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Old 03-11-2010, 11:08 PM   #1
Jul 2009
Mission Viejo,CA
Posts: 192

I'm building my temperature controlled fermentation chamber (rubbermaid tub with a aquarium heater) and I was wondering . . if I put the primary into the tub and set the temp at 69F (This is a Wheat beer with a belgian yeast) will the temperature inside the fermenter (glass carboy) be the same as the temp of the water outside? I plan on filling the water on the outside up to about the 3 - 4 gallon mark of the carboy.

I ask because I want to keep my beers at a specific temperature! As close as possible at least, with the least amount of change.

I know a few of you out there currently use this method. . what say you?

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Old 03-11-2010, 11:12 PM   #2
Ale's What Cures You!
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Jun 2006
UP of Michigan, Winter Texan
Posts: 69,998
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Yes, generally the water is about the same temperature as the beer. If you add more water, the temperature will be even closer. That much water insulates the fermenter pretty well.
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