How to Brew Coffee with a Siphon (Vacuum Pot)

If you’ve ever watched coffee bloom and drift upward in a glass chamber like a science experiment, you’ve seen a siphon brew in action. This theatrical method doesn’t just look cool—it gives you full visibility into the extraction process, making it a favorite for coffee enthusiasts who want precision and atmosphere.

To brew one cup of siphon coffee the traditional way, use 15 grams of medium-ground single-origin beans with 200 milliliters of hot water, stir twice during a 60-second extraction, then let the coffee draw back down before serving. The entire process takes around four minutes.

What Is a Siphon (Vacuum) Coffee Maker?

The siphon coffee maker—also called a vacuum pot or syphon—was invented in 1840 by British marine engineer Robert Napier. By the early 20th century, it had evolved into its current form, later spreading from the U.S. to Japan. It’s most commonly used for brewing single-origin coffees, allowing you to watch the entire brewing process unfold in two connected glass chambers.

How Does the Siphon Coffee Maker Work?

A siphon brewer consists of two glass chambers: an upper and a lower bulb (or “upper and lower seat”), joined by a seal. The lower chamber sits on a metal stand with a screw to keep it stable. A filter—made of a wire filter spoon, cloth, spring, and hook—is placed inside the upper chamber. This cloth filter directly contacts the coffee grounds, so keeping it clean is essential for quality extraction.

Heat is applied to the bottom chamber—usually via an alcohol lamp or gas burner. As the water boils, vapor pressure forces it up into the upper chamber where it mixes with the coffee grounds. Once the heat is removed, the brewed coffee travels back down through the filter into the lower chamber by gravity. The whole cycle takes roughly four minutes. For best results, use filtered water for a cleaner taste.

Siphon Brewing: Tools, Ratios & Setup

Here’s what you’ll need to brew siphon coffee:

• Siphon (vacuum pot) brewer
• Alcohol lamp or gas burner
• Cloth filter and filter spoon
• One large coffee cup
• Coffee scoop
• Burr grinder
• Stirring stick (bamboo or similar)
• Timer
• Measuring spoon

You can use any coffee bean roast level—from light to dark—but single-origin beans are ideal to highlight clarity in the cup.

For one cup:

• Coffee: 15 grams (medium grind, similar to table salt)
• Water: 200 milliliters (use filtered if possible)

The Siphon Coffee Recipe (Step-by-Step Guide)

Follow these exact steps for a proper siphon brew:

1. Check that your siphon’s upper and lower chambers, filter, and cloth are intact. Ensure you have a timer, stirring stick, and coffee scoop ready.
2. Add filtered water to the lower chamber up to the 200 ml mark.
3. Place 15 grams of medium-ground coffee into the upper chamber. Gently tap to level the surface.
4. Hang the filter assembly by its hook so it sits centrally over the glass tube inside the upper chamber. Make sure the hook points downward.
5. Dry the outside of both chambers with a cloth. Preheat your cup with hot water or a cup warmer. Place the siphon on the burner and light the lamp or gas.
6. When tiny bubbles start rising in the lower chamber (just before full boil), insert the upper chamber into the lower one.
7. As water rises and begins to bubble in the upper chamber, reduce the flame. Start the timer, and stir the coffee 5–6 times in a clockwise direction.
8. After 30 seconds, insert the stirring stick about two-thirds down into the coffee and perform a second stir.
9. Turn off the heat after 60 seconds of brewing—except for Blue Mountain and Kona beans, which are brewed for 45–50 seconds.
10. Release pressure in the lower chamber, then gently lift and remove the upper chamber.
11. Pour the brewed coffee into your preheated cup (fill to about 80% full). Serve with a coffee saucer, spoon, milk, and sugar if desired.

Brewing Tips by Coffee Type

Different beans may require slight timing adjustments. Here’s a quick reference:

Note: Do not insert the upper chamber too early, or extraction will be incomplete. Also, limit stirring time to preserve aroma and prevent cloudiness.

Frequently Asked Questions

How does a siphon coffee maker actually work?

A siphon brewer uses vapor pressure to push heated water from the lower glass chamber into the upper chamber where it brews with coffee grounds. Once the heat source is removed, a vacuum forms in the lower chamber and pulls the brewed coffee back down through a cloth filter. The entire cycle takes around four minutes.

What grind size should I use for siphon coffee?

Use a medium grind, similar in size to table salt—about a medium or medium-fine consistency. This helps ensure even extraction during the 60-second brew time.

How much coffee and water do I use per cup?

For a single cup, use 15 grams of coffee and 200 milliliters of water. Adjust quantities proportionally if brewing more.

What kind of beans work best in a siphon?

Siphon brewing highlights clarity and origin character, so single-origin beans from light to dark roast all work. Avoid overly oily or very dark roasts that may clog the filter or mask subtle flavors.

Do I need to preheat my cup when brewing siphon coffee?

Yes, warming your cup improves temperature stability and enhances the drinking experience. Preheat it with hot water or place it on a cup warmer before serving.

How long should I stir the coffee during brewing?

Stir the coffee twice: once right after the water enters the upper chamber (5–6 clockwise rotations), and again 30 seconds in (stir halfway down with the bamboo stick). Keep stirring brief to avoid over-extraction or bitterness.

Recommended FrontStreet Coffee for Siphon Brewing

For siphon brewing, try FrontStreet Coffee’s Ethiopia Yirgacheffe for bright floral and citrus notes, or their Colombia Huila for balanced caramel and nuttiness. Both single-origin beans highlight the clarity and aroma that siphon extraction is known for. Freshly roasted within 5 days · Orders placed before 17:00 ship the same day · Next-day delivery across most of Guangdong Province.