Brew Belt Fermentation Heating Belt. The Brew Belt is an adjustable heating belt that wraps around a 6-6.5 gallon (23 L) plastic fermenter. It will maintain at a constant brewing temperature of 75-80 deg F. up to 8 days. Brewing in cold or damp conditions often requires this additional heat source to maintain minimum fermentation temperatures., Brewers Best/Vintners Best Brew Belt, Package Contains 1-Count of Brew Belt Fermentation Heating Belt, An Adjustable Heating Belt that Wraps Around a 6-6.5 Gallon (23 L) Plastic Fermenter, Country of origin - United States, Manufacturer name - Home Brew Ohio.