How to Use a Siphon Coffee Maker

A siphon coffee maker brews coffee using vapor pressure and a vacuum: heating water in a lower glass chamber pushes it up into an upper chamber where it steeps with the grounds, and when you remove the heat, the cooling lower chamber pulls the finished coffee back down through a filter. To use one, heat the water until it rises, stir in medium-ground coffee, brew for about a minute, then kill the heat and let the drawdown happen. The result is a clean, aromatic, tea-like cup, and a show that is fun to watch.

Also called a vacuum pot, vac pot or syphon, this brewer looks like lab equipment, and that is part of its charm. Vacuum brewers date back to the first half of the 19th century, and the design has barely changed since. Here is how it works, how to use it step by step, and how to stay safe with hot glass and open flames.

How a Siphon Coffee Maker Works

A siphon has two chambers connected by a tube, with a filter sitting at the bottom of the upper chamber.

1. Heating: As the water in the sealed lower chamber heats up, the air and water vapor inside expand. The rising pressure forces the water up the tube into the upper chamber. A little water always stays in the bottom, which is why it does not run dry.
2. Steeping: With heat still applied, the water stays in the upper chamber, just below boiling. You add the coffee, stir and let it steep, much like a French press.
3. Drawdown: When you remove the heat, the lower chamber cools and its pressure drops, creating a partial vacuum. Atmospheric pressure and gravity pull the coffee back down through the filter, leaving the grounds behind in the upper chamber.

The beauty of this system is that the water stays at a stable, hot temperature during the steep, and the filter gives a cup with excellent clarity.

Heat sources and filters

How to Use a Siphon Coffee Maker, Step by Step

Recipe for about 2 cups: 25 g (about 4 tbsp) of medium-ground coffee and 375 g (12.7 fl oz) of water, a ratio of 1:15. Grind like coarse sand, slightly finer than drip.

1. Prepare the filter. If it is cloth, soak it in warm water first. Insert it in the upper chamber and hook the chain or spring to the bottom of the tube so it sits centered.
2. Fill the lower chamber with hot water from a kettle. Starting hot saves a lot of time on the burner. Dry the outside of the glass completely.
3. Start heating. Light the burner under the lower chamber. Rest the upper chamber loosely on top at an angle, without sealing it.
4. Seat the top. When small bubbles start rising steadily, press the upper chamber gently but firmly into the lower one to seal it. Water will begin climbing into the top.
5. Lower the heat. Once most of the water has risen, reduce the flame so the water stays hot without boiling violently.
6. Add the coffee and stir. Pour in the grounds and stir gently for a few seconds until there are no dry clumps.
7. Steep for about 1 minute. Some brewers give a second gentle stir at around 45 seconds.
8. Remove the heat. Turn off or move the burner. Give one last gentle swirl or stir to help form an even bed.
9. Watch the drawdown. The coffee will rush back into the lower chamber in about 30 to 60 seconds, leaving a neat dome of grounds above the filter.
10. Remove the top and serve. Gently rock the upper chamber free, set it on its stand and pour from the lower chamber.

Tips for a Better Siphon Brew

• Dial in with grind. If the drawdown takes over 2 minutes or the coffee tastes bitter, grind coarser. If it is fast and thin, grind finer.
• Keep the steep short. Because the water stays so hot, siphon coffee can over-extract quickly. One minute is a good default; adjust by 10 to 15 seconds.
• Avoid over-stirring. A gentle stir is enough. Aggressive stirring pushes fines into the filter and slows the drawdown.
• Use good water. A clean cup shows off flaws too. See our guide to the best water for coffee.
• Measure precisely. Our coffee to water ratio guide helps you scale the recipe for your siphon's size.

Siphon Coffee Maker Safety

A siphon combines thin glass, near-boiling water and often an open flame. A few precautions keep it fun:

• Never heat an empty lower chamber. Always add water first.
• Dry the outside of the glass before heating. Water droplets on hot glass can cause thermal stress.
• Use a stable, heat-safe surface away from curtains, paper and anything flammable.
• Handle only by the handles or stand. Both chambers get very hot.
• Do not force the upper chamber out while the lower one is still under heat. Remove the heat first.
• Store and refill alcohol burners carefully, and never refill one while it is lit or hot.
• Follow your manufacturer's instructions, especially for stovetop models and filter care.

What Does Siphon Coffee Taste Like?

Siphon coffee sits between a French press and a pour over. Full immersion and stable heat give rich, complete extraction, while the filter keeps out most sediment. With a cloth or paper filter, the cup is clean, aromatic and smooth, with a silky texture and clear flavors. It is a great way to discover what makes a single origin unique.

• Ethiopia Natural: fruity and perfumed, spectacular in a siphon.
• Guatemala: chocolatey and balanced. Learn more in our article on Guatemalan coffee.
• Kenya: bright and juicy.

Curious about the science of extraction behind it? Our guide to TDS and extraction yield goes deeper. For more on vacuum brewing's background, see the encyclopedia entry on the vacuum coffee maker.

Siphon Coffee Maker FAQ

Is a siphon coffee maker worth it?

If you enjoy the ritual and want a clean, aromatic cup, yes. It takes more time and care than a drip machine, but it gives you precise control and a memorable brewing experience.

What grind is best for a siphon coffee maker?

Medium, slightly finer than drip, works for most siphons. Adjust finer if the coffee tastes weak and coarser if it is bitter or the drawdown is slow.

How long should siphon coffee steep?

About 1 minute after adding the coffee is a good starting point. The total process, including heating, usually takes several minutes depending on your heat source.

Why is my siphon not drawing down?

A stalled drawdown usually means the grind is too fine, the coffee was over-stirred, or the filter is clogged. Grind coarser, stir gently, and clean or replace the filter.

Enjoy the Show, Then the Cup

A siphon coffee maker rewards a little patience with one of the cleanest, most aromatic cups you can brew at home. Heat, steep for a minute, remove the flame and watch the magic of the vacuum do the rest. Since Feel Espresso roasts every coffee order 1–5 days before delivery, your beans arrive full of the aromas a siphon loves to show off. Browse our single origins and pick a coffee worth the show.