How Does a Thump Keg Work?

How Does a Thump Keg Work?


Are you a passionate distiller looking to take your craft to the next level? Look no further, because we have the perfect guide for you!

Welcome to Thumper Kegs 101, where we delve into the fascinating world of this essential distillation component.


Making your own moonshine can be quite a head-scratcher if you are new to this hobby. When you make your own alcohol you need to understand different processes such as fermentation and distillation.

Most new whiskey makers are all too familiar with the still because this is one of the most critical parts of the whiskey-making process. But one of the components you might not be as familiar with is the thump keg.

Thumper kegs are the secret ingredient that can elevate your distillation game to new heights, infusing your spirits with unique flavors and aromas that will leave friends and family begging for more shine.


The thump keg is called a thump keg because pieces of corn sometimes rise with the vaporized alcohol and will then make thump noises when it falls into this heated barrel.


In this comprehensive guide, we will explore everything you need to know about thumper kegs - from their history and purpose to the different types available in the market.

We will also provide expert tips and techniques to help you maximize the potential of your thumper keg, ensuring that every drop of liquid that passes through it is a masterpiece in itself.

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What is Moonshine?


Moonshine refers to homemade distilled spirits, typically containing a high alcohol content. Historically, moonshine was produced illegally to avoid taxes and regulations imposed on commercial alcohol.

Today, many people make their own moonshine as a hobby or for personal consumption. Moonshine is often made using a copper still kit, which enhances the distillation process and produces a superior quality of moonshine.


The use of copper in moonshine stills is crucial, as it helps remove impurities and enhances the flavor of the final product.


Copper's unique characteristic as a conductor of heat allows for efficient and precise distillation. Furthermore, copper is known for its ability to neutralize sulfur compounds, resulting in a smoother and more pleasant tasting moonshine.

What is a Thump Keg?



A thumper keg is an essential component of a distillation setup that plays a crucial role in enhancing the flavor and aroma of spirits.

It is a secondary chamber connected to the main still, where the distillate passes through before being collected.


The primary function of a thumper keg is to introduce additional ingredients, such as herbs, fruits, or spices, into the distillation process, creating a unique infusion that sets your spirits apart.


The thumper keg works on the principle of vapor infusion, where the rising steam from the main still interacts with the ingredients in the thumper keg, extracting their flavors and aromas.

This infusion process results in a more complex and layered spirit that tantalizes the taste buds and leaves a lasting impression.


Whether you're a seasoned distiller or just starting out, incorporating a thumper keg into your setup can take your craft to a whole new level.


The thump keg has been part of the whiskey-making process for a very long time. The main purpose of a thump keg is to distill your output of a pot still a second time without having to run the product through the still a second time or to alter the taste and potency of your moonshine.

You can produce a low-quality whiskey with just a pot and no thump keg. These spirits usually yield around 40 – 50% alcohol after a single run.

Those who want to create a high proof whiskey will then do a second run using the same product to increase the taste and quality of the still.

With a thump keg, you can create much higher quality still without having to go through the entire process all over again. The thump keg also eases the process because the still and thump keg setup will do all the work for you.

The Benefits of Using a Thumper Keg



The benefits of using a Thumper Keg in distillation are numerous. Firstly, it allows you to experiment with a wide range of flavors and ingredients, giving you the freedom to create spirits that are truly unique.


By adding herbs, fruits, or spices to the thumper keg, you can infuse your spirits with their essence, resulting in flavor profiles that are distinct and memorable.


Additionally, the thumper keg acts as a natural filter, removing impurities and unwanted elements from the distillate, resulting in a smoother and more refined spirit.

The vapor infusion process also allows for a more efficient extraction of flavors, as the rising steam interacts with the ingredients in the thumper keg, resulting in a more pronounced and well-balanced flavor profile.

With a thumper keg, you have the power to transform ordinary spirits into extraordinary creations.

The Design of a Thump Keg



Thump kegs do come in a variety of designs. Many whiskey makers prefer wooden barrel thump kegs because wood doesn't lose as much heat as quickly as metal thump kegs do. The temperature in the thump keg is just as important as in the main still.

In the still, the temperature rises and causes vaporization. Vapors rise through a copper tube into the thump keg where the vapors are reconverted into a liquid state.

The warmth of the thump keg causes the liquid to once again vaporize and escape through another copper tube that leads to the condenser. In the condenser, the vapor is cooled down and transforms back into a liquid state.

A Thump Keg can be Replaced with a Reflux Column Still

The thump keg can also be replaced by a reflux column still. These stills are filled with various materials such as copper mesh.

When the vapor passes through the column still, the liquid is processed and reacts with the copper to rid sulfur from the product.


Reflux column stills can produce a spirit with a 95% alcohol level.


Many do however prefer a thump keg above the reflux column still because thump kegs are easier to find or build and a lot cheaper to invest in.


Moonshiners also prefer to use a thump keg because the result tastes more like a quality whiskey where the product of a column still is often associated with the taste of vodka.


Some whiskey producers also prefer to leave out the thump keg and are happy to rerun the entire proses using a sour mash to maintain a specific alcohol percentage and a specific taste for their whiskey.

Thump kegs can be used to impact whiskey flavor


Another reason so many moonshine makers love to use a thump keg is because they can use the thump keg to modify the taste of the whiskey.


By adding certain ingredients such as fruits, herbs or spices, the taste and essence of the alcohol can be changed and more interesting spirits can be created.


How does a Thump Keg Work?



If you are using a thump keg for the first time then always remember to give it a good clean before using it so you can eliminate the chances of contaminating your still.

Once your thump keg is clean you can start putting together your setup. Here is a quick look at what you need;


  • Stillpot
  • Whiskey ingredients such as cornmeal, sugar, yeast, and water
  • Thump keg
  • Copper tubes
  • Condenser


Fully assemble your whiskey making kit before you start mixing ingredients. Many moonshiners build their own whiskey making kits complete with thump keg completely from scratch.

You can, however, save yourself a lot of time by simply buying the best whiskey making kit that is already fully constructed.

Once your setup is complete, you can start using your thump keg. Here are the steps on how to work this setup;

Make Your Mash



Before the product can reach the thump keg, a mash needs to be made in the still pot. In this process, cornmeal will be soaked in hot water inside the still.

Sugar is also sometimes added instead of grain. Yeast is then added to the mixture which starts the fermentation process.

This mixture takes a few days to fully transform into what is called mash.

The heat of about 172 degrees is then applied to the still so the alcohol can start to evaporate. This alcohol steam will then rise through the cap arm into copper pipes. In these copper pipes, the vapor is transferred into the thump keg.

Can you Add Fruit to a Thump Keg?

Some moonshiners choose to add specific ingredients such as fruits or spices to the thump keg. When the liquid mixes with these ingredients, some of the fragrance is absorbed into the liquid which alters the taste and aroma of the whiskey.

Can you Increase the Potency of your Still with the Thump Keg?

Moonshiners that want to create extra potent alcoholic beverages can choose to “charge” the thump keg by adding undistilled mash or alcohol to the keg. The steam that passes through the liquid will pick up some of the alcohol vapor before rising back up into the condenser.

The still in the heated thump keg will now begin to re-evaporate. This process also filters out all mash pieces that drifted along into the thump keg. The alcohol will now rise through a second copper tube where the vapors are cooled down in the condenser.

When the vapor escapes the thump keg, it rises into the condenser. The condenser is also called the worm because it consists of a length of coiled copper pipe inside a worm box that is filled with cold water.

Many worm boxes are fueled by constantly circulated cold water so the condensation process will remain constant.

When the vapor enters the worm, it is cooled down by surrounding cold water and the condensation process is instantly activated. The steam is transformed into liquid alcohol and exits the tap or hose or spout into a bucket.

Many moonshiners will also filter the moonshine one more time before bottling and selling their products.

Does a Thumper Need to be Heated?



Many moonshiners do prefer to heat the thumper. The alcohol does need to stay in vapor form to be able to rise into the condenser.

Wood barrels are often preferred as thump kegs because of wood's natural isolative abilities. Condensation in the thump keg is minimized and less artificial heat is required to vaporize the alcohol.

Different Types of Thumper Kegs and Their Features



Thumper kegs come in a variety of shapes and sizes, each with its own unique features and advantages.

The most common types include pot thumpers, thumper barrels, and thumper jars.



Pot thumpers are compact and versatile, making them ideal for small-scale distillers or those with limited space. They are typically placed directly on top of the still, allowing for a seamless integration into the distillation setup.

Thumper barrels, on the other hand, are larger and offer more capacity, making them suitable for distillers who produce spirits in larger quantities. These barrels are often equipped with a removable lid, making it easy to add or remove ingredients during the distillation process.

Thumper jars are another popular option, especially among distillers who prefer a more traditional setup. These glass jars not only add a touch of elegance to your distillation setup but also allow for easy monitoring of the infusion process.

Regardless of the type you choose, each thumper keg offers its own set of advantages, allowing you to find the perfect match for your distillation needs.

How to Set up a Thumper Keg in your Distillation Process



Setting up a thumper keg in your distillation process is relatively straightforward, but it requires careful consideration to ensure optimal performance.

The first step is to select a thumper keg that suits your needs and fits seamlessly into your existing setup.

Once you have chosen the thumper keg, it's time to connect it to the still. Depending on the type of thumper keg you have, this can be done by attaching it directly on top of the still or through a connecting pipe.


It's important to ensure a tight and secure connection to prevent any leaks or loss of vapor during the distillation process.


Once the thumper keg is connected, you can start adding your desired ingredients. Whether it's fresh herbs, fruits, or spices, the key is to choose high-quality ingredients that will impart the desired flavors and aromas to your spirits.

The amount of ingredients to add will depend on your personal preference and the intensity of flavor you wish to achieve. Remember to leave enough headspace in the thumper keg to allow for the expansion of vapor during the distillation process.

With the thumper keg set up and ingredients added, you're now ready to fire up your still and embark on a distillation journey like no other.

Thumper Keg Maintenance and Cleaning Tips




Proper maintenance and cleaning of your thumper keg are essential to ensure its longevity and optimal performance.

After each distillation run, it's important to clean the thumper keg thoroughly to remove any residue or impurities that may affect the flavor of your spirits.

Start by emptying the contents of the thumper keg and rinsing it with warm water to remove any remaining liquid.

Next, use a mild detergent or cleaning solution to scrub the interior of the thumper keg, paying close attention to any stubborn stains or buildup.

Rinse the thumper keg again with warm water to remove any traces of detergent.

Finally, allow the thumper keg to air dry completely before storing it. It's also a good idea to inspect the thumper keg regularly for any signs of wear and tear, such as cracks or leaks.


If any issues are detected, it's important to address them promptly to prevent any compromise in the distillation process.


By following these maintenance and cleaning tips, you can ensure that your thumper keg remains in top condition, ready to deliver exceptional spirits with every distillation run

Recipes and Techniques for Using a Thumper Keg



Now that you have your thumper keg set up and maintained, it's time to explore the endless possibilities it offers in terms of flavor infusion. Here are a few recipes and techniques to get you started:


  • Herbal Infusion: Add a handful of fresh herbs, such as rosemary or mint, to your thumper keg, and let the vapor infusion process work its magic. The result is a spirit with a refreshing herbal twist that complements a wide range of cocktails.
  • Fruit Infusion: Experiment with different fruits, such as berries or citrus, to create vibrant and fruity spirits. Simply chop the fruits and add them to the thumper keg, allowing the flavors to infuse into the distillate. The end result is a spirit bursting with natural fruit flavors.
  • Spiced Infusion: Elevate your spirits with a touch of spice by adding whole spices, such as cinnamon sticks or cloves, to the thumper keg. The steam will extract the essence of the spices, resulting in a spirit with warm and aromatic notes.


Remember, the key to successful flavor infusion is to use high-quality ingredients and experiment with different combinations to find your signature infusion. Don't be afraid to get creative and push the boundaries of flavor to create spirits that are truly exceptional.


Common Mistakes to Avoid when Using a Thumper Keg



While using a thumper keg can elevate your distillation game, there are a few common mistakes that you should avoid to ensure optimal results:


  • Overloading the Thumper Keg: Adding too many ingredients to the thumper keg can result in overpowering flavors and an unbalanced spirit. It's important to find the right balance and allow the flavors to shine through.
  • Neglecting Temperature ControlMaintaining the right temperature during the distillation process is crucial for flavor extraction. Make sure to monitor and adjust the temperature as needed to achieve the desired results.
  • Poor Quality Ingredients: Using low-quality ingredients will result in subpar spirits. Invest in high-quality herbs, fruits, and spices to ensure the best possible flavor infusion.
  • Neglecting Cleaning and Maintenance: Proper cleaning and maintenance of your thumper keg are essential for optimal performance. Neglecting these tasks can affect the flavor of your spirits and lead to potential issues down the line.


By avoiding these common mistakes, you can ensure that your thumper keg delivers exceptional results every time, allowing you to craft spirits that are truly remarkable.

Thumper Keg Accessories and Upgrades



To further enhance your distillation experience with a thumper keg, there are various accessories and upgrades available in the market. Some popular options include:


  • Temperature Control Systems: These systems allow you to precisely control and monitor the temperature during the distillation process, ensuring optimal flavor extraction.
  • Sight GlassesThese transparent tubes or windows allow you to visually monitor the infusion process inside the thumper keg, giving you greater control over the flavor extraction.
  • Customizable Inserts: Some thumper kegs offer customizable inserts that allow you to experiment with different infusion methods, such as perforated plates or mesh screens. These inserts can enhance flavor extraction and create unique spirits.
  • Upgraded Sealing Mechanisms: Upgrading the sealing mechanisms of your thumper keg can ensure a tight and secure connection, preventing any leaks or loss of vapor during the distillation process.


These accessories and upgrades can take your thumper keg to the next level, giving you more control and flexibility in creating spirits that are truly exceptional

Enhancing your Distillation Game with a Thumper Keg



Thumper kegs are a game-changer in the world of distillation, offering distillers the opportunity to create spirits that are truly exceptional.

From the vapor infusion process to the wide range of flavors and aromas that can be achieved, thumper kegs have revolutionized the distillation game.


By incorporating a thumper keg into your setup, you can unlock a world of possibilities and take your craft to new heights.


Remember to choose the right thumper keg for your needs, set it up properly, and experiment with different ingredients and infusion techniques.

With proper maintenance and cleaning, your thumper keg will continue to deliver exceptional spirits for years to come.

So, raise a glass to thumper kegs and the liquid that elevates your distillation game. Cheers to crafting spirits that leave a lasting impression!