Espresso Machine Parts: What Each One Does and How to Look After It
Knowing the parts of your espresso machine makes it much easier to clean it properly, spot problems early and explain a fault to a technician. You don’t need to repair the machine yourself, but you should know what each part does and what it looks like when something is wrong.
This guide covers the parts of a typical commercial espresso machine, what each one does, and what to watch for. Your machine’s manual comes first for anything specific to your model.
How water moves through the machine
Seattle Coffee Gear explains the basic path: water comes from a reservoir or a water line, is heated in the boiler, and is pushed by the pump through the group head at about 9 bars of pressure. That pressure forces the water through the coffee in the portafilter, and espresso comes out of the spouts.
Beans made for espresso and milk drinks
For lattes, cappuccinos and iced coffee, try our Arabica-Robusta Blend or bold Robusta, roasted daily and ground to order for espresso or moka pot.
Shop the Blend →The brewing parts
| Part | What it does | Watch for |
|---|---|---|
| Group head | Where the portafilter locks in and water flows onto the coffee | Uneven water flow |
| Group gasket | A rubber ring that seals the portafilter to the group head | Water leaking around the portafilter, or the handle turning further than usual |
| Shower screen (group screen) | Spreads water evenly over the coffee | Coffee residue or blocked holes |
| Portafilter | The handle that holds the basket of coffee | Damage, wear or leaks |
| Portafilter basket | The metal filter that holds the ground coffee, in single and double sizes | Blocked holes, dents |
| Portafilter spring | Holds the basket in place inside the portafilter | A basket that falls out when knocking |
| Dispense button or keypad | Starts the shot, or a set volume on automatic machines | Shots that stop at the wrong volume |
Espresso Parts advises replacing the gasket when the portafilter leaks, and notes that the basket and gasket are often best changed together. They also recommend cleaning the shower screen often and replacing it when it’s clogged or worn.
Inside the machine
| Part | What it does | Watch for |
|---|---|---|
| Boiler | Heats water for brewing and makes steam. Some machines have separate boilers for each | Slow heat-up, low steam |
| Pump | Pushes water through the coffee at brewing pressure | Pressure reading lower than normal during a shot |
| Pressure gauge | Shows boiler pressure and pump pressure, often with two needles | Readings that are unusually high or low |
| Sight glass | Shows the water level in the boiler, between minimum and maximum marks | Water level outside the marks |
| Water filter or softener | Treats the water before it enters the machine | Overdue cartridge changes |
The pressure gauge is your quickest health check. Learn what yours normally reads during a shot, so you notice when it changes. Our guide to water for espresso machines explains why the water filter matters so much.
Steam and hot water
| Part | What it does | Watch for |
|---|---|---|
| Steam wand | Steams and textures milk | Weak steam, dried milk on the wand |
| Steam tip | The holes at the end of the wand that spread the steam | Blocked holes |
| Hot water tap | Dispenses hot water for Americanos and tea | Dripping or spitting |
Purge and wipe the steam wand before and after every use. Our lesson on how to steam milk shows how.
The grinder
| Part | What it does | Watch for |
|---|---|---|
| Bean hopper | Holds the beans above the burrs | Oily residue, old beans |
| Burrs | Two cutting surfaces that grind the coffee to size | Inconsistent shots, more fine powder, shot times drifting |
| Grind adjustment | Sets how fine or coarse the coffee is ground | A setting that won’t hold |
| Doser (on some grinders) | Holds ground coffee before it’s dispensed | Stale grounds left inside |
Espresso Parts notes that burrs dull with regular use and should be replaced when grind quality and shots become inconsistent.
Daily and regular care
TESDA’s barista standard lists these maintenance tasks, which match what most manufacturers ask for:
- Backflush the machine with food-grade cleaner, the way your machine’s manual describes
- Check the group head, gasket and portafilters regularly
- Soak portafilters and baskets in hot water to remove coffee oils
- Brush the group head and shower screen at the end of the day
- Clean and wipe the steam wand with a clean, damp cloth
- Check the water softener or filter regularly
- Brush out the grinder and wipe the hopper
Seven Miles suggests a general service about every 6 months, when wear parts such as gaskets and shower screens are replaced, and a major service every 1 to 2 years. Our espresso machine cleaning lesson has a full daily and weekly routine, and the opening and closing checklist shows where it fits in a shift.
Choosing a machine?
If you’re buying, see our guide to commercial espresso machines in the Philippines and the coffee shop equipment list. Cafés buying 10 kg or more of coffee can see wholesale pricing. More lessons are in the Caffeine Brothers Coffee Academy.
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