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The Pinnacle of Bespoke Engineering: Meet the Slim Jim
The Kees van der Westen Slim Jim Espresso Machine is the definitive choice for high-volume specialty coffee shops seeking a bespoke aesthetic without compromising on industrial-grade performance. Engineered with a sophisticated Multiple Boiler system, it features a dedicated large steam boiler alongside individual boilers for each group, ensuring total thermal independence. At its core, a high-capacity heat exchanger with a balanced cross-flow and electronically controlled cooling circuit provides a relentless supply of pre-heated water. Built for longevity and hygiene, the entire frame, boilers, and manifolds are constructed exclusively from high-grade 316L stainless steel, offering a level of build quality that is truly second to none.
Advanced Extraction Control and Ergonomic Excellence
Designed to elevate the barista's workflow, the Slim Jim introduces the intuitive "Bastone" levers, offering two programmable volumetric settings alongside full manual control for artisanal precision. Temperature stability is managed by a self-learning PID controller, while the innovative double spring pre-infusion cylinder ensures a progressive saturation of the puck for higher extraction yields. Unique features like the foot-activated steam valve and the non-stick PEEK "Cool Peek" dispersion plates keep the machine running efficiently during peak hours. With a large front-facing display for real-time shot timing and a dual-temperature hot water system, the Slim Jim blends avant-garde design with the most advanced extraction technology on the market today.
Kees van der Westen Slim Jim Pre Installation Manual
Kees van der Westen Slim Jim Installation Manual
Kees van der Westen Slim Jim User Manual
Kees van der Westen Slim Jim Parts List
You get all of these freebies when you purchase this machine through Prime Coffee Suppliers:
Multiple Boiler system: one large steam, one boiler per group to brew coffee. A heat exchanger with balanced cross-flow and an electronically controlled cooling circuit ensures well-conditioned supply of pre-heated water for the coffee boilers to ensure enormous capacity. Entire frame, boilers and manifolds are in stainless steel only.
Hot Water Temperature: The Slim Jim offers two different temperatures of hot water, one mixed and one boiling hot.
Bastone: Each group can be activated by one of the custom "Bastones", a small lever which offers two programmable volumetric settings and via a pushbutton a continuos flow. The lever also be programmes for full manual control.
Temperature Controller: The temperature in all the boilers is controlled by a PID; a self-learning device that keeps the temperature as stable as possible. Your machine can be delivered with the readout in either degrees Celsius or Fahrenheit.
Foot Activated Steam Valve: Shift efficiency and ergonomics up a gear, and put your foot down to steam. Our foot-pedal is safe, fast, leaves your hands free and feels like the most natural way to work. Once you try it you never want to go back.
Cool Peek Plate: The dispersion plate as well as the bottom of the piston is made in peek. This remains clean very long and does not absorb heat from brew water.
Pressure Gauge: Per group head indicating real-life extraction pressure development at the puck.
Drip Tray: Easily adjustable height.
Group Screen: Smooth, membrane type E61 group screen by IMS.
Choosing a new espresso machine is a massive step for any UK coffee business. It is the most significant investment you’ll make, and it dictates the quality of every cup that leaves your bar. Among the elite names in the industry, Kees van der Westen stands out for blending avant-garde Dutch design with obsessive technical precision.
The Slim Jim is a particularly clever choice. It offers a "bespoke" feel without the enterprise-level price tag of the Spirit, yet it outperforms almost everything in its class. Here is why this machine is a staple in high-end UK coffee shops.
1. A High-Definition Workspace
First impressions matter, and the Slim Jim greets the barista with a large, clear display positioned front and centre. This isn't just for show; it is the mission control of the machine. You can tune the settings exactly to your recipe requirements.
The interface offers an intuitive touchpad to manage a host of features, including a smart ECO mode to save energy during quiet afternoon periods. One of the most practical touches is the shot-timer. It automatically appears in full view the moment a group is activated, letting you monitor the extraction without losing focus on the pour.
2. Tactile Precision: The Bastone
Many baristas find that the "feel" of a machine changes how they work. The Slim Jim features the "Bastone"—a custom small lever for each group.
Programmable Volumetrics: Set two different shot volumes to keep things consistent during the morning rush.
Continuous Flow: Use the pushbutton for manual topping up or rinsing.
Total Control: You can program the lever for full manual operation, giving you the freedom to "play" with different roast profiles as you pull the shot.
3. The Science of Pre-Infusion
If you want to extract the full complexity of a light-roasted single origin, pre-infusion is vital. The Slim Jim uses a double spring pre-infusion cylinder, which ensures a slow, progressive soaking of the coffee bed.
By gently wetting and swelling the grounds before full pump pressure kicks in, you reduce "channelling" and keep fine particles from clogging the filter. This allows for a finer grind and a larger surface area, leading to a much higher yield of the oils and fats that carry those delicate aromas.
4. Thermal Stability and the Multi-Boiler System
In a busy environment, temperature drops are the enemy of consistency. The Slim Jim solves this with a sophisticated multiple boiler system and a massive 10.5-litre steam boiler.
Pre-Conditioned Water: Cold water enters via a large heat-exchanger inside the steam boiler, reaching the coffee boilers already at a stable temperature.
PID Control: Each coffee boiler is managed by a PID controller. This "intelligent" feedback system learns from past cycles to steer the heating elements with incredible accuracy.
Superior Materials: Built with 316L stainless steel, the boilers are designed to resist corrosion and handle the "aggressive" water often found in different UK regions.
5. The Zappo Steam Wand: Hygiene and Safety
Milk texturing is half the battle, and the Zappo steam wand makes it effortless. It features a double-walled stainless tube with a PEEK steam tip.
These wands are famous for being "non-burn," which is a huge safety win for the team. However, the real benefit is that milk hardly adheres to the surface. A quick wipe keeps the wand pristine, saving time and improving hygiene. For those looking for maximum speed, you can even opt for foot-activated steaming, leaving your hands free to prep the next pitcher.
6. Intelligent Safety and Maintenance
Reliability is built into the Slim Jim’s DNA. The machine uses solid-state relays and has no moving parts in the heating system, meaning there is less to go wrong.
From the outside, you can even perform a quick visual check via control lights at the bottom of the machine. These lights, combined with the display, tell you instantly if all heating elements are functioning as intended. If the water level ever drops too low, the machine shuts down safely to protect the elements, preventing costly repairs.
Is the Slim Jim right for you?
The Slim Jim fills the gap between a standard commercial machine and a full custom build. It’s a precision tool that lets you choose your own legs, panels, and aesthetics to match your brand.
1. CHOOSE YOUR CORE MACHINE
2. SELECT YOUR CONTROLS
3. BODY & PANEL UPGRADES
Body Panels (The Skin)
Front & PPIC Panels
4. FRAME & LEG UPGRADES
5. TRAY & RAIL DETAILS
6. PERFORMANCE EXTRAS
If you need a custom package built contact us on 0333 090 3477 / or contact us via the live chat on the right hand side of the page.
How to clean the Slim Jim: Ensure your machine stays in peak condition and every espresso tastes spot on by following our straightforward guide to daily back-flushing and steam wand maintenance.
How to adjust volumes on the Slim Jim: Master your workflow by learning how to programme the Bastone levers for precise, repeatable yields, ensuring total consistency for your customers throughout the busiest morning rush.
Proudly handmade in the Netherlands, Kees van der Westen creates exceptional espresso machines for connoisseurs who value both the craftsmanship and precision behind outstanding coffee.
No detail is overlooked in the design and engineering of these machines. Every component is crafted to inspire delight, aiming to bring joy to everyone in the espresso journey—from the knowledgeable distributor and passionate barista to the skilled technician and the customer eagerly awaiting their coffee.
