Beer Info FAQ

What Gas Do I Use for Lager?

Lager fermentation is a crucial step in the brewing process that requires careful consideration of the type of gas used. The choice of gas can significantly impact the flavor, aroma, and overall quality of the final lager. In this article, we will explore the importance of using the right gas for lager fermentation and compare the different types of gases commonly used in the brewing industry.

Importance of Gas Selection

The gas used during lager fermentation serves multiple purposes. Firstly, it creates a protective layer on top of the beer, preventing oxygen from coming into contact with the liquid. Oxygen exposure can lead to off-flavors and spoilage, compromising the quality of the lager. Secondly, the gas helps to maintain consistent pressure within the fermentation vessel, allowing for proper carbonation and conditioning of the beer. Lastly, the choice of gas can influence the mouthfeel and perceived carbonation levels in the final product.

Types of Gases for Lager Fermentation

  1. Carbon Dioxide (CO2): Carbon dioxide is the most commonly used gas for lager fermentation. It is produced naturally during the fermentation process and can be captured and reused. CO2 provides a neutral flavor profile and is essential for achieving the desired carbonation levels in the lager. It is readily available in compressed gas cylinders and is relatively affordable.

  2. Nitrogen (N2): Nitrogen is another gas option for lager fermentation, although it is less commonly used compared to CO2. Nitrogen produces smaller bubbles and imparts a smoother mouthfeel to the beer. It is often used in nitrogenated beers, such as stouts and porters, to create a creamy texture. However, for traditional lagers, nitrogen is not typically the preferred choice due to its impact on carbonation levels and flavor perception.

Gas Comparison and Considerations

When deciding between carbon dioxide and nitrogen for lager fermentation, several factors should be considered:

  • Flavor and Mouthfeel: Carbon dioxide provides a more traditional flavor profile and carbonation levels suitable for lagers. Nitrogen, on the other hand, can alter the mouthfeel and may not be ideal for achieving the desired crispness in a lager.

  • Availability and Cost: Carbon dioxide is widely available and relatively affordable, making it the more practical choice for most homebrewers. Nitrogen may require specialized equipment and can be more expensive to obtain.

  • Beer Style and Preference: Consider the specific lager style you are brewing and the desired characteristics. While carbon dioxide is the standard choice, some brewers may experiment with nitrogen for unique flavor profiles or to mimic certain beer styles.


Choosing the right gas for lager fermentation is crucial for achieving the desired flavor, carbonation, and overall quality of the beer. Carbon dioxide is the most commonly used gas due to its availability, affordability, and compatibility with traditional lager styles. Nitrogen, although less common, can be used for specific beer styles or to create unique mouthfeel characteristics. Ultimately, the choice of gas should align with the desired flavor profile and brewing goals.

Frequently Asked Questions

Q: Can I use a combination of carbon dioxide and nitrogen for lager fermentation? A: While it is possible to use a combination of gases, it is generally not recommended for lager fermentation. The different properties of carbon dioxide and nitrogen can affect carbonation levels and flavor perception, potentially compromising the quality of the lager.

Q: Can I naturally carbonate my lager without using gas? A: Yes, it is possible to naturally carbonate lagers by allowing the beer to ferment in a sealed container, trapping the carbon dioxide produced during fermentation. However, this method requires careful monitoring and may result in inconsistent carbonation levels.

Q: How do I know if I have the right carbonation levels in my lager? A: The ideal carbonation levels for lagers can vary depending on the specific style and personal preference. It is recommended to refer to style guidelines or use a carbonation calculator to determine the appropriate amount of carbonation for your lager.

Q: Can I use other gases, such as helium or argon, for lager fermentation? A: No, gases like helium or argon should not be used for lager fermentation. These gases do not provide the necessary properties for proper fermentation and can negatively impact the flavor and quality of the beer.

Q: How should I store gas cylinders for lager fermentation? A: Gas cylinders should be stored in a cool, dry, and well-ventilated area away from direct sunlight and heat sources. It is important to follow the manufacturer's guidelines for safe storage and handling of gas cylinders.

Remember, the choice of gas for lager fermentation should be based on the desired flavor profile, availability, and brewing goals. Experimentation and personal preference can play a role in selecting the right gas, but it is essential to consider the impact on carbonation levels and overall quality of the lager.