Once the boil is complete the next step is to quickly bring the temperature of the wort down to under 80 degrees Fahrenheit.  There are several reasons to do this as quickly as possible and each can have an impact on the quality of the finished product.  Rapidly cooling the wort can be accomplished in several different ways, some that don’t require any special equipment and others that do.  However you decide to cool down your wort remember to keep up good sanitation practices, you don’t want to ruin your beer this close to the finish line!

Benefits of a Rapid Cool Down

Depending on the volume of wort that you boiled it can take hours (or even longer) for the wort to cool down on its own.  During that extended period of time the conditions are just right for some type of unwanted bacteria or microorganism to gain a foothold in your wort.  By using some method of hastening the cool down you can greatly reduce the risk that your finely crafted wort will be infected.

Rapidly cooling the wort also gives you the opportunity to remove more unwanted proteins.  If the wort is cooled rapidly many of the proteins still in suspension will clump together and form what is knows as cold break.  Once the cold break proteins are heavy enough they will drop out of suspension and most of them can be left behind when the wort is moved into the fermentation vessel.  By removing as much of the cold break as possible, you can greatly reduce the haziness often found in chilled beers and can substantially improve the overall clarity of your brew.

Ways to Cool The Wort

Probably the easiest way to rapidly cool wort is to place the brew kettle into a cold water bath.  Depending on the size of your brew kettle this can be done in either a large sink or in a bathtub.  Fill the sink or tub up with cold water so that the water level on the outside of the kettle is roughly even with the wort on the inside.  You may need to drain and refill the water (particularly in a sink) if you notice it is becoming too warm.  You can also add ice to the sink or tub to speed the process up even more.  Keep the kettle in the water bath until the temperature is less than 80 degrees or until the outside of the kettle is cool to the touch.

If you have a large brew kettle and boiled 5 gallons of wort (or more) using the cold water bath will probably not be fast enough.  For larger volumes of wort the use of a wort chiller is an excellent way to quickly cool things down.  There are a few different types of wort chillers available to homebrewers, but probably the most common and most affordable is the immersion chiller.  Most immersion chillers are made of copper so that they conduct heat very well.  An immersion chiller works by being placed into the hot wort while cold water is ran through it from a faucet or garden hose.  The cold water runs through the chiller and is expelled through an outlet hose.  As the cold water continues to run through the immersion chiller the copper radiates out the coolness and the wort quickly cools down.  Immersion chillers are very easy to use and should be added to the boiling wort for the last 10 minutes or so of the boil to kill any bacteria or microorganisms that might be lurking on the copper.

There are other types of wort chillers available to homebrewers besides the immersion chillers.  Counterflow chillers and plate chillers are great products that quickly and efficiently bring down the temperature of the wort.  They both tend to be a little bit on the pricy side and take a little more work to keep clean.

No matter how you decide to cool down your wort as long as you get it done quickly and without introducing any contaminants you are getting closer to enjoying the (liquid) fruits of your labor!