Quote:
Originally Posted by Figbash
Use it with a temperature controller to maintain the exact temperature you are looking for. I see no reason why it won't work on a glass carboy unless it's very narrow so it concentrates the heat to a small area. In that case just put a towel under it as already suggested. The one shown below covers a large area.
Tom

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That one looks like the brew blanket. The brew belt is actually very narrow. They sell them at my LHBS and the guy told me they cannot be used for more than 7 days straight. Unfortunately that doesn't help when you're trying to ferment in a cold space for 2-3 weeks.
For next winter I'm going with the aquarium heater and water bath route.