What is the Difference between the GC4 and GC2? Kelsey August 22, 2024 10:27 Updated The GC2 allows for 2 fermenters to be connected to the glycol chiller and the GC4 allows for 4.Download PDF at the bottom of the article, for all the GC2 and GC4 tech specs. GC2 and GC4 Specifications.pdf 200 KB Download Related articles What is the Difference between the GC2 and GC4? What is the maximum temperature the GC4 Glycol Chiller can be set to? Why is my GC4 flashing and beeping?