Wort chiller

A wort chiller is a piece of equipment, most often an immersion coil or a plate-style unit, used to bring freshly boiled wort down from near boiling to pitching temperature in minutes rather than hours. Immersion chillers sit directly in the kettle with cold water running through an internal coil, while plate and counterflow chillers run hot wort and cold water through separate channels that exchange heat as the wort flows through.

Speed matters here for two reasons: wort sitting warm for a long time is more exposed to airborne contamination, and it can also produce a chill haze or unwanted flavor compounds if it cools too slowly through certain temperature ranges. A chiller that can drop a full batch to pitching temperature quickly reduces both risks and shortens brew day.

When choosing one, consider your typical batch size, your available cold water supply or need for a recirculating ice bath, and how easy the chiller is to clean and sanitize between uses, since it directly contacts finished wort. A common mistake is lowering an unsanitized chiller into wort right after the boil ends, when it should be sanitized beforehand, and another is underestimating how much cold water a coil chiller needs to work efficiently in warm weather.