AeroPress

The versions, and what really differs

Widely documented

Standard size

The original format. It presses directly into most mugs and has the widest choice of filters and accessories made for it.

Travel size

A shorter chamber that packs into its own cup. It brews a little less per press, which matters if you like a full mug without diluting.

Large size

A bigger chamber intended for two cups. It needs its own, larger filters and a vessel wide and sturdy enough to press into.

Clear and premium-material versions

These change what the chamber is made of, not how the coffee is brewed. Choose them for looks or for a preference about materials, not for a different cup.

Paper discs, metal discs and flow-control caps

Tendency, not a guarantee

The standard paper filter is cheap, compostable and gives a clean cup with almost no sediment. A reusable metal disc lets more oil and fine particles through, so the coffee is heavier in the mouth and slightly cloudy. Neither is better; they are different drinks from the same brewer.

The standard cap lets coffee begin dripping as soon as water is added. Caps with a pressure-actuated valve hold the liquid back until you press, which removes the reason many people brew with the device upside down. If the dripping bothers you, that accessory solves it more safely than inverting.

The one part that wears

Widely documented

The plunger seal is what makes the device work, and it is the only part that normally needs replacing. A worn seal lets air or liquid past, so the plunger sinks with no resistance. Replacement seals are sold separately.

Older versions had a natural rubber seal that wore faster if it was stored squeezed inside the chamber, which is where the advice to push the plunger all the way through after rinsing comes from. The maker says the silicone seal fitted to current versions does not fatigue under compression and can be stored inside the chamber. Pushing the plunger through still does no harm, and it ejects the spent coffee. For cleaning, the maker describes a rinse as sufficient day to day and says most versions can go in the top rack of a dishwasher, with at least one premium-material version hand-wash only; check which you have.

What you need besides the brewer

CoffeeHQ explanation

1. A way to heat water. Any kettle works. A pouring kettle with a fine spout is not needed, because the water is poured in all at once rather than in a controlled stream.
2. A sturdy mug or server. You press down with some force. Use a solid mug on a stable surface, and avoid thin glass or anything narrower than the brewer's base.
3. Ground coffee, and ideally a grinder. It tolerates a wide range of grinds, so pre-ground filter coffee works. A grinder becomes worthwhile when you want to adjust the cup, since grind is the main lever.
4. A scale, eventually. The numbered markings on the chamber are a rough guide. Weighing coffee and water is what makes a good cup repeatable.

Problems that belong to the device, not the recipe

CoffeeHQ explanation

The plunger drops with no resistance

Usually because: The seal is worn, or on an older rubber-sealed version has lost its shape from being stored compressed.

Change first: Replace the seal.

Pressing is very hard or stalls

Usually because: The grind is too fine for the amount of coffee, so the bed is choking the filter.

Change first: Grind coarser rather than pressing harder.

Grind size guide

Coffee runs through before you are ready

Usually because: The standard cap does not hold liquid back, and a coarse grind lets it through fast.

Change first: Insert the plunger a little way to create a vacuum, or use a flow-control cap.

Hot water spills when brewing inverted

Usually because: The inverted position is top-heavy and relies on the seal holding.

Change first: Brew upright. The maker strongly discourages the inverted method because of the risk of burns from hot liquid; a flow-control cap gives the same long steep without it.

When a different brewer is the better buy

CoffeeHQ explanation

• French press — Makes several cups at once and needs no paper filters, at the cost of a heavier, more sedimented cup and more cleaning.
• Pour-over dripper — Gives more clarity and scales to two or three cups, but asks for a pouring kettle and more attention to technique.
• Moka pot — Closer to espresso in strength and needs no filters at all, though it is less forgiving and tied to a hob.

What to do next

• How to brew with an AeroPress — The recipe, the technique and what to change when the cup is not right.
• AeroPress vs French press — The closest alternative, compared on what ends up in the cup.
• Paper vs metal filter — What the choice of disc changes, explained in full.
• Coffee-maker selector — If one mug at a time may not be enough for your household.
• Become a barista — A structured programme from dose and grind through milk, drinks and maintenance.