October 24, 2026
Tech Supply Shed
October 24, 2026
,
Tech Supply Shed
Espresso Machine Pressure Explained: Do More Bars Mean Better Coffee?
More advertised bars do not automatically mean better espresso. A pump's maximum pressure and the pressure used during brewing are different things. The coffee bed, grind, dose, basket and machine controls all influence extraction. When comparing home machines, look for a coherent brewing system and a workflow you can repeat rather than choosing the largest pressure number on the box.
| Term | What it can tell you | What it cannot establish alone |
|---|---|---|
| Pump rating | A stated pump capability | Flavour or normal extraction pressure |
| Gauge reading | Model-specific operating feedback | A universal quality score |
| Basket design | How resistance is created | A suitable grind for every coffee |
Understand what the bar figure describes
A bar is a unit of pressure. On an espresso machine specification, a prominent number may describe the pump's capability rather than the pressure applied through the coffee during a normal shot. It is therefore an incomplete comparison. Ask where the number is measured and what operating condition it represents before treating two labels as equivalent.
Breville's own product information provides a useful example by distinguishing a 15-bar pump from approximately 9-bar espresso extraction on a particular machine. That does not establish one universal recipe for all equipment. It shows why pump rating and brewing behaviour must be read separately. A larger pump label alone tells you little about flavour in the cup.
9-bar extraction vs 15-bar and 20-bar pump ratings
| Pressure figure | What it describes | Buying implication |
|---|---|---|
| Around 9 bar during extraction | A brewing pressure specified for some machines, including the Breville example linked below. | Check the exact model's documentation. This is not a compulsory target for every recipe or machine. |
| 15-bar pump | A pump capability that can coexist with lower pressure during brewing. | Breville documents a 15-bar pump delivering 9-bar extraction on the Barista Express Impress. |
| 20-bar pump claim | A higher advertised pump figure, whose meaning depends on the manufacturer's measurement and controls. | It does not establish better flavour than a 15-bar machine. Compare brewing control, basket design and grinder suitability. |
These numbers describe different conditions, so they are not a good, better, best scale. Check whether the specification refers to pump capability or brewing pressure before comparing models.
The coffee bed provides resistance
Water needs a suitable path through the ground coffee. If the grind is too coarse or the dose does not suit the basket, water can run through quickly. If the grind is too fine or the basket is overloaded, flow can become restricted. The pressure reading, where a gauge is fitted, needs to be interpreted alongside the flow and result.
Do not try to improve an unpleasant shot by chasing a higher reading alone. Start with the basket's recommended dose range, fresh coffee and a repeatable preparation method. Change one variable at a time and taste the result. A balanced drink is the goal; a needle in a particular position is only one observation about the process.
Breville Bambino Plus Espresso Machine Stainless Steel
Compare this machine by its documented preparation and milk workflow, supplied baskets and grinder requirements. Do not select it solely from a pump-pressure number. Make sure the bench layout allows access to the water tank and routine cleaning points.
Pressurised and unpressurised baskets behave differently
A pressurised basket creates additional resistance through its design and can be more forgiving with some pre-ground coffee. An unpressurised basket relies more directly on the prepared coffee bed. Check which baskets are supplied and which the manufacturer recommends for the coffee you intend to use. Do not assume all baskets in similar-looking machines work alike.
If you want to learn espresso with freshly ground beans, budget for a grinder suitable for the task. Its ability to make controlled, repeatable adjustments matters. A machine upgrade cannot fully compensate for coffee ground at an unsuitable size. If convenience is more important, choose a workflow that matches that priority rather than purchasing a demanding setup you will rarely use.
For more on grind consistency and adjustment, read our burr vs blade coffee grinder guide. Check that any grinder you choose is suitable for espresso; a burr design alone does not guarantee the required adjustment range.
A gauge is useful when it is understood
Some machines have a pressure gauge and some do not. A gauge can help you recognise changes in your normal routine, but its location and interpretation are model-specific. Read the manual before deciding that a displayed number represents pressure at the coffee puck. Do not compare gauge positions across different designs as though they were a standardised taste test.
Keep simple notes on dose, beverage output and taste. Where timing is useful for your recipe, record it consistently. If the result changes, first look for a change in beans, grind, dose or preparation. That approach helps distinguish an ordinary adjustment from a machine problem and avoids unnecessary repairs prompted by one unusual reading.
Breville the Dual Boiler Espresso Coffee Machine, Sea Salt (BES920SST)
For several drinks, examine this model's exact brewing and steaming workflow and the controls you want to learn. Include grinder cost and maintenance supplies. A more elaborate machine is worthwhile when its capabilities match your routine and available space.
Compare workflow beyond the pump
Think about how many drinks you make together. Milk steaming, warm-up, control layout and space for cups affect the daily experience. A household making several milk drinks has different needs from someone preparing a single espresso before work. Check the exact machine's heating and brewing arrangement instead of inferring it from the price or pressure label.
The Bambino Plus, Dual Boiler and Dedica Duo are examples of different machine designs to compare by their documented workflow. Do not assume the same maintenance routine, accessories or operating sequence applies across them. Measure the bench space, including tank access and overhead clearance, and decide where the grinder and cleaning tools will live.
Troubleshoot flavour in a sensible order
If a shot tastes poor, begin with coffee freshness, dose and grind. Check that the basket and outlets are clean and the machine has been prepared according to its manual. Look at the drink's flow and taste before deciding the pump is weak. A blocked component or unsuitable preparation can mimic a pressure problem.
| What you notice | Possible cause | First practical check |
|---|---|---|
| Fast flow and a thin or sour drink | Grind too coarse, insufficient coffee for the basket, or uneven extraction. | Confirm the recommended dose and distribute evenly. With an unpressurised basket, try a small finer-grind adjustment while keeping dose and beverage output consistent. |
| Very slow flow or only drips | Grind too fine, an overloaded basket or a blocked outlet. | Stop the shot and follow the manual before removing the portafilter. Check cleaning and dose first, then try a slightly coarser grind if appropriate. |
| Bitter or drying flavour with slow flow | Excessive extraction, unsuitable grind or too much coffee for the basket. | Check the manufacturer's recipe and dose range. Try one small grind or beverage-output adjustment, then taste again. |
| Sour and bitter notes together, or inconsistent shots | Uneven preparation or water finding easier paths through the coffee bed. | Check distribution, level tamping and basket cleanliness before changing pressure settings. |
These are starting checks, not a diagnosis from taste alone. Roast, freshness, temperature and basket design also affect the result. Follow the exact machine's extraction guide, change one variable at a time and record dose, beverage output and taste.
Seek support if flow remains abnormal after approved cleaning and preparation checks, or if the machine leaks or behaves unexpectedly. Avoid internal adjustments or attempts to defeat pressure controls. The strongest buying question is not how many bars can it claim, but can this machine and grinder produce a repeatable drink with the effort I want to spend?
De'Longhi Dedica Duo Cold Brew Coffee Machine Black (EC890BK)
This compact alternative deserves its own manual and basket check. Compare the drinks you intend to make, control sequence and included accessories. Similar espresso terminology does not establish that its pressure behaviour or maintenance is identical to another brand.
Sources and further reading
- Breville explanation of pump and extraction pressure
- Breville Bambino Plus support and instructions
- Breville Barista Express extraction and troubleshooting guidance
Compare the relevant range before choosing:
Coffee Machines at Tech Supply Shed.
Frequently asked questions
Is 20 bar better than 15 bar?
Not as a general rule. Those numbers may describe pump capability and do not directly compare pressure during brewing, temperature control or the quality of preparation.
Does every espresso machine need a gauge?
No. A gauge is one tool, not a requirement for good coffee. Learn the controls and feedback available on the particular machine.
Can a finer grind fix every weak shot?
No. Dose, basket, freshness and preparation also matter. Excessively fine grinding can restrict flow, so make controlled changes and evaluate the drink.
Should I adjust the pump pressure myself?
Do not make unapproved internal modifications. Follow the manufacturer's operating and maintenance instructions and use qualified support when the machine behaves abnormally.
Choose the right setup for your needs
Explore coffee machines at Tech Supply Shed, compare the exact model details and choose the option that fits your routine.
