Overview
The La Marzocco KB90 is a commercial espresso machine that has found its way into the homes of the most dedicated and well-heeled espresso enthusiasts. Originally designed for high-volume specialty coffee shops, the KB90 introduced the revolutionary Straight-In portafilter system — an ergonomic innovation that allows baristas to insert the portafilter straight into the group head rather than twisting it in. This dramatically reduces repetitive strain during busy service. The dual boiler system with saturated group heads ensures unwavering thermal stability across all groups. The ABR (Auto Brew Ratio) system uses a scale integrated into the drip tray to measure output weight in real time, automatically stopping the shot at the programmed ratio. The KB90 features independent PID control for each group, a massive steam system, and the build quality that has made La Marzocco the most trusted name in specialty coffee. For home use, this machine is extreme overkill — but for those who want the absolute best commercial technology available, regardless of price, the KB90 delivers an unmatched experience.
The La Marzocco KB90 comes equipped with PID temperature control for precise brewing, pre-infusion for even extraction. It features a dual boiler boiler system made of stainless steel with a 350 ml capacity. The rotary pump delivers 9.0 bars of pressure for optimal extraction.
Priced at $18,000, the La Marzocco KB90 is designed for passionate enthusiasts and semi-commercial users who accept nothing but the best. The dual boiler design allows simultaneous brewing and steaming, making it ideal for milk-based drinks without any wait time.
In terms of build quality, the La Marzocco KB90 is a substantial machine, weighing in at 55.0 kg, manufactured in Italy, drawing 4500W of power. With dimensions of 500 x 600 x 450 mm (W×D×H), make sure you have adequate counter space. This machine requires direct plumbing, which provides unlimited water supply but needs professional installation.
Pros & Cons
Pros
- PID temperature control ensures consistent extraction temperature shot after shot
- Pre-infusion gently saturates the coffee puck before full pressure, improving extraction evenness
- Dual boiler design allows simultaneous brewing and steaming with no temperature compromise
- Stainless steel boiler is corrosion-resistant and easy to maintain
- Standard 58mm portafilter is compatible with a wide range of third-party baskets and accessories
- Built-in cup warmer keeps your cups at optimal temperature
Cons
- Heavy at 55.0 kg — difficult to move once placed, requires sturdy counter space
- Premium price point at $18,000 represents a significant investment
- Requires direct plumbing — professional installation needed, not easily relocated
Full Specifications
| Brand | La Marzocco |
|---|---|
| Model | La Marzocco KB90 |
| Category | Dual Boiler |
| Status | Current |
| Country of Origin | Italy |
| Year Introduced | 2018 |
| Boiler Type | Dual Boiler |
| Boiler Material | Stainless Steel |
| Boiler Capacity | 350 ml |
| Steam Boiler Capacity | 3500 ml |
| Pump Type | Rotary |
| Pump Pressure | 9.0 bar |
| PID Control | Yes |
| Pre-Infusion | Yes |
| Pressure Profiling | No |
| Flow Control | No |
| Group Head | Saturated |
| Portafilter Diameter | 58 mm |
| Steam Wand | Commercial |
| Water Source | Plumbed |
| Cup Warmer | Yes |
| Dimensions (W x D x H) | 500 x 600 x 450 mm |
| Weight | 55.0 kg (121.3 lbs) |
| Wattage | 4500 W |
| Voltage | 220V |
| MSRP | $18,000 |
Our Verdict
The La Marzocco KB90 sits in the dual boiler category, which is the gold standard for home espresso machines that can brew and steam simultaneously. This is a prosumer-grade machine that borders on commercial capability. If you regularly make milk drinks and don't want to wait between brewing and steaming, this is the right architecture.
Frequently Asked Questions
Who is the La Marzocco KB90 designed for?
The La Marzocco KB90 at $18,000 is a prosumer-grade machine designed for experienced home baristas who want near-commercial quality. It's not ideal as a first machine, but it's an excellent upgrade for those ready to invest in their espresso passion.
Can the La Marzocco KB90 brew and steam at the same time?
Yes. The La Marzocco KB90's dual boiler design allows you to brew espresso and steam milk simultaneously. This is ideal for making milk-based drinks efficiently without any temperature compromise.
How often does the La Marzocco KB90 need maintenance?
Regular maintenance includes daily backflushing (for machines with solenoid valves), weekly cleaning of the group head and portafilter, and descaling every 1-3 months depending on water hardness. Using filtered water significantly reduces scale buildup and extends machine life.
What grinder should I use with the La Marzocco KB90?
A prosumer machine like this deserves a premium grinder. Consider the Niche Zero ($600), Eureka Mignon XL ($700), DF64 variants, or premium options like the Weber EG-1 or Lagom P64. The grinder should match or exceed the machine's capability for best results.
Is the La Marzocco KB90 worth $18,000?
The La Marzocco KB90's value depends on your commitment to espresso. If you drink espresso daily, a quality machine pays for itself vs. cafe purchases within 6-12 months. The La Marzocco KB90 offers PID temperature control, dual boiler convenience at its price point, making it a sound investment for regular espresso drinkers.
Recommended Grinder Pairings for the La Marzocco KB90
A good grinder is essential for getting the most out of your espresso machine. Here are some grinders that pair well at this price level: