Almost every domestic espresso machine uses a vibration pump: an electromagnet oscillating a piston at mains frequency. It is cheap, compact and reliable, and it buzzes loudly at 50 or 60 Hz. That noise is normal and it is not a fault.
Commercial machines use rotary pumps, which are much quieter, considerably more expensive and physically larger. A few prosumer machines offer them.
When the noise is telling you something
A sudden change in pitch or volume is worth investigating.
Low water. A pump drawing air is much louder and harsher than one moving water. Check the tank first, every time — this is the most common cause of a machine that suddenly sounds terrible.
An airlock. After refilling an empty tank, the pump may need to prime. Run water through the steam wand or the hot-water tap for a few seconds to clear it.
Scale. A restricted flow path makes the pump work harder and sound strained. If the noise has increased gradually over months alongside slower shots, descale.
A loose tank or drip tray rattling in sympathy with the pump. Irritating, harmless, and fixed by reseating it.
Grinder noise is separate
Grinders are louder than machines and there is a real difference between models. Eureka’s Silent Technology and similar systems genuinely reduce it — a low whirr rather than a shriek — which matters more than it sounds if you grind before anyone else is awake.
Reducing what you can
A silicone mat under the machine damps vibration transmitted into a worktop, which is often more of the perceived noise than the pump itself.
Questions people actually ask
Is a rotary pump worth paying for?
For a home machine, rarely. It is quieter and smoother and adds substantial cost and size. It matters in a cafe pulling shots continuously.
My machine screams during steaming — normal?
Steam through a narrow tip is loud by nature. A change in the sound, or spluttering with water rather than dry steam, suggests the boiler has not reached temperature.
Last reviewed 8 August 2026