This 40 watt heater wraps around carboys and fermenters, and provides even heating. Tape it in place or put it underneath an insulated jacket. Provides 40 watts spread out over 2 square feet. 11" high, and 25" wide. 110 volts and 40 watts.
For more precise results, we recommend using this in conjunction with a temperature control like the KegLand Dual Plug Control.