The Brew Belt Fermentation Heater
The Brew Belt helps to maintain minimum fermenting temperatures between 68 and 75 degree F in cold rooms or basements. Fits 5, 6, or 7.9 gallon plastic buckets and 3, 5, and 6 gallon Better Bottles. Although the Brew Belt will also fit 3, 5, 6 and 6.5 gallon glass carboys, the manufacturer does not recommend using it with glass fermenters, although we use it all the time on glass carboys without problems. If your glass carboy has a hairline crack, it's going to break anyhow. Inspect glass carboys before each use!