If using carboy or bucket you can attach directly using tape (as seen in photo above.) We recommend electrical tape as it sticks and unsticks the easiest. Heating can be contolled by sticking either the entire wrap or a portion of the wrapto the fermenter. In an unenclosed evironment we see a heating differential between carboy and ambient of 10-15 degrees. This differential can be increased by using our carboy bag to insulate a carboy To decrease the temperature differential stick only a portion of the heating wrap to the fermenter. With 40 watts of heat spread over two square feet it provides gentle even heating. Draws 40 watts. 115V. Manufactured by Fermentap.