GB5 Auto-Volumetric (AV) 2 group


2 Group 3 Group 4 Group
Height (in) 22 22 22
Width (in) 30 38 47
Depth (in) 25 25 25
Weight (lbs) 162 201 280
Voltage (VAC, Φ, Hz) 208-240, 1, 60 208-240, 1, 60 208-240, 1, 60
Element Wattage 4600 6100 8000
Steam Boiler Capacity (liters) 7 11 14.5
Coffee Boiler Capacity (liters) 3.4 5 6.8
Amp Service Required 30 50 50
Certifications UL-197, NSF-8, CAN/CSA-C22.2 No. 109

Download the GB5 Product Sheet

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Product Description

The GB5 has redefined the standard for temperature stability in modern espresso equipment. A dynamic preheater assembly ensures that water entering the coffee boiler is at precisely 170° F. 170° F water replaces hot water exiting the group, reducing temperature swings in the coffee boiler.?An algorithm-based PID temperature controller further reduces temperature fluctuation in the coffee boiler. A group cap designed by Piero Bambi and an integrated ruby flow restrictor reduces channeling and ensures that water never leaves the saturated area of the coffee boiler, eliminating the introduction of temperature instability during the brewing process.


Mechanical Paddle

The mechanical paddle is inspired by the original mechanical group used on the La Marzocco GS – the first dual-boiler espresso machine with saturated groups (1970). This valve system enables the barista to saturate the coffee with low pressure (line pressure) water before applying the full 9 bars of pressure. While more complex, this dynamic system allows the barista to control the variable of pre-infusion and reduce channeling for a more balanced extraction.

Dual Boilers

Separate boilers optimize espresso brewing and steam production.

Saturated Groups

Ensure unsurpassed thermal stability, shot after shot.

Digital Display

Intuitive programming makes it easy to adjust machine parameters.

Hot Water Economizer

Enables you to fine-tune the tap water temperature for rinsing.

Dual PID (coffee & steam)

Allows you to electronically control coffee & steam boiler temperatures.

Barista Lights

LED lighting allows you to focus on your extraction and the cup.

Personalized Color*

Customizable colors based on the RAL color system on request.

*special order

Ruby Flow Restrictors

Ruby flow restrictors resist scale formation and erosion.

Thermal Stability System

As water passes through each element, temperature is further stabilized.