Pressurised vs. non-pressurised espresso basket
The single most consequential choice on an entry-level espresso machine, and the one most people do not realise they have made.
| Aspect | Espresso basket | Pressurised basket |
|---|---|---|
| Where the resistance comes from | Single-wall: entirely from the coffee bed, so grind, dose and distribution all matter | Dual-wall: from a pinhole in a second wall, so the basket sets the flow regardless of the coffee |
| How to tell which you have | Many fine holes across the whole underside | One small hole underneath, usually in a removable insert |
| Works with pre-ground coffee | Poorly — the shot runs fast and sour | Yes, which is why entry-level machines ship with one |
| Crema | Emulsified from the extraction itself | Largely aeration at the pinhole; plentiful and short-lived |
| Responds to grind adjustment | Yes, and finely | Barely — which is why troubleshooting advice fails with one fitted |
| Ceiling | As good as your grinder and technique allow | Drinkable, consistent, and capped |
Which should you choose?
If you have a grinder that can produce and finely adjust an espresso grind, fit a single-wall basket — it is where almost every improvement in espresso becomes possible. If you are using pre-ground coffee or a blade grinder, keep the pressurised one; a single-wall basket will simply give you a fast, sour shot and no way to fix it. Check which you have before troubleshooting anything at all.