Can I do smaller batches than 30 L (8 US Gal) and still expect efficient heating/cooling from the GF30? Kim September 27, 2021 07:36 Updated When heating the contents of the fermenter, this will work with any amount of liquid as it heats from the bottom. Anything below 19 L (5 US Gal) for cooling won’t be as effective. Related articles Can I add fruit/other adjuncts directly to my fermenter? Can I bottle directly from my GF30? Video - How to Guide on Setting Up and Using the GF30 and Cooling Pump Kit How do I stop air getting sucked back into the airlock when I crash cool the Conical Fermenter? What are the minimum and maximum grain bills for the G30?