⚗️ Siphon (Vacuum Pot) Brew Guide
Theatrical brewing science with a tea-clean, remarkably clear cup
Siphon (or syphon) coffee uses vapor pressure, not gravity or a pump, to move water between two glass chambers. Heated water rises into an upper chamber to steep with the grounds, then as the heat is removed the vapor contracts and pulls the finished coffee back down through a filter — a full-immersion brew with the clarity of a paper filter and a bit of theater on the counter.
Coffee
25g
freshly ground
Water
375ml
filtered
Temp
94°C
201°F
Grind
Medium to medium-coarse
Similar to pour over, slightly coarser — think coarse sea salt. The cloth or metal filter at the base of the upper chamber is more permeable than paper, so too fine a grind risks sediment slipping through and clouding the cup.
Total Time
5:00
6 steps
Ready to brew
Set Up
Seat a pre-soaked filter in the bottom of the upper chamber, hooked onto the glass tube. Fill the lower chamber with 375 ml of hot water and attach the burner or butane torch beneath it.
1:00
☕ Brew complete! Enjoy your Siphon (Vacuum Pot).
Recipe Steps
1
Set Up 1:00
Seat a pre-soaked filter in the bottom of the upper chamber, hooked onto the glass tube. Fill the lower chamber with 375 ml of hot water and attach the burner or butane torch beneath it.
2
Heat & Rise 1:30
Insert the upper chamber at an angle so it isn't airtight yet, and apply heat. As the lower chamber's water nears boiling, straighten the upper chamber to seal the two — rising vapor pressure pushes the water up through the tube into the upper chamber.
3
Add Coffee & Stir 0:15
Once most of the water has risen, add 25 g of grounds to the upper chamber and give it a quick stir to break up any dry clumps and saturate evenly.
4
Steep 1:00
Stir gently once or twice more during the steep to keep extraction even. At around the 1-minute mark, remove the heat source entirely — this is what starts the vacuum draw-down.
5
Draw Down 1:00
As the lower chamber cools, vapor there contracts and pulls the brewed coffee back down through the filter, leaving the spent grounds behind in the upper chamber. A full draw-down takes about a minute; a slower one usually means the grind was too fine.
6
Detach & Serve 0:15
Once the draw-down finishes with a distinctive gurgle, twist off the upper chamber and pour straight from the lower chamber. Serve immediately — siphon coffee's clarity fades fastest of any method as it sits.
Frequently Asked Questions
What grind size works best for siphon brewing?
Medium to medium-coarse — similar to pour over, like coarse sea salt. The cloth or metal filter is more porous than paper, so too fine a grind can slip past it and leave sediment in the cup, while too coarse under-extracts during the short steep.
How does a siphon coffee maker actually work?
It uses vapor pressure instead of gravity or a pump. Heating the lower chamber builds pressure that pushes water up a tube into the upper chamber, where it steeps with the grounds. Removing the heat lets the lower chamber cool and contract, pulling the brewed coffee back down through a filter by vacuum.
Why does siphon coffee taste different from pour over?
Both use paper-or-cloth filtration, but siphon is a full-immersion brew — the grounds sit steeping in water the whole time, like a French press, rather than water passing through once. That combination of immersion plus filtration produces a cup that's exceptionally clean and tea-like, with more clarity than French press and often more body than pour over.
Do I need a butane torch to brew siphon coffee?
A halogen beam heater or small butane burner sold with siphon sets both work; some induction-compatible siphons use a stovetop base instead. Open-flame alcohol burners are the traditional option but heat less evenly — a controllable heat source that lets you remove heat precisely at the 1-minute mark matters more than which type you use.
Why is siphon coffee less common than pour over or French press?
The equipment is fragile (blown glass, an open flame or halogen heater), slower and more hands-on than a dripper, and harder to brew for a crowd. What it offers in return — remarkable clarity, a full-immersion body, and a genuinely theatrical brewing process — is why cafés still use it as a showpiece method even though it never went mainstream at home.
Other brew guides: Pour Over · AeroPress · Espresso · French Press · Moka Pot · Cold Brew · Chemex · Turkish Coffee · Vietnamese Phin · Percolator