Mash Chiller for Grain-on Distillation 8 tube counterflow mash chiller – Ideal for use with 7bbl and smaller mash houses – 2″ external tubing with 1.5″ internal tubing – Mounted on 4″ casters for portability The effectivness of the mash chiller will be determined by various factors such as mash thickness, viscosity, water inlet temperature, etc. Mutliple cycles through the chiller will be required to reach desired temperature.