The Benefits of Safale S-04 English Ale Dry Yeast

S-04 , also known as Safale S-04 English Dry Yeast, is a popular choice among brewers, particularly for cask ales. With its British origin and unique characteristics, S-04 yeast offers a range of benefits that make it a valuable addition to your brewing arsenal.

One of the standout features of S-04 yeast is its high flocculation rate. Flocculation refers to the tendency of yeast cells to clump together and settle at the bottom of the fermentation vessel. In the case of S-04 yeast, this process occurs quickly, allowing for a rapid settling of yeast after the is racked into a cask. This is especially important in commercial brewery settings, where time is of the essence and a clear beer is desired.

In terms of tolerance, S-04 yeast can handle a relatively high range, typically between 9 and 11%. This makes it suitable for a variety of beer styles, including stronger ales. Whether you're brewing a traditional English or a robust barleywine, S-04 yeast can handle the task.

When it comes to flavor profile, S-04 yeast imparts fruity and floral notes to your beer. This can add complexity and depth to your brew, enhancing the overall sensory experience for the drinker. These flavors are often described as being reminiscent of stone fruits, such as apricot or peach, as well as floral elements like lavender or rose. The specific flavors produced can vary depending on the fermentation temperature and other factors, so experimentation is encouraged to find the perfect balance for your desired beer style.

Another advantage of S-04 yeast is its ability to sediment nicely, resulting in a clearer beer after fermentation is complete. This is particularly useful for cask ales, where clarity is important for presentation and serving. With S-04 yeast, you can achieve a bright and visually appealing beer that is sure to impress.

In terms of fermentation temperature, S-04 yeast thrives in a range of 54 to 77°F, with an ideal range of 59 to 68ºF. It is important to note that different temperature ranges can result in different flavor profiles, so it is worth experimenting to find the optimal temperature for your specific beer.

In comparison to other English yeast strains, S-04 yeast is often recommended as a dry equivalent to Fuller's Brewery's A09 Pub yeast. Both strains have their own unique characteristics, but S-04 yeast offers a convenient and reliable option for homebrewers looking to recreate traditional English ales.

S-04 yeast is a versatile and reliable choice for brewers looking to create authentic English ales. Its high flocculation rate, alcohol tolerance, and distinctive flavor profile make it a favorite among both commercial and homebrewers. Whether you're brewing a classic bitter, a robust porter, or any other English-style ale, S-04 yeast is sure to deliver excellent results. So go ahead, give it a try and see how this exceptional yeast strain can elevate your brewing game.

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What Is S-04 Yeast?

S-04 yeast, also known as S-04 strain, is a type of yeast that originated in Britain. It is highly flocculent, which means that it has a strong tendency to clump together and settle at the bottom of the fermentation vessel. This characteristic is particularly desirable in commercial brewery settings, where the yeast needs to settle quickly after the beer is racked in a cask.

One of the key advantages of S-04 yeast is its ability to produce a rapid fermentation process. This means that the yeast can quickly convert the sugars in the beer into alcohol and carbon dioxide. As a result, the brewing time is reduced, allowing brewers to produce their beers at a faster rate.

In addition to its flocculation and fermentation speed, S-04 yeast also imparts certain flavor characteristics to the beer. It is known for producing a clean and crisp profile, with subtle fruity esters and a mild earthy or spicy note. These flavor nuances can enhance the overall taste of the beer, adding complexity and depth to the final product.

To summarize, S-04 yeast is a British strain known for its high flocculation and fast fermentation times. Its ability to settle quickly after racking makes it ideal for brewing cask ales in commercial breweries. The yeast also contributes to the flavor profile of the beer, adding subtle fruit

What Temperature Is High For S-04 Yeast?

The high temperature range for Safale S-04 English Ale Dry Yeast is 77°F. However, it is important to note that the ideal temperature range for this yeast strain is between 59 – 68ºF. At these temperatures, the yeast will thrive and produce the desired fruity and floral notes in your beer. It is recommended to ferment within this temperature range to ensure optimal results.

If the fermentation temperature exceeds 77°F, it may lead to some undesirable effects. The yeast may become too active and produce off-flavors in the beer. Additionally, higher temperatures can also cause the yeast to work too quickly, resulting in incomplete fermentation or a beer with a higher alcohol content than intended.

To summarize, while S-04 yeast can tolerate temperatures up to 77°F, it is advisable to ferment within the ideal range of 59 – 68ºF to achieve the best flavor profile and avoid any potential issues.


Safale S-04 English Ale Dry Yeast is a highly versatile yeast strain that is widely used in the brewing industry, particularly for brewing cask ales. With its high flocculation and quick fermentation times, it is ideal for commercial breweries where settling yeast quickly is essential. This strain has a decent alcohol tolerance of 9-11% and produces fruity and floral notes in the beer. Additionally, S-04 sediments nicely, resulting in clearer beer after fermentation is complete. It thrives in a temperature range of 54 – 77°F, with the ideal range being 59 – 68ºF. S-04 yeast is a reliable and popular choice for brewers looking to achieve consistent and flavorful English-style ales.

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Thomas Ashford

Thomas Ashford is a highly educated brewer with years of experience in the industry. He has a Bachelor Degree in Chemistry and a Master Degree in Brewing Science. He is also BJCP Certified Beer Judge. Tom has worked hard to become one of the most experienced brewers in the industry. He has experience monitoring brewhouse and cellaring operations, coordinating brewhouse projects, and optimizing brewery operations for maximum efficiency. He is also familiar mixology and an experienced sommelier. Tom is an expert organizer of beer festivals, wine tastings, and brewery tours.