KOIOS EM621 Espresso Machine: A Compact Yet Powerful Coffee Maker for Home Baristas

Published on Sept. 15, 2023, 2:49 p.m.

With its compact yet powerful performance, the KOIOS EM621 20 Bar Semi-Automatic Espresso Coffee Machines allows home baristas to craft café-quality espresso drinks in their own kitchen. This semi-automatic espresso machine features a 20 bar pressure Italian pump, PID temperature control, and a 58oz removable water tank, providing robust brewing capabilities without occupying excessive counter space. But how does it actually perform for daily home use? This review provides an in-depth assessment.

Key Features:

  • 20 bar pressure for optimal espresso extraction
  • 58oz detachable water tank
  • Stainless steel construction
  • Steam wand for foaming milk
  • Single and double shot modes
  • Removable drip tray
  • 1200W power

Technical Specifications and Advanced Features

The KOIOS EM621 Espresso Machine is a testament to modern engineering in coffee making. Equipped with a 1200W heating element, it ensures rapid and consistent heating for your espresso. The machine’s ability to operate at a pressure of 20 bar, equivalent to the pressure used in professional coffee shops, guarantees an optimal extraction of flavor and aroma from the coffee beans.

This espresso machine offers a versatile experience with its 3 extraction choices, including settings for 1 cup, 2 cups, and Americano, accommodating different preferences and occasions. The PID temperature control system is a critical feature, providing precise control over the brewing temperature, which is vital for achieving the perfect espresso shot.

Moreover, the 58oz water tank is designed for convenience, minimizing the need for frequent refills and making it suitable for serving multiple guests or personal indulgence in multiple espresso shots. The machine’s design incorporates stainless steel, which not only gives it a sleek, modern look but also ensures durability and ease of cleaning.

Incorporating these technical specifications and features, the KOIOS EM621 offers a comprehensive coffee-making experience, blending convenience with the art of espresso making.

 KOIOS EM621 20 Bar Semi-Automatic Espresso Coffee Machines

Design and Build Quality

Sporting a stylish stainless steel exterior, the KOIOS EM621 20 Bar Semi-Automatic Espresso Coffee Machines looks sleek and modern. The machine feels solidly constructed, with metal parts that seem durable. Buttons provide tactile feedback when pressed, and the portafilter locks into place with a reassuring click. At 11.6 x 11.6 x 6.3 inches, the unit’s footprint is compact enough for small kitchens.

Ease of Operation and User-Friendly Interface

The user interface of the KOIOS EM621 Espresso Machine is designed with simplicity and intuitiveness in mind. The clearly labeled buttons and responsive controls make it straightforward to select your desired coffee type or brewing function. Whether you’re a novice or an experienced barista, this machine allows for easy operation without compromising on the quality of the espresso produced. Its user-friendly design ensures that you can enjoy your favorite espresso beverages with minimal effort and maximum satisfaction.

 KOIOS EM621 20 Bar Semi-Automatic Espresso Coffee Machines

Features and Controls

With its intuitive interface, the KOIOS EM621 20 Bar Semi-Automatic Espresso Coffee Machines makes it easy to brew espresso, steam milk, and dispense hot water. The highlight is the 20 bar Italian pump, which allows for excellent extraction and crema. PID temperature control helps ensure consistent results. Users can pull 1 or 2 shots at a time, and there’s a handy Americano function that adds hot water to dilute espresso. The steam wand heats up quickly and can produce silky microfoam.

 KOIOS EM621 20 Bar Semi-Automatic Espresso Coffee Machines

Performance and Functionality

In testing, the KOIOS EM621 20 Bar Semi-Automatic Espresso Coffee Machines consistently delivered flavorful shots with rich, golden crema. The machine heated up rapidly, in around 30 seconds. With proper technique, the steam wand frothed milk for cappuccinos and lattes in under a minute. Flow control would be a nice addition, but overall the KOIOS EM621 20 Bar Semi-Automatic Espresso Coffee Machines brewed and steamed excellently. The 58oz tank capacity minimizes refilling needs.

Users have consistently reported that the KOIOS EM621 not only meets but often exceeds their expectations in terms of espresso quality, highlighting its ability to consistently produce espresso that rivals that of high-end coffee shops.

Ease of Use and Cleaning

Despite its many features, the KOIOS EM621 20 Bar Semi-Automatic Espresso Coffee Machines remains approachable for beginners. The manual provides clear instructions and brewing tips. Maintenance is straightforward, with removable, dishwasher-safe parts. The drip tray can accommodate taller cups. While not silent, the pump noise is reasonable. One downside is the lack of an automatic cleaning or descaling function.

Noise Level

The pump and brewing process of the KOIOS EM621 20 Bar Semi-Automatic Espresso Coffee Machines does produce audible noise. While not excessive, some users note the pump sound is louder than expected, especially on startup. The noise may be noticeable in compact kitchens. However, many owners feel the pump volume is comparable to similar home espresso machines.

 KOIOS EM621 20 Bar Semi-Automatic Espresso Coffee Machines

Ideal Use Cases

The KOIOS EM621 Espresso Machine is the perfect companion for coffee enthusiasts who appreciate the art of espresso making. Whether you’re starting your day with a robust espresso, entertaining guests with a variety of coffee creations, or simply enjoying a moment of quiet indulgence, this machine is designed to cater to your every coffee need.

User Feedback Analysis

Digging deeper into customer reviews reveals more nuanced insights into the real-world performance and experience of using the KOIOS EM621 day after day:

  • Seasoned home baristas say the KOIOS EM621 20 Bar Semi-Automatic Espresso Coffee Machines, with its 20 bar pump pressure and PID temperature control, extracts espresso on par with much more expensive machines. The rich crema and layered flavors live up to its promise.

  • While power and consistency impress owners, many note the machine’s compact footprint as a major advantage. It saves precious counter space without sacrificing features or quality.

  • Beginners appreciate how the straightforward controls and detailed manual enable brewing quality espresso drinks with minimal learning curve. The process feels approachable, not intimidating.

  • Users highlight the steam wand’s quickness and ability to froth milk into a silky microfoam texture. Cappuccinos and lattes are elevated to cafe quality at home.

  • Some report the durability could be improved, with problems like faulty pumps arising after a year or so of frequent daily use. The warranty provides some peace of mind.

  • Despite some noise, most find the pump volume acceptable and feel it’s comparable to similar home espresso machines in this class.

  • While automatic cleaning would be welcomed, owners say manually rinsing the KOIOS EM621 20 Bar Semi-Automatic Espresso Coffee Machines’s detachable parts is simple and effective.

In summary, feedback indicates the KOIOS EM621 20 Bar Semi-Automatic Espresso Coffee Machines reliably produces exceptional espresso drinks, with advanced features rivaling pricier machines. Convenience, ease of use and a small footprint satisfy home baristas. But minor durability and noise concerns exist.

Pros and Cons

- Compact, attractive design
- Excellent 20 bar pressure extraction
- PID temperature control
- Easy to use controls
- Convenient 58oz water tank
- Quick steaming performance
- Solid value for the price

- Lacks flow control
- No auto cleaning/descaling
- Pump is audible


Given its robust performance, solid build quality and array of features, the KOIOS EM621 20 Bar Semi-Automatic Espresso Coffee Machines provides excellent value at its relatively affordable price point. For comparable extraction power and functionality from leading brands, buyers can expect to pay almost twice as much. The KOIOS EM621 20 Bar Semi-Automatic Espresso Coffee Machines punches far above its weight class.


In conclusion, the KOIOS EM621 Espresso Machine stands out as a versatile, efficient, and user-friendly option for anyone looking to enjoy barista-quality espresso at home. Its combination of advanced features, ease of use, and stylish design makes it a valuable addition to any kitchen. Whether you’re a seasoned coffee aficionado or just beginning to explore the world of espresso, the KOIOS EM621 offers the functionality and quality to enhance your coffee experience.


  • 1200W power
  • 120V 60Hz for North American electrical
  • 11.6 x 11.6 x 6.3 inch dimensions
  • 8.71 lb weight

Box Contains:

  • Main espresso machine unit
  • Portafilter
  • Single shot filter basket
  • Double shot filter basket
  • Plastic tamper
  • Measuring scoop
  • Steam wand
  • Water reservoir
  • Instruction manual

How to Use:

  1. Fill water tank and insert into machine
  2. Turn on power switch and allow machine to heat up
  3. Grind espresso beans to fine consistency
  4. Pack ground coffee into portafilter basket and tamp down
  5. Lock portafilter into group head and place cup below
  6. Press button for single or double shot
  7. Steam milk with wand after purging water initially
  8. Enjoy espresso drinks!

Frequently Asked Questions about the KOIOS EM621 Espresso Machine

Is the KOIOS EM621 a good espresso machine?

The KOIOS EM621 is a well-rated espresso machine that offers a variety of features and functions at a competitive price. It is a good choice for home users who want to make café-quality espresso drinks without spending a lot of money.

What are the pros and cons of the KOIOS EM621?


  • 20 bar pump for consistent espresso extraction
  • PID temperature control for precise brewing
  • Three extraction modes for different coffee drinks
  • Powerful steam wand for frothing milk
  • Large water tank for multiple brews
  • Compact and easy to use


  • Some users have reported that the machine can be noisy
  • The steam wand can be difficult to control
  • The machine is not as durable as some other models

How do you use the KOIOS EM621?

To use the KOIOS EM621, follow these steps:

  1. Fill the water tank with fresh, cold water.
  2. Grind your coffee beans to a fine grind.
  3. Add the ground coffee to the portafilter and tamp it down.
  4. Place the portafilter into the machine and lock it in place.
  5. Select your desired extraction mode.
  6. Press the button to start brewing.
  7. Once the espresso has brewed, remove the cup and enjoy.

How do you clean the KOIOS EM621?

To clean the KOIOS EM621, follow these steps:

  1. Unplug the machine and allow it to cool down.
  2. Remove the water tank and empty it.
  3. Wipe down the exterior of the machine with a damp cloth.
  4. Remove the portafilter and clean it with warm, soapy water.
  5. Rinse the portafilter and dry it with a clean cloth.
  6. Fill the water tank with fresh, cold water and replace it on the machine.
  7. Plug the machine back in and turn it on.
  8. Place an empty cup under the steam wand and turn on the steam.
  9. Allow the steam to run for a few minutes to clean the steam wand.
  10. Turn off the steam and wipe down the steam wand with a damp cloth.

What are some tips for using the KOIOS EM621?

Here are some tips for using the KOIOS EM621:

  • Use fresh, cold water for the best results.
  • Grind your coffee beans to a fine grind.
  • Tamp the ground coffee down firmly in the portafilter.
  • Experiment with different extraction modes to find your preferred taste.
  • Clean the machine regularly to keep it in good working condition.

Where can I buy the KOIOS EM621?

The KOIOS EM621 is available for purchase on Amazon and the KOIOS website.

What is the warranty on the KOIOS EM621?

The KOIOS EM621 comes with a one-year warranty.


  • Use filtered water to improve the taste of your espresso.
  • Preheat your cup before brewing to keep your espresso warm.
  • Experiment with different types of coffee beans to find your favorite flavor.
  • Add a splash of milk or cream to your espresso for a richer flavor.
  • Make a latte or cappuccino by frothing milk and adding it to your espresso.
  • Use the steam wand to heat up water for tea or hot chocolate.
  • Clean the machine regularly to keep it in good working condition.