For many, the La Marzocco GS3 AV is considered one of the best espresso machines for home use – or simply “the GS3,” as it is affectionately known in professional circles. As testers, we were also excited: Michel had a GS3 model in his kitchen for many years, and I use a GS3 AV for coffee catering on our coffee bike. We have therefore tested the machine in both everyday home use and under tough real-world conditions at events. A heads-up: In many respects, the GS3 confirms its legendary reputation, but it does not impress across the board. In the following review, we will examine the strengths and weaknesses of the GS3 AV and take a close look at who this machine is actually suitable for.
Buying the La Marzocco GS/3 AV
The following specialist retailers distribute the La Marzocco GS/3 AV, and we can recommend purchasing a machine from these companies. They all offer the option of adjusting the machine's offset.
Germany: [Partner links] Stoll Espresso
Switzerland: [Partner links] deon
We look for specialist partners for you that we know provide good work and good service. We are in close contact with these dealers. These are affiliate links. If you order via this link, it costs you no more, but we receive a small commission that we put into new test equipment. We are continuing our search for competent partners for you in the DACH region.
Build Quality and Value
The build quality of the GS3 AV leaves little to be desired. La Marzocco has consistently used professional components in its construction – the very same parts found in their commercial machines like the GB5 or Strada. Compromises? None to be found. The result is a single-group espresso machine that feels more like a full-sized commercial powerhouse. The frame and chassis are predominantly made of solid stainless steel, which you can not only see but also feel: the GS3 weighs in at around 33 kg – you can tell immediately that quality sometimes means weight.
Inside, professional technology is at work: two generously dimensioned stainless steel boilers (brew boiler 1.5 liters, steam boiler 3.5 liters) as well as a saturated group head for optimal temperature stability. This dual-boiler configuration comes directly from its big sister, the Strada, and ensures constant temperatures and abundant steam power. The housing feels robust and durable. The only minor drawback in terms of quality might be the side panels: as standard, these are made of black plastic. Given the price, we would have liked to see solid metal here – although La Marzocco does offer stylish glass sides or wooden panels as an option. Regardless: there is hardly any questioning the fundamental build quality of the GS3. Everything feels solid and high-quality, from the smooth valves to the thick stainless steel drip tray with a plastic inlay. This machine is quite clearly built to last for decades while producing thousands of espressos.
Side view of the La Marzocco GS3 AV.
Usability and New IoT Control
The usability of the GS3 AV is a double-edged sword. On one hand, it offers the experienced barista numerous setting options: via the digital display, the brew temperature (PID-controlled) and shot volume can be conveniently configured, and a shot timer helps with extraction control. The AV version (auto-volumetric) allows the desired amount of water per shot to be precisely programmed – afterwards, a push of a button always delivers a reproducible amount of espresso. This volumetric dose control is worth its weight in gold when you are frothing milk or preparing multiple drinks in a row. In the hectic pace of a catering environment, we enjoyed being able to briefly attend to other tasks thanks to the automatic system while the GS3 stopped the brew independently.
On the other hand, you can tell that the GS3's concept originates from the 2000s. The menu navigation on the small display is functional but a bit old-fashioned. Those used to modern touchscreens will have to scroll through nested menus here – it is not exactly intuitive. On the plus side, the machine responds promptly to inputs and changes, and thanks to PID, the temperature can be adjusted in fine increments. New to the system (and one we naturally tested) is the IoT control via the La Marzocco app. Via Wi-Fi and smartphone, you can now operate the GS3 remotely – for example, by programming timers for switching it on and off. We used this immediately: being able to turn the machine on from bed early in the morning is a luxury you quickly learn to appreciate. This way, the GS3 is preheated when you shuffle into the kitchen sleepy – and you save yourself the wait time. Temperature settings or brewing parameters can also be changed comfortably via the app. However, it must be stated clearly: this new IoT gadget only slightly improves usability and does not essentially change the basic concept of the machine. Despite the app, the GS3 remains a work tool, not a high-tech toy. Those who were comfortable with the menu navigation before will be happy with the app as a nice add-on; however, those who generally find the machine a bit sluggish in its handling will not be turned into a fanboy by IoT. At least, the programming and preheating via app mitigates one of the biggest points of criticism – the long heat-up time.
Heat-up Time and Power Consumption
Let's move on to the tangible disadvantages of the GS3 AV: energy hunger and heat-up duration. This is where the machine's professional heritage shows its flip side. In our test, our GS3 required around 30 minutes to reach full temperature (group head, both boilers, housing heated). Although La Marzocco officially advertises a heat-up time of approx. 15 minutes, this figure is likely very optimistic – perhaps it refers to the time until the boiler target temperature is reached. In practice, it takes about twice as long for the temperature in the saturated group head to stabilize and for the machine to be truly shot-ready. A half-hour warm-up is an eternity in the life of a home barista, especially since many more modern machines (e.g., instantaneous water heaters or lighter dual boilers) are ready much faster. Here, you pay the price for the solid metal components and the large boilers. Anyone wanting a spontaneous espresso in the morning must plan ahead – or simply leave the GS3 on constantly.
The latter is not an ideal piece of advice, however, because in our test, the GS3 AV had the highest power consumption of all single-group espresso machines tested so far. It consumed 0.6 kWh for heating and pulling 5 double shots, which is approximately six times that of a smaller thermoblock machine like the Ascaso Steel Duo PID. Even in standby mode, it continuously draws power to keep the 1.5 liters of brew water and 3.5 liters of steam water hot. The GS3 is therefore a true high-consumer on the electricity meter – it takes what it needs without worrying about the power bill. At least there is a programmable Eco mode or Half Power mode, which, for example, only heats one boiler or throttles the output. In everyday life, however, that only helps to a limited extent: either you accept the increased consumption, or you consistently turn off the machine after use and use timers/IoT to preheat it in time. We stuck to a middle path – planning and preheating – because leaving the GS3 running all day would be an expensive pleasure at today's electricity prices. This thirst is reflected in our rating accordingly: heat-up time and power consumption are among the weak points (30 minutes ~ 3.5/10; very high consumption ~ 2/10 points).
Graphic from 2021
Temperature Stability During Espresso Extraction
Let's turn to more pleasant aspects: the temperature stability and the espresso potential of the GS3. Thanks to its saturated group head design and PID control, the GS3 keeps the brew temperature impressively constant – especially over many shots. In our stress test, we pulled 30 espressos at one-minute intervals. The result: no significant performance fluctuations; the temperature rose by a maximum of 1 °C over all shots. The 1.5-liter brew boiler does not falter even under continuous fire. In short: the GS3 is a workhorse that delivers an almost constant temperature even in continuous use. In quantitative measurements according to the WBC protocol, the temperature fluctuation was a tiny 0.61 °C, and according to our KM protocol, it was also an excellent 0.84 °C immediately after heating up. These are values that we classify as “very good.” As such, the GS3 plays in the top league of espresso machines when it comes to temperature consistency.
But, and here comes the critical barista perspective: during a single shot, the GS3 shows a slight tendency toward temperature-related “drift.” We were able to confirm what we had heard before – during an espresso extraction, the water temperature rises slightly, by up to about 1°C from the first drop to the last. Now, one has to be fair: 1–1.5 °C is no drama in everyday life – most coffee drinkers will not notice it. We mention it for the perfectionists and tech nerds who want to have every aspect under control. The bottom line remains: for consecutive shots, the GS3 is unbeatably stable; only those who scientifically dissect every shot individually will discover this minimal increase.
In the espresso cup, the GS3 AV consequently delivers what one expects from a machine of this class: excellently extracted shots with a rich aroma and finely nuanced flavor profiles. The combination of constant brew temperature, rich 9-bar pressure from the internal rotary pump, and volumetric precision ensures reproducible results at café level.
Every espresso we prepared with the GS3 was at least very good, and many were excellent. Crema, texture, sweetness – all there, as long as the beans and grinder are up to the task.
So why only 9/15 points in espresso potential? Well, the GS3 AV doesn't quite reach the last points for absolute espresso perfection because there are still machines that have additional refinements. For example: the GS3 MP (Manual Paddle) or other high-end devices with pressure profiling offer the possibility to manually control the pressure curve and pre-infusion. With this, you can squeeze out a few extra percentage points of extraction from some coffees, which is not possible with the purely volumetrically working GS3 AV with a smooth 9-bar profile. Furthermore, the mentioned slight temperature rise during extraction remains a minimal blemish. Don't get us wrong – the GS3 AV makes grand espresso, and the limiting factor in 99% of cases is the person at the portafilter, not the machine. But for the full 15 points, it lacks that very last bit of fine-tuning compared to truly uncompromising “espresso laboratories.” For constant extraction with a 9-bar profile, the GS 3 AV is the benchmark for almost everything. However, in terms of flexibility, it cannot keep up with profile-controlled machines.
Steam Unit and Milk Frothing
When it comes to milk frothing, the GS3 AV shows what it can do with its huge steam boiler. The steam boiler holds a full 3.5 liters – a value that no other single-boiler machine reaches. In practice, this means: steam without end, and it is powerful and dry. The GS3 blows the steam so forcefully through the four-hole steam nozzle that it is a joy. We were genuinely astonished at how fast even larger 0.6-liter milk jugs were brought to temperature and a fine microfoam texture, specifically in 19 seconds. Frothing a 300 ml milk jug? The GS3 does it in a few seconds, and there would probably still be room for improvement. This steam power is absolutely “at a commercial level” – frothing large amounts of milk one after the other is a breeze for this machine. In home use, you have to be careful: those coming from a smaller machine will be surprised by the intensity of the steam. Here, it is a matter of practicing or turning down the pressure so as not to accidentally get the milk too hot or too foamy because the GS3 works mercilessly efficiently. Once you have the hang of it, the GS3 conjures up dreamlike milk foam in barista quality: velvety, fine-pored, and beautifully shiny, perfect for latte art.
A nice bonus is the high-quality finish of the steam wand itself. It is made of stainless steel, is fully articulated (360° swiveling), and is insulated as a “no-burn” wand. This means you can safely touch it even after steaming without burning your fingers – a blessing for scatterbrains like me who often clean the machine while frothing and inadvertently touch the wand. Naturally, the GS3 also has a hot water outlet that uses a mixing valve to mix hot boiler water with a bit of fresh water. This way, you get, for example, 90 °C for tea or Americano, which is cooler than boiling water, and this works very well in practice. Such details show that the GS3 thinks along with the user and aims to offer comfort.
In total, we award 8/10 points for frothing quality. The performance of the steam unit is unique. So why not 10/10? Because in 2025, we have arrived in an age of automatic steam wands that independently serve very good milk foam quality with temperature probes in the tip. They are less powerful and usually falter, but for home use, this is still an exciting additional option for many home baristas. We additionally evaluate the strength and power of the GS3 AV's steam delivery in the category of commercial, volume, and catering performance.
Volume Potential and Catering Suitability
Now we come to the core topic of the GS3 AV: its area of application. We hinted in the title that this machine plays out its greatest strengths outside of the usual home barista routine. The GS3 was not originally designed as a classic household machine, but as a compact commercial or catering machine. All components, volumes, and performance data are designed to produce many espressos in a row in consistent quality. And that is exactly what it does – almost unflinchingly. Our own GS3, which we use for events, is the best example: for almost 8 years, we have been sending it to trade fairs, weddings, and street festivals. There, it must easily pull 300–400 espressos in one day – and it still does it as reliably as on the first day. That is a tough challenge, and yet the machine shows no significant signs of aging. Neither have we noticed any conspicuous performance losses, nor have we had to carry out major repairs. And if a component does give up the ghost, it can be quickly replaced thanks to the modular design – the GS3 is made to run forever.
We honor this volume and catering potential with 10/10 points. In practice, this means: for a small coffee truck, the coffee bar at the weekly market, or as a second machine in a small roastery, the GS3 is ideal. It can be operated with fixed water (or via the internal 2.5 L tank if necessary) and, thanks to the rotary pump, can also be connected to the drain – a real relief in continuous operation so that you don't have to worry about the water tank and drip tray. The temperature remains stable over dozens of shots, the steam reserve seems inexhaustible. We can prepare so many drinks in a short time with one GS3 that we run out of breath sooner than the machine does. In our coffee mobile, it has shown many an astonished guest what a single brew group can do when it comes from La Marzocco.
All these hymns of praise, however, have one crucial catch: at home, very few will ever need this potential. In the home barista context, the GS3 AV is simply and plainly oversized. Anyone making two espressos in the morning and maybe a cappuccino in the afternoon is only scratching the surface of what this machine was built for. The greatest weakness of the GS3 therefore lies in a misallocation: it is capable of an incredible amount – more than a home user ever needs – and has to accept compromises in return (power consumption, heat-up time, price). You pay a high price for skills you barely call upon in everyday life. That is exactly why our conclusion is nuanced: for ambitious home baristas with a large budget and professional standards, the GS3 AV can, of course, be a dream. It is also fun to operate such a precision tool, and with every shot, you feel the reserve and stability that lies dormant in the machine. But from a purely rational perspective, it is often “too much” for pure home use.
Accessories and Scope of Delivery
A quick look at the topic of accessories: here, La Marzocco is unfortunately stingy – and that flows into our rating (3/10 points). In view of the purchase price starting from 6900 Swiss francs or 7600 euros for the GS3 AV, we would have expected a somewhat more extensive or higher-quality accessory package. In the box, there is only the bare necessity: a double-spouted and a single-spouted portafilter, four portafilter baskets (7 g, 14 g, 17 g, 21 g), a blind basket for backflushing, a simple tamper made of stainless steel, cleaning powder, a water hardness test kit, and a fixed water connection kit. Don't get us wrong – this is solid and lacks no essential component. But “premium” feels different. For example, you look in vain for a bottomless portafilter, which other manufacturers in this price class often include. Also, the included tamper is made of metal, but is rather simple and no comparison to the noble precision tampers that many home baristas use today. No milk pitcher, no knock box, no further gimmicks – La Marzocco could certainly have been a bit more generous here to bundle a worry-free package for the buyer. As it is, you still have to buy a few extras to complete the setup.
Conclusion: Who is the GS3 AV worth it for?
The La Marzocco GS3 AV is without question an exceptional machine. In our test under real-world conditions, it impressively showed what it is made of: first-class espresso quality, incredible performance over long series of shots, robust construction, and steam performance at a professional level. As a home barista, you feel almost like a small café owner with the GS3 – you can, if you want, supply an entire group of people with cappuccino in a short time without the machine batting an eye. This machine conveys the cozy feeling of unshakable stability and reserve. Its charming retro design with modern inner values, which certainly adorns many a kitchen decor (provided the massive device finds space), matches this as well.
At the same time, one must soberly note that the GS3 AV is only really sensible for home use in very special cases. The machine's biggest plus points – its throughput strength and long-term durability – hardly come into play in normal household use. Instead, you have to manage the mentioned disadvantages: you need patience for heating up, accept a very high power consumption, and invest a huge sum of money. Our price-performance ratio in home operation is accordingly drastic: we award just 1.2/10 points here. Put another way: you pay primarily for the brand name and the professional reserves, less for the fact that your own espresso would be better than with a machine half the price. Anyone looking purely at the espresso quality for a few shots a day will be on par with much cheaper devices – simply because the GS3 cannot flex its muscles due to a lack of opportunities.
Nevertheless, there is a niche where the GS3 AV shines: semi-professional applications. For passionate hobby baristas who regularly cater to larger coffee groups (keyword: the whole family and neighborhood on the weekend), or for business operators with limited space (e.g., delicatessens, bars, or mobile coffee stands), the GS3 is a fantastic solution. It combines the performance capability of a commercial espresso machine with the size and handling of a household machine. In this context, the investment also pays for itself much sooner – we ourselves have experienced that our GS3 paid for itself within a year through income from catering. And the lifespan of a GS3 is measured in decades, not years.
Our tip: think carefully about what kind of “coffee person” you are. If your heart beats faster at the thought of enjoying every facet of espresso preparation with a genuine La Marzocco, and if the mentioned weaknesses play a minor role for you, then you will be very happy with the GS3 AV. It does demand something from you (electricity, space, money, and commitment), but it also gives back an incredible amount. Daily use just feels professional – and that has its own unique appeal. If, on the other hand, you are primarily interested in the result with reasonable effort and maybe only drink a few cups a day, the GS3 can even be somewhat frustrating because its potential lies fallow and it seems rather cumbersome in everyday life. In that case, you are probably better advised with a smaller dual-boiler machine or a good heat exchanger.
Summarized rating La Marzocco GS3 AV: (Status test 2025)
- Build quality: 8/10
- Accessories: 3/10
- Usability: 5.5/10 (without IoT)
- Volumetrics (auto. dosing): 9/10
- Temperature stability: very good (WBC protocol: 0.61 °C; KM protocol: 0.84 °C)
- Heat-up time: approx. 30 min. (3.5/10)
- Power consumption: very high (2/10)
- Frothing quality: 8/10
- Espresso potential: 9/15
- Volume: 3/5 (~60 dB)
- Price-performance: 1.2/10
- Volume/Catering potential: 10/10
