Questions & Answers (1)!


We had a successful Drinktec 2022 in Munich. Hundreds of brewers and distillers visited our booth, asked questions, and expressed their interest in our disruptive technology. But what did they ask? What were the questions on their mind, as they saw the iStills? In a series of posts called “Questions & Answers” we will summarize the questions that were asked most as well as our answers.

Question 1

Why are your boilers square instead of round?


Depending on the type of spirit you produce, agitation is needed, so that the boiler contents are well-mixed. In a round boiler the boiler contents will start to move with the agitator system. As the speed differential between the agitator and the boiler contents drops, so does the actual mixing energy that is applied. Therefore, mixing in a round boiler is not very effective and the goal of optimal dispersal of grains or herbs or grapes is not achieved.

As a result, still manufacturers, that do add agitators to round boilers, often have to resort to over-mixing the boiler contents. The now very fast turning agitator throws boiler contents into the gas bed above the liquid bath. This disruption of the gas bed, from which the riser or column harvests its gasses, leads to fluctuations in vapor speeds in that riser or column, hampering flavor consistency and cuts management. Boiler and agitator longevity will be comprised too, as both are over-worked in order to create a higher degree of mixing.

Also, as the boiler contents start to move with the agitator – in a round boiler – a vortex is created. The vortex sucks gasses downwards, competing with the riser or column. This interferes with the riser or column doing its work properly. As with over-agitating the boiler contents, a vortex hampers production speed as well as flavor consistency and cuts management. What essentially happens, in both cases, is that micro burst of over- and under-pressure influence the vapor speeds inside the distillation system, resulting in unwanted smearing of heads and tails flavors into hearts.

The vortex has a secondary negative effect. As the vortex reaches downwards, more boiler contents are pushed upwards, via the sides of the boiler, limiting the fill-grade of that boiler. Especially in combination with over-mixing, this can result in a big difference in gross vs. net boiler capacity. In a round boiler with a gross content of 650 liters, the maximum net filling will be 350 to 400 liters only. The choice for a round boiler severely limits your production capacity, as you have to do more yet smaller runs.

How a square boiler with flush corners helps? Well, first of all the boiler contents cannot start to spin with the agitator. The moment the wash start to move with the agitator, the corners – that are further away – generate a counter rotational movement, keeping the boiler contents in place and thus maximizing the speed differential between agitator and wash. As a result all the energy put in by the agitator translates into actual mixing and perfect particle distribution.

Since no vortex is created – in a flush-square boiler, that is – and no over-mixing needs to take place, the gas bed above the boiler contents is very stable. The riser and column can do their work under optimal conditions, which results in higher production rates, better quality spirits, and recipes that are reproducible from one run to another.

Finally, our 630 liter gross capacity iStill 500 has a net fill rate of 500 liters. That’s about 30% more than an equally sized round boiler. The benefit? You get more still for your buck. You can process bigger batches. Your yield – and therefore your income – is significantly increased.


What reactions did we get, when answering the question of why we have flush-square boilers? The reactions ranged from “that makes total sense” to people being flabbergasted.

At your service!

The iStill Team

Square boilers matter …

Why Brewers Buy iStills!


More and more craft brewers buy iStills. Why? Well, the short answer is simply this: because they want to add distilled beverages to their product portfolio.

That’s the short answer. But why do they choose iStill? We spoke to some of our craft brewing customers and here are the top answers they gave.

Process control

“As a brewer, whenever I brew a new style of beer and it is a success, I want to be able to reproduce that beer exactly. That’s why – in the brewery – we invested heavily in process control. Control leads to reproducible outcomes and the same quality beer. What attracted me in iStill is your focus on process control. It allows me to make spirits very much the same way I make beers: in a reproducible manner.”

Stainless steel

“Our brewhouse is stainless steel. It is low maintenance and lasts like forever. That makes it a good material to invest in. iStills were the first stills we saw that were also made from stainless steel. It made total sense for us to choose iStill.”


“When our team wanted to learn about distilling, well, it was as if we ran into a brick wall. Nobody could tell us anything, unless we hired expensive consultants. With iStill you don’t just buy a still. You also become a member of a community where distillers help each other out. Moreover, our experience with the iStill Team and the support they deliver, has been excellent! Very helpful and explanatory”


“In our brewery I took on distilling. What I liked was the education and courses iStill offers. Not only did I make friends for life, also I learned how to distill whiskey, rum, gin, and vodka to perfection. When the iStill arrived I was ready for it.”

Are you a craft brewer interested in distilling?

Reach out to us so we can discuss how we can be of assistance to you realizing your plans!

Huge Discount Opportunity for American Distillers!

The gist of it

The current macro-economic environment creates a big opportunity for American distillers. As the Euro has become cheaper over the last year, relative to the dollar, purchasing an iStill has become significantly more affordable.

An example

The iStill 2000 Hybrid costs EUR 90,000.-. At the “old” exchange rate per January 1st 2022, with one Euro costing USD 1.15, this translated into a purchase costs in dollars of USD 103,500.-.

Given that the current exchange rate for the Euro is about USD 1.00 instead of USD 1.15, buying in Euro’s has become a lot cheaper. The EUR 90,000.- iStill 2000 Hybrid now only costs USD 90,000.-.

There you have it: a BIG opportunity for American distillers to buy iStills at a discount. Where the iStill 2000 Hybrid would have costed you USD 103,500.- a little over half a year ago, it now sets you back only USD 90,000.-. Your savings? USD 13,500.-! If you want to take advantage of this opportunity, please reach out to us via …

Meet the Beast!

The iStill 5000 is the biggest still / distillery we produce. It can mash, ferment, and distill up to 5000 liters of boiler charge. It’ll produce any drink to perfection. You dial in a recipe, save it, and the iStill 5000 will do that run over and over again. Precision leads to reproducibility leads to consistent quality.

Lowest energy consumption per liter of spirits produced? You bet! Depending on settings the iStill 5000 is 90 to 95% energy efficient, versus 25 to 30% energy efficiency for traditional stills. Lower costs directly translate into higher margins, and green is the new gold.

Longevity? We have units that are in constant spirits production and have over 20,000 hours under their belt. Without downtime. Without issues. Without the need for spare or replacement parts. We build distilleries that last. Decades, not years.

Underneath are pictures of the latest iteration of the iStill 5000. With upgraded 120 kW power management and the new reworked and slightly taller and beefier column. We currently have two in production. One for a Japanese whiskey distillery, the other for a Belgium gin distillery.

The next one could be yours. I mean, what other distillery allows you to mash, ferment, and distill 2.5 barrels of 60 to 65% new make spirit per week with time left to also produce a batch of 4,000 bottles of – say – gin or vodka? What other still helps you produce – again, on a weekly basis – up to 17,500 bottles of rum or whiskey? Fully automated, no need for an expensive master distiller, and for less than 175,000 dollars or Euro …

This one goes to Belgium, sorry …

Fully build-up, which takes less than 3 hours …

Preparing for Drinktec Munich 2022!

We are preparing for the world’s biggest brewing and distilling convention in Munich. We’ll have a large booth and will be taking with us:

  • iStill 250
  • iStill 500
  • iStill 2000
  • iStill 5000 (with copper column)

Drinktec is from Monday September 12th to Friday September 16th. Are you an iStill customer? Are you considering the purchase of an iStill and do you want to meet the iStills and our team? Reach out to to claim a free entrance ticket!

Here are pictures of the iStills 500 and 2000 on our bespoke display pallets …