Only have a cold basement or drafty closet to ferment your beer in? The Brewer's Best® / Vintner's Best® Brew Belt will help you heat to and maintain a constant brewing temperature of 68-75° F for all of your fermenting beverages (beer wort, wine must). Environments in your home may not be ideal for keeping your fermenter at the perfect temperature. The Brew Belt is here to help. It will maintain a constant temperature for up to 8 days. 15W. Comes with two spring sizes to fit most fermenters. Works best with buckets and other plastic fermentors. Not intended for use with glass, metal or wood fermentors. Please read and follow all instructions prior to use.