Pressurized vs Non-Pressurized Baskets

In a single-wall basket, the compacted coffee puck is the only thing slowing the water down. Grind finer and the puck resists more; grind coarser and water rushes through. That's why grind size controls the shot.

A dual-wall basket adds a second wall with one small exit hole. Coffee extracts into the gap between the walls, then squeezes out through that hole. The hole creates the resistance, so the puck matters much less. Forcing the coffee through a pinhole also whips air into it, which is the foamy layer that looks like crema.

The trade-off is control. Because the basket sets the pressure, changing your grind changes the shot far less, so you can't fine-tune flavor the way you can with a single-wall basket. Our espresso crema explainer covers why that foam isn't a sign of a great shot.

If you're choosing a grinder for this upgrade, our burr grinder buying guide explains what an espresso grinder needs.

1. 1

   Use fresh whole beans, ideally roasted within the last few weeks.

2. 2

   Set your grinder noticeably finer than you used with the pressurized basket.

3. 3

   Dose to the basket size and weigh it; about 18g for a typical double basket is a common start.

4. 4

   Distribute the grounds evenly, then tamp level and firmly.

5. 5

   Pull a double into a cup on a scale and aim for about twice the dose in liquid in 25–30 seconds.25–30 seconds

6. 6

   Fast and sour: grind finer. Slow and bitter: grind coarser. Change one thing per shot.

Expect your first few shots to be off: that's the basket giving you honest feedback. Our dial-in guide and sour espresso fixes cover the next steps, and Barista Express owners can start from our grind settings by roast.

• WDT: stirring the grounds with fine needles breaks up clumps that cause channeling. See what WDT is and how to use it.
• A puck screen: a thin mesh disc on top of the puck spreads water more evenly and keeps the group head cleaner. Read whether puck screens are worth it.
• A bottomless portafilter: shows channeling as sprays and pale spots, which makes puck-prep problems obvious. It only works with single-wall baskets.
• A precision basket: aftermarket single-wall baskets with tighter hole tolerances can give more even extraction, once your grinder and technique are consistent.
• A scale: weighing dose and output matters more with single-wall baskets because they react to small changes.

Many Breville semi-automatics, including the Bambino Plus and Barista Express, ship with both dual-wall and single-wall baskets, so you can start forgiving and switch later. Our Bambino Plus vs Barista Express comparison covers both.

Several budget De'Longhi machines are built around pressurized baskets. The Dedica EC685 uses a pressurized basket only in our review, so moving to single-wall means buying an aftermarket 51mm basket or bottomless portafilter. The Stilosa EC260 is similar in spirit: forgiving, but with limited room to grow.

Machine contents change between production runs and regions, so check the box list on the listing before buying if basket type matters to you. Still choosing a first machine? Our best espresso machines for beginners notes which basket each pick ships with.

Ships with both basket types

Breville Bambino Plus

Start on dual-wall with pre-ground coffee, then switch to single-wall once you add a grinder.

Check current priceRead the review

Pressurized-first budget machine

DeLonghi Dedica EC685

Very narrow and forgiving of a budget grinder. Single-wall needs an aftermarket 51mm upgrade.

Check current priceRead the review

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If shots still channel or run unevenly after switching, see our guide to espresso channeling.