I'm looking for information on the largest non heated or cooled tank that can be used for fermenting a molasses wash. I'm in the process of sourcing equipment for a new distillery and am curious about others experiences. I was planning on using 55 gallon drums based on information from the book The Distillers Guide to Rum. The book states that any tank over 55 gallons will generate too much heat and will kill the yeast early. However, I've visited plenty of Whiskey distilleries that were fermenting in 300 gallon non heated or cooled tanks without issues. My hope is to use 300 hundred gallon tanks as our still can accommodate 350 gallons of wash. Can anyone offer any advice or experience with fermenting in larger tanks?