What 20 bar actually means on an espresso machine

Coffee machines · 2026-10-10

The published figures

Published coffee listings — what actually differs

Two listings state no pressure figure. They are shown as not stated rather than carrying a value from a similar model — a specification copied across a range is how a data sheet starts lying.

What bar pressure actually describes

An espresso shot is extracted at roughly 9 bar. A machine rated at 20 bar does not brew at 20 bar — the pump overshoots, and anopenvoltage regulator clamps the pressure to the brew range before water reaches the puck.

What the 20 bar rating describes is headroom: how much pressure the pump has in reserve above the brew requirement. That headroom matters for two practical reasons. The first is resistance — a fresh, dense coffee puck offers more resistance than a stale one, and a pump with headroom holds brew pressure through that resistance instead of sagging below it. The second is recovery after the shot, which is what determines whether the machine can pull a second cup back to back.

Why 20 bar became the number everyone quotes

There is no independent standard that defines what a 20 bar espresso machine must satisfy beyond delivering brew pressure in the correct range. The figure is not regulated, which means it is also not audited, which means two machines labelled 20 bar can behave very differently.

This matters commercially when you are comparing two machines for a range. A sensible way to use the figure is as a floor rather than a selling point: 19 bar and above is a functioning machine, and the differences that actually move resale value are elsewhere.

Where the real differences are in our own listings

Our published coffee range runs from $32 to $199. If bar pressure were the deciding specification, the whole range would sit at 19–20 bar and there would be no reason for the spread. The spread exists because these are genuinely different machines:

What to ask a supplier instead of asking for bar

Ask what the machine does when the puck is fresh and dense, not what it claims on the box. Then ask how many shots it pulls before the tank needs refilling, and how long the last shot of a full tank takes to recover.

Those three questions separate a $34 machine from a $199 machine far more reliably than any pressure figure on either.

Where to see our published range

All nine listings, with bar, wattage, tank volume, price and minimum order quantity, are on the price and MOQ reference. The coffee category page carries the same table with the commercial tiers broken out.

Where the figures behind this came from

Every number on this page traces to one of these.

Models this guide applies to

Coffee Makers

Primary line. Parts-intensive, so the spares plan is designed with the product.

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