Check the listing for details. Fermentaholics Heat Mat - Keep Your SCOBY in The Proper Temperature Range. Condition: New. Listed at 16.95 USD. The ideal temperature range of kombucha is between 24 and 29° Celsius. If your house is cooler than this temperature range, you will want to consider using a heater to get maintain the proper temperature. This heat mat fits most sized vessels. Has a standard 110 volt plug so an adapter is necessary to plug into 220 volt outlets.★ SAFE, EFFECTIVE HEATING ★ Offers efficient heating for your kombucha brewing vessel. Ideal temperature range for kombucha is between 75° and 85° F★ MAKE PERFECT KOMBUCHA ★ Fermenting at too low of a temperature is the #1 mistake new kombucha brewers make. Don’t let this be you!★ ADHESIVE THERMOMETER INCLUDED ★ Monitor the fermentation temperature by adhering the provided thermometer to the side of the brew vessel and adjust the position of the mat if needed.★ EASY TO USE ★ Instructions are printed right on the heater—no chance of loosing them! Just plug it in and start raising the temperature of your kombucha between 5° and 20° F over ambient temperature. Vary the strength by adjusting the heater's placement.★ FERMENTATION FRIEND ★ While this works great for kombucha, it also works for your other home fermentations that need a little temperature boost such as kefir, sourdough, sauerkraut, kimchi, tempeh, etc!