La Marzocco GS3 AV

The GS3 is La Marzocco's countertop take on its bar-machine architecture: two separate boilers, one for coffee and one for steam, feeding an exposed saturated group instead of one tucked behind panels. The manual lists 41 x 53 x 35.5 cm (W x D x H) for the AV version and 33 kg, with the pump built into the chassis rather than sitting external to it as on many commercial installs.

On the AV, dosing is electronic: a keypad with four programmable buttons per group drives brewing and pre-infusion, each button carrying independent valve-open and valve-closed timing. A dual PID governs coffee and steam boiler temperatures separately, and a built-in 3.5-liter tank keeps the machine self-contained on water, with a fixed connection available as an option rather than a requirement.

The manual also documents a pump factory-set to 9 bar and two visible gauges, one per boiler. What the consulted documentation does not state is pump type (rotary or vibration), portafilter diameter, warm-up time, or boiler material — details worth chasing down before buying if they matter to you.