# Atomic Stovetop Coffee Maker

Source: https://dailyextraction.com/methods/atomic-coffee-maker/
Last updated: 2026-10-19

> Fill the Atomic's boiler with water, fill the coffee holder with a fine grind (not espresso fine) and clamp it into the head. Check the steam knob is shut, then heat it on the hob. Steam pressure pushes the water through the coffee into the jug, usually within 2 to 4 minutes. While it brews, open the steam knob to froth milk with the wand.

## At a glance

- Grind: Fine
- Category: Pressure & Espresso (Pressure)
- Difficulty: Intermediate
- Origin: Italy, 1946
- Also known as: Atomic coffee machine, Atomic espresso maker, Robbiati Atomic, Sassoon Atomic

## Steps

1. **Fill the boiler**: Fill the Atomic's boiler with water, then close the filler cap firmly. The manual says hot water is fine and gets things going quicker.
2. **Fill the coffee holder**: Fill the coffee holder with a fine grind, but not an espresso grind, and press it down gently with the back of a spoon. If you use less coffee or a smaller filter, pack it down a little more.
3. **Clamp it into the head**: Clamp the coffee holder into the head of the unit and set the jug in place.
4. **Shut the steam knob and heat**: Make sure the steam knob is shut, if your model has one, then put the Atomic on the hob on a high heat. Coffee usually starts to arrive within 2 to 4 minutes.
5. **Froth the milk**: As the coffee comes through, keep the heat high, put the steam wand deep into a jug of cold milk, open the knob several turns, then lower the jug until the wand tip just breaks the surface.
6. **Stop and serve**: The coffee fills to about three quarters of an inch from the top of the jug. Once the milk is frothed, turn the heat off, shut the steam knob and serve.

The **Atomic** is a stovetop espresso maker with a **steam wand**, and one of the most recognisable coffee makers ever designed: a rounded, polished aluminium body that looks a little like a 1950s rocket. A sealed boiler heats on the hob, **steam pressure** pushes hot water through coffee in a **clamped-in holder** and out into a jug, and the same steam feeds a wand for frothing milk. It was designed by **Giordano Robbiati** of Milan, who first filed his patent in Italy in **1946**. Here's how to use one and where it came from.

## The short version

- **A stovetop espresso maker** with a sealed boiler and a coffee holder that clamps into the head.
- **A steam wand** for frothing milk while the coffee brews.
- **A fine, consistent grind**, but not an espresso grind.
- **Coffee arrives in about 2 to 4 minutes** on a high heat.
- **First patented in Italy in 1946** by Giordano Robbiati, and later made under the Atomic name in Austria, Hungary and the UK.



## How does the Atomic work?

1. **The boiler is sealed**, so as the water heats on the hob, **steam pressure** builds inside it.
2. **That pressure pushes hot water** through the coffee in the holder clamped into the head, and out through a spout into the jug.
3. **The same steam feeds the wand.** Open the knob and steam comes out of the wand, ready to froth milk.

The Atomic works on the same steam pressure as a [moka pot](https://dailyextraction.com/methods/moka-pot/) and the first [steam espresso machines](https://dailyextraction.com/methods/steam-espresso/), well short of the roughly 9 bar of a modern [espresso](https://dailyextraction.com/methods/espresso/) machine. As Coffee Crew puts it, steam-powered makers like this lack the pressure to make true espresso.

## What do you need?

- **An Atomic**, with its coffee holder, jug and steam wand
- **A hob**
- **Coffee and a grinder** that can grind fine (not espresso fine) and consistently
- **Cold milk and a jug**, if you want to froth

## What grind size should I use?

**Fine and consistent, but not espresso fine.** The Atomic manual, transcribed by Coffee Crew, says to fill the holder with **finely ground coffee, not espresso ground coffee**. It stresses a consistent grind, and warns that coarse grounds make the steam build-up weaker, which also makes frothing harder.

![Chart of coffee grind sizes from extra fine to extra coarse, with fine highlighted for the Atomic coffee maker](https://dailyextraction.com/diagrams/grind-size.svg#fine "The Atomic sits between moka pot and espresso on the grind scale.")

## How do you use an Atomic, step by step?

These steps follow the **Coffee Crew Atomic manual**:

1. **Fill the boiler** with water and close the filler cap firmly. Hot water is fine and quicker.
2. **Fill the coffee holder** and press the coffee down gently with the back of a spoon. If you use less coffee or a smaller filter, pack it down a little more.
3. **Clamp the holder into the head** and set the jug in place.
4. **Make sure the steam knob is shut** (not every model has one), then heat on high. Coffee usually starts to arrive in **2 to 4 minutes**.
5. **Froth the milk as it brews**, keeping the heat high (see below). The coffee fills to about **three quarters of an inch** from the top of the jug.
6. **Turn the heat off** once the milk is frothed.

Afterwards, the manual says to **empty the leftover water** from the unit. For a smaller brew, it suggests less coffee and less water: a cup of water per cup of coffee, plus one cup for the steam.

## How do you froth milk with an Atomic?

Fill a pint jug about **half full of cold milk**. Put the wand deep into the milk, **open the red knob several turns** for plenty of steam, then lower the jug until the tip of the wand **just breaks the surface**. If the wand sits too deep, the milk just swirls and heats; it won't froth. Clean the wand tip after every use and never let dried milk build up on it.

## A short history of the Atomic

- **1946:** **Giordano Robbiati** of Milan files his patent in Italy. His US patent (No. 2,549,132, filed in June 1947 and granted in 1951) gives the Italian date as 14 September 1946, and his Austrian patent claims a priority date of 18 September 1946. Machines were made as **Brevetti Robbiati**. Some sources, such as the Museum of Design in Plastics, give 1947.
- **Several makers:** Wikipedia says the Atomic name was used by makers in **Italy, Austria, Hungary and the UK**. In Austria the trademark holder was **Desider Josef Stern** (Stella).
- **About 1955 to 1965:** **A. & M.G. Sassoon** made British versions, including a "standard" and a "Cappucino" model, also sold as Atomic. Wikipedia says one is on display at the Science Museum in London.
- **Today:** reproductions are sold, and the **Otto** is a stainless steel redesign of the original aluminium Atomic.

## Atomic vs other stovetop brewers

| | Atomic | [Moka pot](https://dailyextraction.com/methods/moka-pot/) | [Espresso](https://dailyextraction.com/methods/espresso/) machine |
| --- | --- | --- | --- |
| Pressure | Steam, well below espresso | Steam, about 1 to 2 bar | About 9 bar |
| Coffee holder | Clamped into the head | Basket in the base | Portafilter |
| Milk | Steam wand | None | Steam wand on most |
| Heat | Hob | Hob | Electric |

## How do you clean an Atomic?

Let it cool fully first. Empty the leftover water from the boiler, knock out and rinse the coffee holder, and wipe and clear the steam wand tip. The manual also says to leave the black filler knob **reasonably loose** between uses, or it can seize.

*General guidance only. The Atomic's boiler is under pressure when hot: never open the filler cap or remove the coffee holder while it's hot, check old seals before using a vintage one, and follow the maker's instructions.*

## Atomic vs other methods

- **[Moka pot](https://dailyextraction.com/methods/moka-pot/):** the everyday stovetop brewer, without a steam wand.
- **[Steam espresso](https://dailyextraction.com/methods/steam-espresso/):** the early café machines that worked on the same steam pressure.
- **[Espresso](https://dailyextraction.com/methods/espresso/):** the 9 bar shot the Atomic was imitating at home.
- **[Portable espresso](https://dailyextraction.com/methods/portable-espresso/):** modern hand-powered espresso away from the kitchen.

Explore every pressure method in the [pressure chapter](https://dailyextraction.com/methods/pressure/).

## Words used in this guide

- [Body](https://dailyextraction.com/glossary/body/): Body is how heavy and textured coffee feels in your mouth, from light and tea-like to thick and syrupy.
- [Portafilter](https://dailyextraction.com/glossary/portafilter/): A portafilter is the handle-and-holder you fill with ground coffee and lock into an espresso machine.

## FAQs

### How does an Atomic coffee maker work?

It's a stovetop espresso maker with a sealed boiler. As the water heats, steam pressure builds and pushes hot water through the coffee in the clamped-in holder and out into the jug. The same steam feeds a wand, opened with a knob, for frothing milk.

### Who invented the Atomic coffee maker?

It was designed by Giordano Robbiati of Milan. His US patent says he first filed in Italy on 14 September 1946, and it was made under the name Brevetti Robbiati. Some sources give 1947.

### What grind should I use in an Atomic?

A fine, consistent grind, but not an espresso grind: the Atomic manual says to use finely ground coffee and not espresso ground coffee. Too coarse and the steam pressure builds poorly, which also makes frothing harder.

### Is an Atomic the same as a moka pot?

No. Both use steam pressure on the hob, but the Atomic has a coffee holder that clamps into a head, a jug that fills from a spout, and a steam wand for milk. A moka pot pushes the coffee up a column into its top chamber and has no steam wand.

### Are Atomic coffee makers still made?

The original makers have long stopped, but reproductions are sold today, and the Otto is a stainless steel redesign of the original aluminium Atomic.

## Sources

- [US2549132A Coffee maker](https://patents.google.com/patent/US2549132A/en)
- [Atomic coffee maker](https://www.modip.ac.uk/artefact/aibdc-02331)
- [AT167450B Kaffeeschnellkochapparat](https://patents.google.com/patent/AT167450B/de)
- [Atomic (coffee machine)](https://en.wikipedia.org/wiki/Atomic_(coffee_machine))
- [The Atomic manual](https://www.coffeecrew.com/index.php/gear-equipment-coffee/321-the-atomic-manual)
- [Atomic coffee: through my eyes](https://www.coffeecrew.com/index.php/gear-equipment-coffee/428-atomic-coffee-through-my-eyes)
- [Otto stove top espresso maker](https://www.talkaboutcoffee.com/otto-stove-top-espresso-maker.html)