Originally Posted by BetterSense
What's the point of that? I've never heard of a whirlpool tube. What do you do with it?
A couple of things: One, if you use an immersion chiller, recycling the wort significantly reduces the time it takes to bring the boiling wort down to pitching temperature. Two, whirlpooling in the BK at the end of the chill cycle will build a nice cone of trub in the middle of the kettle, and if your drain draws from the edge, you can leave all that goop behind instead of it ending up in your fermenter.
And if it isn't clear, a pump is required to make that all work...