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Espresso machines are sold on features that mostly do not matter and quiet about the ones that do. Pressure ratings of fifteen or twenty bars are marketing. What actually determines whether you can make good espresso is portafilter size, basket type, temperature stability, and the grinder standing next to it.
- 58 mm portafilter if you can afford it — the commercial standard
- Non-pressurised baskets, because pressurised ones cap your ceiling
- Temperature stability, ideally PID controlled
- Your grinder, which matters more than the machine
Ignore the bar rating
Espresso is extracted at about nine bars. Machines advertising fifteen or twenty bars are quoting pump maximums, not brew pressure, and higher is not better — excess pressure is bled off or, worse, forced through the puck causing channelling. A machine advertising twenty bars is telling you about its marketing department, not its capability.
Pressurised versus non-pressurised baskets
This is the single most important specification and it is rarely on the box. A pressurised basket has a restrictor that forces coffee through a small hole, generating fake crema regardless of grind quality. It makes bad coffee look right, which is useful if you use pre-ground coffee and a dead end if you want to improve.
Non-pressurised baskets do nothing to help you. Grind wrong and the shot gushes or chokes. That honesty is the point: it is the only way to actually learn, and the only way to reach genuinely good espresso.
Boiler types
| Type | How it works | Trade-off |
|---|---|---|
| Single boiler | One boiler for brew and steam, switched between | Cheapest; must wait between shot and steaming |
| Heat exchanger | One boiler, brew water passes through a heat exchanger | Brew and steam together; needs a cooling flush |
| Dual boiler | Separate boilers held at separate temperatures | Best performance and convenience; most expensive |
For one or two drinks a day a single boiler is entirely adequate. The case for dual boilers is milk volume, not shot quality.
Why a PID matters
Extraction temperature changes taste sharply. A few degrees too cool gives sour, under-extracted espresso; too hot gives bitterness. Simple thermostats swing several degrees around target, so results vary shot to shot. A PID controller holds temperature within about a degree, which removes a variable you would otherwise have to manage by timing.
Budget reality
Below a certain price you are choosing between pressurised-basket machines that will limit you. In the middle sit machines like the Gaggia Classic Pro and Rancilio Silvia, which give commercial portafilters and real technique. Above that you are buying convenience — PID, dual boilers, faster warm-up — rather than a fundamentally higher ceiling.
Whatever you spend, budget properly for the grinder. See the espresso grinder guide.
Frequently asked questions
How much should I spend on an espresso machine?
Enough to get a non-pressurised basket and ideally a 58 mm portafilter. Beyond that, additional money buys convenience and consistency rather than a higher quality ceiling.
Are 20-bar machines better than 9-bar?
No. Espresso extracts at around nine bars. Higher numbers are pump maximums and are marketing, not capability.
Do I need a dual boiler?
Only if you make several milk drinks back to back. For one or two a day, a single boiler is fine.