Fermentation Heater Carboy Warmer - Kombucha Heating Wrap with Thermostat for Temperature Control - Electric Heat Pad Belt for Home Fermenting & Brewing - Fits Most Fermenter Vessels 2 to 8 Gallons is up for auction in Home & Kitchen. The current bid is $1.00, 98% below the $54.98 MSRP, in Good Condition. This auction has ended — similar items appear in live auctions regularly.