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Buying a New Coffee Machine - Understanding Specifications


Have you ever walked into a coffee shop and marveled at the gleaming Italian espresso machines with their shiny chrome, black, and timber finishes? You're not alone. Many coffee enthusiasts are drawn to these beautiful machines, but when it comes to choosing the right one for your home, the array of technical specifications can be overwhelming. In this blog post, we'll unravel some of the mysteries surrounding espresso machines, specifically the difference between vibration pumps and rotary pumps and what other features you should consider when selecting your next home espresso machine.

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Understanding the Basics

To begin, it's important to recognize that while various espresso machines may look similar from the outside, it's what's inside that truly matters. A significant factor that distinguishes espresso machines is whether they are equipped with a vibration pump or a rotary pump.

  1. Vibration Pump:

A vibration pump is a compact and affordable pump commonly found in entry-level coffee machines. When activated, it uses magnets to move a shaft, drawing water from the machine's tank into the brewing head. However, vibration pumps have limited flexibility, as they cannot adjust pressure or connect to a mains water supply. This means you must rely on the built-in water tank for brewing.

  1. Rotary Pump:

Rotary pumps, on the other hand, are more sophisticated and versatile. These pumps are driven by an electric motor and can be found in higher-end espresso machines. Rotary pumps offer better control over pressure and can be connected to mains water, ensuring a consistent supply of filtered water. This feature prevents mineral buildup and guarantees excellent water quality.

Differentiating Between Pumps

You can easily determine whether a machine has a vibration or rotary pump by looking at the gauges:

  • A machine with a single gauge measuring pressure from 0 to 3 typically has a vibration pump.
  • A dual gauge machine with one gauge measuring steam pressure and the other measuring pump pressure (ranging from 0 to 9) usually features a rotary pump.

Exploring Temperature Control: Pressure Stat vs. PID

Temperature control is crucial for brewing a perfect espresso. Entry-level machines typically employ a pressure stat—a copper pin with a spring that maintains a set temperature. In contrast, higher-end models use a PID (Proportional-Integral-Derivative) system, which is a digital probe with a circuit board, allowing precise temperature adjustments. PID-controlled machines are favored for their ability to fine-tune brewing temperature, ensuring consistency in your espresso.

Shot Timer and Noise

When selecting an espresso machine, consider whether it includes a shot timer. Some high-quality machines with PID systems incorporate a shot timer for added convenience. Noise levels also vary between vibration and rotary pumps, with the latter generally being quieter. If you're concerned about disturbing others in your household, a rotary pump might be the better choice.

Power and Boiler Size

Power consumption and boiler size can impact the machine's performance. Espresso machines can range from 1400 to 1800 watts. Lower-wattage machines may feature smaller elements or more efficient insulation. Boiler size is typically 1.4 to 1.8 liters, with half used for hot water and half for steam. A smaller boiler may require more recovery time between consecutive shots.

Water Tank Capacity

Most quality machines come equipped with a 3-liter water tank, ensuring an ample water supply. It's advisable not to opt for machines with tanks smaller than this standard.

Consider Styling and Additional Features

Finally, consider the aesthetics and extra features that suit your preferences. Brands like Quick Mill and Rocket offer various styling options, such as stainless steel, black, timber, or white finishes. Some models include cool-touch steam wands or larger group handles.


Choosing the right Italian-style coffee machine for your home comes down to understanding your needs and preferences. Once you've grasped the differences between vibration and rotary pumps and considered other features, you can make an informed decision. Whether it's a Quick Mill, Rocket, La Marzocco, Sanremo, Breville, Sunbeam or any other brand, the key is to find the machine that aligns with your coffee-making goals. If you have any further questions or need clarification on specific specs, feel free to ask.

Happy brewing!

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