I used my immersion chiller for the first time over Thanksgiving. I hear there are a couple of important temperatures to be concerned with, so I measured how long it took to get from one to the next. This is using MoreBeer’s Efficient Wort Chiller, 55°F ground water, and whirlpooling with a big ass stainless steel spoon, for 6 gallons of wort in a 10-gallon Blichmann BoilerMaker™ Brew Pot.
p>The upsot is that I got down to pitching temperature in just over 14 minutes.
Also, I drained the cooling water into a 5-gallon bucket. I had to empty it 6 times. So, it took about 30 gallons of water to do the cooling.