Siphon Coffee: How to Brew, Ratios, Filters and Drawdown

Key Takeaways

• 1Siphon is immersion followed by filtration: heat lifts water, coffee steeps above, and cooling allows filtered coffee to return below.
• 2Use a recipe that matches the model. HARIO's named method uses 10 g coffee per 120 ml (4.1 US fl oz) water; its 40–60 seconds is the upper-bowl stage, not total preparation time.
• 3Fit the filter securely and respect the heat source. Finish drawdown before separating the bowls, and clean the filter after use.

Highlights

Method

Immersion, then filtered drawdown

HARIO dose

10 g coffee per 120 ml (4.1 US fl oz) water

Grind

Medium, not powder-fine

Timed stage

40–60 seconds in upper bowl

Example serving

240 g (8.5 oz) plain brewed coffee

Generic reference

96 mg caffeine · about 2 kcal · 0 g sugar

How Siphon Coffee Moves Between the Bowls

Heat increases pressure in the lower globe and pushes water up the connecting tube. Coffee and water mix in the upper bowl, while a small amount of water remains below. Once heating stops, cooling and condensation lower the pressure in the globe; atmospheric pressure and gravity help the coffee return through the filter.

This is why a siphon is also called a vacuum coffee maker. It does not pull espresso through a packed coffee bed. In a moka pot, pressure drives water through the grounds into a separate upper collector; the finished coffee does not return to the base.

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Siphon Coffee Ratio, Grind and Capacity

HARIO's published starting point is 10 g coffee with 120 ml (4.1 US fl oz) water. Its manual describes about 100 ml (3.4 US fl oz) finished coffee from those inputs. Water input and collected coffee are different quantities.

The Technica product listing identifies these sizes. A “cup” here is a small manufacturer unit, not a full-size mug.

The dose column is our arithmetic using the maker's starting point. Follow the markings and manual supplied with your specific model; do not put a five-cup batch in a smaller brewer.

Start with the manual's medium grind. Compare your grounds with a grind-size reference. Very fine particles can slow filtration. Record dose, water, grind, upper-bowl time and filter type so a change is meaningful.

How to Brew with a Siphon

This sequence follows HARIO Europe's coffee-first method, with heat-source handling checked against its Technica manual. For a 3-cup Technica example, use 30 g medium-ground coffee and 360 ml (12.2 US fl oz) water input.

Recipe

3-Cup HARIO Technica Siphon Coffee

Makes:

1 batch, approximately 300 ml (10.1 US fl oz); measure the coffee collected

Time:

40–60 seconds in the upper bowl, plus heating and drawdown

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Ingredients

• 30 g medium-ground coffee
• 360 ml (12.2 US fl oz) brewing water, plus separate cloth-preparation water

Equipment

• 3-cup HARIO Technica
• Matching cloth filter and holder
• Stand
• Upper-bowl holder
• Approved heat source
• Kettle
• Scale
• Water measure
• Timer
• Suitable stirrer
• Heat protection

Method

1. Fit the filter. Prepare a new HARIO cloth filter in boiling water before use. Seat the filter centrally in the upper bowl, draw its chain down the tube and attach the hook as the Technica manual instructs.
2. Add the coffee above. Put 30 g medium-ground coffee in the upper bowl before heating.
3. Add water below. Pour 360 ml (12.2 US fl oz) water into the lower globe, secure it to the stand and dry the outside completely before heating. Preheated water reduces warm-up time.
4. Heat and seat the upper bowl. Follow the manual's initial angled placement. When the water boils, gently bring the upper bowl upright to seal; never force the glass.
5. Stir and time. When water has risen, gently wet and mix the grounds with a suitable stirrer. Brew in the upper bowl for 40–60 seconds. Keep heat controlled and centered beneath the lower globe.
6. Stop heating safely. Follow the heat source's instructions. For the supplied alcohol lamp, extinguish with its cover and confirm the flame is out before moving the lamp. Do not move or refill a burning lamp.
7. Wait for drawdown. Let the coffee return through the filter without forcing the upper bowl off. After drawdown finishes, hold the stand, gently loosen the upper bowl and place it in its holder. Use heat protection as needed.
8. Serve and clean. Pour from the lower bowl. Let hot glass cool before washing; do not put it on a wet surface or add cold water to hot glass.

Recipe notes

HARIO Europe coffee-first method, scaled to the 3-cup example. Water input is not finished yield.

Check the glass for damage and use a stable heat-safe surface. Never move or refill a burning alcohol lamp; do not heat the lower globe dry.

I enjoy following the siphon's lift, steep and drawdown as separate stages. I note the steep once the coffee and water are together; a longer warm-up isn't the same as giving the grounds more brewing time.

The 3-cup example yields an estimated 300 ml (10.1 US fl oz). Measure the collected coffee before dividing it into servings.

Heat and Timing: What You Are Controlling

Siphon brewing uses sustained heat rather than a cooling kettle pour. The brewer, heat source, room and altitude affect upper-bowl temperature. Maintain the heat needed for the selected method, rather than chasing dramatic bubbling.

If changing the coffee dose or grind, keep the starting water amount and timing consistent for the comparison. Taste the result after it cools enough to assess. For weak coffee, check the recorded dose and grind before increasing heat.

Siphon Filters and Cleaning

Use a filter and holder compatible with your siphon. HARIO's Technica includes a cloth filter; its product page also lists compatible paper and stainless-steel options. Changing only the filter can change sediment and texture, so record that choice with the recipe.

For HARIO's cloth filter, the manual says to immerse it in boiling water before first use, wash after brewing, then store it in a container of water in the refrigerator, changing that water regularly. Follow that specific care routine instead of leaving a used wet filter exposed on the counter. Replace worn cloth.

Wash the glass with a soft sponge and neutral detergent, avoiding abrasive cleaners and hard impacts. The manual warns against forceful twisting inside the glass. For other cloth brewing methods, see cloth-filter coffee and nel drip; their equipment and recipes are separate.

Siphon Troubleshooting: Lift and Drawdown

If the glass is cracked or chipped, stop using it. If a hot brewer behaves unexpectedly, do not force apart its chambers or plug its opening. Let it cool and consult the model's instructions.

The Taste, and Who It Suits

Siphon gives you immersion brewing with a separate filtration stage. Its texture depends on the filter and coffee, while dose, grind, heat and time shape extraction. A cloth or paper-filtered serving can contain less visible sediment than a typical metal-screen French press.

Choose siphon if you enjoy the visible process and can give assembly and cleanup attention. For a simpler gravity-driven routine, compare pour-over. For the same coffee, evaluate the cup at similar serving temperature before deciding which preparation you prefer.

A Short History of the Siphon

Vacuum brewers predate HARIO's modern models. The company identifies its 1948 HIROMU siphon as its first commercial coffee product. Its current guide also describes siphon's continued presence in Japan.

Caffeine, Calories and Sugar

Estimated nutrition for a 240 g (8.5 oz) generic brewed-coffee serving: 96 mg caffeine, 2 kcal and 0 g sugar.

Coffee type, dose, extraction and the amount poured affect caffeine. Milk and sweeteners add their own nutrition.

Serving calculation and source limits

USDA Standard Reference record 14209 lists plain brewed coffee prepared with tap water at 40 mg caffeine, 1 kcal and 0 g total sugar per 100 g. For 240 g, the calculation gives 96 mg caffeine, 2.4 kcal and 0 g sugar, with energy rounded to about 2 kcal. The serving is weighed finished coffee, not 240 ml (8.1 US fl oz) of input water. It is separate from HARIO's 30 g / 360 ml (12.2 US fl oz) method example, whose nutrition has not been measured. The reference excludes milk, sugar and other additions.

Common Questions Before You Brew

Is Siphon Coffee Espresso?

No. Both can involve pressure, but a siphon brews by immersion above and then filters downward. It does not reproduce an espresso machine's extraction through a compacted puck.

What Grind Size Should I Use?

HARIO specifies medium grounds for its siphon method. Start there, then assess extraction and drawdown. If drawdown stalls, check for overly fine grounds.

Do I Have to Use a Cloth Filter?

No, if your model supports another filter and matching holder. HARIO lists paper and stainless-steel alternatives for the Technica. Check compatibility before swapping parts.

When Do I Start the Brew Timer?

Start HARIO's 40–60-second upper-bowl timer after the water has risen and you have mixed the coffee. Heating the water beforehand is a separate stage.

Why Does Coffee Stay in the Upper Bowl?

Stop heating safely and let the lower globe cool so drawdown can begin. If coffee still stays above, let the brewer cool before checking for a badly seated or clogged filter. Do not force apart a hot stalled brewer.

Editor's Take

Sources and Further Reading

5 references

External links open in a new tab

• HARIO EuropeCoffee-first siphon methodNamed 10 g / 120 ml (4.1 US fl oz) starting point and 40–60 second upper-bowl stage.(opens in a new tab)
• HARIOTechnica instruction manualFilter fitting, medium grind, heating, lamp handling, approximate yield and cloth care; follow your supplied model manual.(opens in a new tab)
• HARIO EuropeTechnica sizes and filters240, 360 and 600 ml listings, compatible filter options and the maker's 1948 coffee-product history.(opens in a new tab)
• HARIO USATechnica operating principlePressure-driven lift, upper-bowl brewing and filtered return; 600 ml (20.3 US fl oz) TCA-5 listing.(opens in a new tab)
• USDA Standard ReferencePlain brewed-coffee referenceNDB 14209 (pages 546–548), used only for the separately defined generic serving.(opens in a new tab)