The E61 group head is the iconic espresso brew group, recognisable by its chrome dome and lever, and it matters because of how it keeps water temperature stable during brewing. Introduced by Faema in 1961, the E61 uses a thermosiphon system that continuously circulates hot water through the group, so the metal stays at brewing temperature and each shot extracts consistently. It also provides a natural, gentle pre-infusion. This guide explains what the E61 group is, how it works, why it matters for your coffee, and the real E61 machines Di Pacci stocks in New Zealand.
By Mik Di Pacci, Founder and CEO, Di Pacci Coffee Company. Technical explanations are general; machine details are drawn from live product listings and no personal lab testing is claimed.
Quick Summary
What it is: The E61 is a commercial-style espresso brew group, introduced by Faema in 1961, with a distinctive chrome body and lever.
How it works: A thermosiphon circulates hot water through the group so it stays at brewing temperature, and the design gives a gentle mechanical pre-infusion.
Why it matters: Temperature stability and pre-infusion support consistent, even extractions, which is why the E61 is a benchmark for prosumer machines.
Standard size: E61 groups use the industry-standard 58 mm portafilter, so accessories are widely available.
Consider: E61 machines usually need a warm-up and often a cooling flush on heat exchangers, and they are heavier and more of a commitment than compact home machines.
1961Faema Origin
ThermosiphonTemperature Stability
58 mmStandard Portafilter
Pre-InfusionBuilt In
In this guide
What is an E61 group head?
How the E61 works
Why it matters
Pre-infusion explained
The 58 mm standard
Pros and considerations
E61 machines at Di Pacci NZ
What you need alongside
FAQs
What Is an E61 Group Head?
The E61 group head is the brewing group at the front of many prosumer espresso machines, where the portafilter locks in and water is pushed through the coffee. It was introduced by Faema in 1961, which is where the name comes from, and its distinctive chromed brass body and actuation lever have made it the most recognisable group in espresso.
More than a style icon, the E61 is a specific engineering design. It is a large mass of chromed brass that stays hot and circulates water, and it uses a three-way solenoid or mechanical valve to release pressure after the shot. Machines built around it are generally serious, cafe-derived home machines rather than compact appliances.
How the E61 Works
The E61 works using a thermosiphon: hot water from the boiler continuously circulates up into the group and back, so the heavy brass body is held close to brewing temperature at all times. This passive circulation is the heart of why the E61 is prized, because a stable group temperature is one of the biggest factors in consistent espresso.
When you lift the E61 lever, water first enters gently before full pump pressure builds, creating a natural pre-infusion. After the shot, the group's valve releases pressure so the puck is left drier and easier to remove. The large thermal mass also means the group needs a proper warm-up before the first shot for best results.
Why the E61 Group Head Matters
The E61 matters because temperature stability and gentle pre-infusion both improve extraction, and it does this mechanically and reliably. Stable brew temperature means each shot extracts in a consistent window, so once you dial in a recipe it repeats. The built-in pre-infusion wets the puck evenly before full pressure, which can reduce channelling and produce a more even, balanced shot.
It is also a proven, serviceable standard. Because the E61 has been made for decades and is used across many brands, parts, seals and accessories are widely available, and the 58 mm portafilter it uses is the commercial standard. For buyers, that means a machine built around a known, upgradeable, long-lasting group rather than a proprietary one.
Pre-Infusion Explained
Pre-infusion is a short, gentle wetting of the coffee puck before full brewing pressure is applied. On an E61, this happens naturally as the lever opens and water eases in before the pump ramps up. Even saturation of the puck helps water flow uniformly through the coffee, which reduces channelling, the uneven flow that leads to sour or harsh shots.
Some E61 machines add programmable or flow-controlled pre-infusion for even more control. The practical takeaway is that the E61's pre-infusion is one reason its shots are often described as even and sweet, especially with fresh beans and a fine grind.
The 58 mm Standard
E61 groups use a 58 mm portafilter, the same size used on most commercial machines. This matters for buyers because 58 mm baskets, tampers, distribution tools and bottomless portafilters are widely available, so you are not locked into proprietary accessories. It also means skills and gear transfer between E61 machines and cafe equipment.
If you are buying accessories, look for 58 mm tampers and baskets to match an E61 machine.
Pros and Considerations
Pros
Excellent temperature stability from the thermosiphon.
Natural, gentle pre-infusion for even extraction.
Proven, serviceable, decades-old standard.
Uses the 58 mm commercial portafilter.
Widely available parts and accessories.
Considerations
Needs a proper warm-up before the first shot.
Heat exchanger E61 machines often need a cooling flush.
Heavier and larger than compact home machines.
A serious purchase, usually without a grinder included.
E61 Machines at Di Pacci NZ
Di Pacci stocks many E61 machines in New Zealand, across heat exchanger and dual boiler designs. Prices are indicative; check each product page for current pricing.
The E61 is a commercial-style espresso brew group introduced by Faema in 1961, with a distinctive chromed brass body and lever. It circulates hot water through the group for temperature stability and gives a natural pre-infusion.
Why is the E61 group head so popular?
It combines excellent temperature stability, built-in pre-infusion, a proven serviceable design and the 58 mm commercial portafilter standard. That mix of consistency and longevity makes it a benchmark for prosumer machines.
How does an E61 group stay at temperature?
It uses a thermosiphon that continuously circulates hot water from the boiler through the heavy brass group and back, keeping the metal near brewing temperature so shots extract consistently.
What is pre-infusion on an E61?
Pre-infusion is a gentle wetting of the coffee puck before full pressure. On an E61 it happens naturally as the lever opens and water eases in, which helps even extraction and reduces channelling.
What portafilter size does an E61 use?
E61 groups use the industry-standard 58 mm portafilter, so 58 mm baskets, tampers and accessories are widely available and interchangeable.
Do E61 machines need a warm-up?
Yes. The E61's large brass mass needs a proper warm-up before the first shot for best temperature stability. Many owners leave the machine on or use a timer to be ready.
What is a cooling flush on an E61?
On heat exchanger E61 machines, a cooling flush is running a little water through the group before a shot to bring the brew temperature into range. Dual boiler E61 machines with PID generally do not need it.
Is an E61 machine good for beginners?
E61 machines suit keen beginners and experienced baristas alike, but they are serious machines that reward learning, and they usually need a separate grinder. They are not one-touch appliances.
Are E61 machines heat exchanger or dual boiler?
Both. The E61 is a group head used on heat exchanger machines like the Rocket Appartamento and ECM Technika, and on dual boiler machines like the Bellezza Bellona and Francesca.
Do E61 machines come with a grinder?
Usually not. Most E61 espresso machines are sold without a grinder, so budget for a separate espresso grinder, which matters as much as the machine for shot quality.
Prices and specifications may change. Always confirm current price, availability and specifications on the live product pages before purchasing. Technical explanations are general and no independent laboratory testing is claimed.
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