Distillation

Distillation separates alcohol and other volatile compounds from the fermented liquid called wash, then condenses the vapour back into liquid. Fermentation has already made the alcohol: the still’s role is separation, while its design and the way it is used help shape the character of the resulting spirit.[1][3]

This hub follows that journey through the still house, from the choice of equipment to the spirit collected for maturation. Its guides separate questions that are often bundled together: how a still works, how its shape matters, what the distiller collects and what returns for another distillation.

Start here if you are new

Begin with how whisky is distilled for the relationship between fermentation, evaporation and condensation. It provides the vocabulary needed for the equipment guides without making the machinery the starting point.

Next, read pot stills explained, followed by column stills and the Coffey still. Read them together to establish the distinction between batch and continuous distillation before exploring the variations within each approach.[2]

There is no need to read every technical guide in sequence. If you already understand the basic process, choose the section below that matches your question: equipment, heating, repeated distillation, flavour or the collection of new make spirit.

Distillation guides

Understand the separation

The useful starting point is not a particular still shape, but what distillation does to fermented liquid. HMRC describes partial evaporation followed by condensation, with the condensate holding the more volatile components, including alcohol.[1]

How Whisky Is Distilled explains that separation and keeps it distinct from fermentation. HMRC describes the wash as resembling a strong flat beer, giving 6 to 8% ABV in its account; this is a description of the fermented starting material, not a strength created by the still.[1]

Read this guide when you want to connect the stages rather than memorise equipment names. It is also the place to establish what wash and condensate mean before meeting low wines, feints and the spirit cut in the more specialised articles.

Distillation Strength and Congeners Explained takes the next step: what travels with the alcohol? The Scotch Whisky Technical File describes distillation as separating alcohol and other congeners from wash, and notes that some volatile substances can interact during distillation to form new congeners.[3]

Congeners are aroma compounds, rather than another name for alcohol alone. Read this guide when a discussion of strength leaves you wanting to know more about character: it connects the separation process with the compounds carried into the distillate, without treating ABV as a complete description of the spirit.[3]

Choose the equipment question

Pot, column and hybrid stills are useful categories, but they answer different questions about how equipment is arranged and used. Start with the broad designs, then move to the particular feature you want to understand.

Pot Stills Explained begins with a straightforward description from the Oxford Companion: a pot in which liquid is heated and a cover that catches the resulting vapour. Whisky pot stills then use a separate condenser or worm to turn that vapour back into liquid.[2][4]

Read it to understand the relationship between the vessel, its upper sections and the condenser. That foundation makes the later guides on still shape and copper contact easier to follow, because those articles examine parts of a system rather than isolated pieces of copper.

Column Stills and the Coffey Still introduces equipment developed for continuous rather than batch distillation. HMRC describes an arrangement with two columns, the analyser and rectifier, divided into compartments by plates; its broad comparison assigns them the roles of the wash still and low wines still respectively.[1][2]

This is the guide for understanding what changes when distillation becomes a continuous operation. It also connects the terms Patent Still and Coffey Still, both used in the Scotch Whisky Association’s 1995 description of grain whisky production.[4]

Lomond Stills and Hybrid Stills is the next stop when the equipment does not fit a simple pot or column description. The Oxford Companion defines a hybrid as a pot still with a rectification column attached, commonly containing copper plates that influence the movement of vapour and returning liquid.[2]

Read it for the adjustable arrangement: most hybrids allow plates to be switched on or off, while some allow the column to be bypassed. Those features provide a more useful starting point than assuming every still with both a pot and plates operates in the same way.[2]

Follow the heat and the repeated distillations

Once the equipment is familiar, follow what happens to the liquid. Heating, collecting and redistilling are related stages, but each deserves its own explanation.

Direct Fired vs Steam Heated Stills examines how heat reaches the still’s contents. Still house engineer Briggs of Burton groups heating systems into direct firing, internal heating through coils or pans, and external heating through heat exchangers.[5]

Read this comparison to distinguish the heat source from the still’s overall design. Its engineering framework is particularly useful when a production description mentions steam or direct firing without explaining where the heating surface sits; the equipment maker’s figures belong to that account, not to every distillery.[5]

Double and Triple Distillation addresses the number and sequence of distillations. Read it to understand how successive distillations fit together.

Use this guide when a production account gives a distillation count but leaves the route through the still house unclear. It belongs before the detailed guide to recycled fractions: first establish the sequence, then look at which liquids move forward and which return.

Low Wines and Feints: How Whisky Is Redistilled follows liquids between collections and subsequent distillations. Read it to understand how the returning streams fit into the process.

Read it when the process seems less like a straight line than the introductory diagram suggested. Its particular task is to make the returning streams understandable, so that the number of distillations and the movement of material are not mistaken for the same question.

Connect equipment with spirit character

The Scotch Whisky Technical File identifies still design, distillation rate, copper contact and the fractions collected as factors shaping the distillate.[3] These guides divide that broad explanation into manageable questions, rather than attributing character to one feature alone.

Still Shape and Size: How They Shape Flavour examines the vessel itself. The Technical File states that different still shapes lead to differences in the flavour of the Scotch whiskies produced; the Scotch Whisky Association also describes taller stills as often producing a lighter character.[3][7]

Read this article to understand why still dimensions appear in production descriptions. The word “often” matters: the association presents a tendency, while the wider technical account names several interacting factors, not a rule that lets height alone predict the finished spirit.[3][7]

Reflux and Copper Contact: Lyne Arms, Boil Balls and Purifiers moves the focus to the vapour’s route and its contact with copper. The Technical File describes vapours rising through the neck and over the still head before reaching the condenser, while identifying copper contact among the factors shaping the distillate.[3]

Choose this guide when you can identify a still’s outline but want to understand the technical discussion around its upper sections. Read it alongside the shape guide: one concerns the vessel’s design, while the other gives closer attention to the journey through that design.

Worm Tubs vs Shell and Tube Condensers: Why Some Distilleries Keep the Coils follows the vapour to the point where it becomes liquid again. Trade accounts identify worm tubs and shell and tube condensers as the two condenser types used by Scotch malt distilleries.[8]

Read this comparison when a distillery description makes a feature of its condenser. The worm tub account describes a continuation of the lyne arm that coils through cold water; placing that equipment after the still in your mental picture helps connect condensation with the preceding discussion of copper contact.[8]

Understand what is collected

The last part of the route concerns selection. The guides below explain the distinction between the fractions collected and the spirit prepared for maturation.

The Cut: Heads, Hearts and Tails concentrates on selection during the second distillation. Read it for the distinction between the first, middle and final fractions.

Read it when you want to understand what a distiller means by making the cut. It complements the low wines and feints guide without doing the same job: that article follows the returning liquids, while this one centres on the fraction retained for maturation.

New Make Spirit: Straight From the Still brings the sequence to the spirit before cask filling. The Scotch Whisky Technical File uses the term new make spirit for both malt and grain spirit, and describes normal dilution with water before filling to a strength between 60 and 70% ABV.[3]

Choose this guide to distinguish collection from preparation for maturation. The SWRI and Abertay review describes a spirit cut around 70% ABV, whereas the Technical File’s filling range concerns the subsequent preparation of new make; those figures describe different points in the process.[3][6]

Build a reading route around your question

For an equipment question, take pot stills or column stills first, then heating, shape and condensers. That route moves from the overall arrangement towards individual features, keeping each component connected to its place in the process.

For a question about what reaches the cask, take double and triple distillation, low wines and feints, the cut, then new make spirit. Finish with distillation strength and congeners if you want to connect the movement and selection of liquid with the compounds it carries.

For flavour, read still shape alongside reflux and copper contact, then return to the cut. The Technical File places design, rate, copper contact and collected fractions together; following those connections is more useful than looking for one piece of equipment that explains the spirit on its own.[3]

Sources

The source entries require complete bibliographic details and verification before publication. The references in the brief are specific to each article and must be matched to the underlying documents.

1. HMRC, whisky production and distillation guidance extracts supplied in the brief. Document titles, editions and publication years not supplied.
2. Oxford Companion, entries on pot stills, column stills and hybrid stills, including the hybrid entry attributed to Bill Owens and Andrew Faulkner. Full bibliographic details not supplied.
3. Scotch Whisky Technical File, June 2019. Extracts on distillation, still design, collection and preparation for maturation.
4. Scotch Whisky Association, 1995 publication extracts on malt and grain whisky distillation. Document title not supplied.
5. Briggs of Burton, still house heating systems account. Document title, edition and publication year not supplied.
6. Scotch Whisky Research Institute and Abertay, review extracts on distillation and spirit collection. Authors, article title, journal and publication year not supplied.
7. Scotch Whisky Association, account of still size, shape and spirit character. Document title and publication year not supplied.
8. Trade sources, condenser accounts supplied under A443, references [4] and [5]. Publishers, document titles and publication dates not supplied.

This hub was prepared as desk research from the editor-supplied verified extracts, without independent source retrieval, a distillery visit or a tasting.

Last checked: November 2026