Why are in-line coolers not suitable for cask ales?

In-line coolers are not suitable for cask ales primarily because they disrupt temperature stability. Cask ales are traditionally served at cellar temperature, which is typically around 50-55°F (10-13°C). In-line coolers rapidly cool the beer as it is dispensed, which can lead to significant fluctuations in temperature. This instability can negatively affect the flavor profile and mouthfeel of the cask ale, which relies on serving conditions that maintain its intended temperature.

Cask ales are also unfiltered and typically served without additional carbonation, which means that maintaining the original character of the beer is crucial. The use of in-line coolers, with their potential for rapid temperature changes, can cause unwanted effects such as the release of volatile aromatics and subtle flavors that are essential to the experience of a well-kept cask ale.

Maintaining a consistent temperature is key to preserving the traditional qualities of cask ales, which is why other methods such as jacket cooling or cellar storage are preferred for serving them. These methods ensure that the beer remains at an ideal temperature throughout the serving process, allowing drinkers to enjoy the full spectrum of the beer's characteristics.