Pump technology: vibration or rotation

Differences and similarities

We often hear the question "What is the difference between a vibration pump and a rotary pump?" and we admit that it can be difficult to know. That is precisely why we have put together this article where we cover the subject and clarify what actually distinguishes the different pumps, as well as what similarities they have.

Vibration pump

The most common pump for home machines is the vibration pump. Using magnetism, a ball is moved back and forth to feed the water forward. A rattling sound from the pump is typical for this technology. The pressure is not adjustable on the pump, and they normally deliver around 15 bar. Many machines have a pressure regulator that levels the pressure to the correct 8-10 bar. In smaller and often slightly cheaper machines, a vibration pump is usually used, which takes 5-7 seconds before the pressure is "right" (you can hear the sound change).

Rotary pump

A rotary pump is the most common technology for professional machines. A motor drives the pump, which rotates. Most rotary pumps have an adjustment screw to regulate the desired pressure. Compared to a vibration pump, the rotary pump reaches the correct brewing pressure faster and has a quieter and smoother operation. The lifespan of espresso machines with a rotary pump is generally longer than those with a vibration pump. However, rotary pumps are larger and more expensive than vibration pumps, which is why they are not used very often in smaller machines.

Comparison

To put everything in context, we can look at the semi-pro espresso machines Appartamento and Cronometro R from Italian Rocket Espresso. The former has a vibration pump and the latter has a rotary pump. The advantage of the vibration pump in the Appartamento is that they have been able to reduce the size; however, it cannot be connected to the water mains, just like all our other semi-pro machines with a vibration pump. The advantage of the Cronometro R is its speed and quietness; however, the machine is slightly larger, but it can be connected to the water mains. So, one thing that accompanies the vast majority of semi-pro machines with a rotary pump is the ability to connect to water. Actually, the pump and the water connection are not linked, but the machines are often made with the same combinations (vibration-not water-connectable and rotary-water-connectable). In terms of taste, there is only a marginal difference between the espresso machines. Rotary pumps are a notch better, but it is barely noticeable. In terms of time, it takes a little longer for the Appartamento to brew due to its vibration pump, but it is a very small difference in time compared to the rotary pump in the Cronometro R.

So what should you choose?

What is "best" is hard to say off the bat; it simply differs from situation to situation. We recommend that you first look at what requirements you have—that is, whether there is a possibility for a water connection where the espresso machine is to be placed, how much the noise matters, and how much space you have to put the machine on. Then, of course, it is good to make a price assessment; as previously mentioned, espresso machines with a rotary pump are generally more expensive.