by grapeadmin » Fri Dec 23, 2011 10:29 am
I am not sure that there is a hard and fast rule. Just make sure the the probe part will be submersed in the mash or wort. This depends on how many gallons of mash/wort you typically brew. I think mine is about 8-10 inches or so from the bottom of the kettle.
john
g and g