How to Brew Coffee with a Siphon (Vacuum) Pot

If you’ve ever watched a barista pull off a dramatic coffee brew with billowing vapors and a floating filter, chances are it was a siphon (or vacuum) pot. But making great siphon coffee at home isn’t about theatrics—it’s about precision. Whether you’re hosting friends or refining your technique, understanding how heat, pressure, and timing come together is key to a clean, aromatic cup.

To brew siphon coffee, use two cups (about 300ml) of water, 24g of medium-ground coffee (around 3 tablespoons), and follow a timed stirring method: stir once at 0 seconds, again at 30 seconds, and a final stir at 50 seconds before turning off the heat. Total brew time is around 90 seconds.

What Is a Siphon Coffee Maker?

A siphon coffee maker—also called a vacuum pot or siphon—is a stove- or burner-powered brewer that uses vapor pressure and suction to move water through coffee grounds. Despite the “siphon” name, it doesn’t work like a laboratory siphon. Instead, it relies on heating water to create steam pressure that pushes water into the upper chamber. When the heat is removed, the vapor cools, creating a vacuum that pulls the brewed coffee back down. It’s a visual, interactive way to make filtered coffee with a clean, bright profile.

Tools and Ingredients You’ll Need

• Siphon (vacuum) pot set (typically includes upper and lower chambers)
• Industrial alcohol (for fuel)
• Bamboo stirring spoon
• Damp cloth (wrung out)
• Coffee beans (24g recommended for two cups)
• Water (approximately 300ml or “two-cup” level)

Step-by-Step: How to Brew Siphon Coffee

1. Add Water & Attach Filter

Pour water into the lower chamber up to the “two-cup” marker. Place the cloth filter inside the upper chamber, then hook the chain to the bottom of the glass tube. Be gentle—don’t let go abruptly, or you may damage the glass.

2. Heat & Assemble

Light the alcohol lamp and attach the upper chamber at an angle so its rubber gasket rests on the lower chamber’s spout. Let the chain sit in the water. Heat until you see continuous large bubbles rising—not small ones. Keep the upper chamber slightly loose at this stage.

3. Lock in the Upper Chamber

When large bubbles form steadily, carefully straighten and press the upper chamber down until it sits snugly on the lower chamber. You’ll see water rising into the top. This is your cue to grind the coffee: aim for a medium grind, roughly equivalent to a setting that would produce 24g of coffee for two cups (about 3 tablespoons).

4. Wait for Full Transfer

Let all the water rise into the upper chamber. Once it’s fully transferred, wait a few seconds for bubbling to slow before adding the coffee grounds.

5. Add Coffee & Stir

Add the 24g of ground coffee to the upper chamber. Use the bamboo spoon to stir gently but thoroughly: sweep the grounds off the surface and push them down into the water. Start your timer immediately upon adding coffee. The first stir should be a wide, downward motion to ensure even saturation.

6. Stir Twice More, Then Remove Heat

At 30 seconds, perform a second stir. At 50 seconds, do a final stir. Right after the third stir, remove the alcohol lamp. Take a damp (but not dripping) cloth and gently wrap it around the lower chamber—avoiding the flame area—to help cool it and start the siphoning effect. You’ll see the brewed coffee rapidly draw back down into the lower chamber. Fresh coffee may produce a layer of light brown foam.

7. Serve Your Coffee

Once the coffee has fully descended, carefully separate the two chambers by gently rocking them side to side. Pour the coffee into pre-warmed cups and enjoy your hand-brewed siphon coffee.

Frequently Asked Questions

How much coffee do I use for a two-cup siphon brew?

Use 24g of coffee for a two-cup (approximately 300ml) brew. That’s roughly three tablespoons of medium-ground coffee.

What grind size is best for siphon coffee?

A medium grind is ideal—similar to table salt or a setting that would yield 24g from your grinder for this brew size. Avoid going too fine or too coarse.

How long does siphon coffee take to brew?

Total brew time is about 90 seconds: 60 seconds with heat applied, followed by 30 seconds after removing the heat while the coffee draws down into the lower chamber.

Do I need to stir the coffee during brewing?

Yes. Stir three times: once at 0 seconds, again at 30 seconds, and a final stir at 50 seconds. Use gentle, sweeping motions to saturate the grounds evenly.

Why does the coffee go back down after brewing?

When you remove the heat, the vapor cools and creates a partial vacuum in the lower chamber, which sucks the brewed coffee back down through the filter.

What kind of alcohol should I use for the lamp?

Use industrial alcohol (not ethanol or drinking alcohol) designed for burners. It burns cleaner and heats more steadily.

Recommended FrontStreet Beans for Siphon Brewing

For siphon coffee, we recommend FrontStreet Coffee’s Ethiopia Huakui for its vibrant floral and citrus notes, or their Yirgacheffe offering for a juicy, tea-like body. Both single origins highlight the clarity and cleanliness that siphon brewing is known for. Alternatively, try their Classic Blend for a balanced, approachable cup with nutty and chocolate hints. These beans shine when brewed with precision, making them ideal for siphon enthusiasts. Freshly roasted within 5 days · Orders placed before 17:00 ship the same day · Next-day delivery across most of Guangdong Province.