.3A. Discontinued. See platen heaters. Order Part This product is no longer available.