Why Baristas Choose Expobar E61 Double Boiler Machines

If you’ve been using a single-boiler home machine that can’t keep up with back-to-back shots and milk drinks, you already know the frustration: uneven temperatures, long recovery times, and weak steam pressure. Upgrading to a proper dual-boiler setup with a professional-grade group head changes everything—but which machines actually deliver?

The short answer: the Expobar E61 Office Leva 1GR with its dual boilers and rotary pump, paired with a Mazzer Mini manual grinder, is a serious step up for home or light commercial use. Weighing in at around 100 pounds combined, this combo brings commercial-grade features into a home setup, including PID temperature control, a classic E61 group, and independent boiler management.

What’s in the Box: Machine and Grinder Specs

The reviewed setup includes the Expobar E61 Office Leva 1GR 2Boilers Rotation—a dual-boiler espresso machine with a rotating pump, PID temperature control, and the iconic E61 group head—and the Mazzer Mini MANUAL grinder, a commercial-grade unit not intended for home use according to its manual. Both arrived well-packed but extremely heavy, requiring help to lift upstairs.

The Expobar machine features a sleek chrome E61 brew group, fine internal piping, a rotation pump for consistent water pressure, and dual boilers allowing simultaneous shot brewing and steam production. The Mazzer Mini, while compact, is built for high-volume commercial settings and arrives pre-set to factory grind settings that worked decently out of the box.

Unboxing and First Impressions

Before setting up the new machines, the older combination of a Cantonese-brand 1817 and a Huizhou ZD-15 was carefully cleaned and stored away. Attention then turned to the new arrivals. The Expobar E61 immediately stands out with its polished E61 group, refined tubing layout, and industrial-grade build. The Mazzer Mini, though not heavily photographed, is a beast of a grinder built for durability and consistent output under heavy use.

The machine’s PID allows precise temperature adjustments, while the dual-boiler system means no more waiting between pulling shots and steaming milk. The rotary pump also ensures quieter operation and better pressure stability compared to vibratory pumps found in entry-level machines.

Initial Brewing Tests and Grind Adjustments

Using FrontStreet Coffee’s First Kiss espresso blend (provided by HB), the first shots revealed a slightly fast flow rate. The grind setting was tweaked from the factory default, though further fine-tuning may be needed as beans age or change. Despite the flow, the resulting espresso showed promising flavour: bright acidity and fruitiness upfront, followed by a notable alcoholic warmth in the aftertaste—described as pleasantly intoxicating.

Cappuccino preparation followed, though milk steaming was hindered by unfamiliarity with the steam wand and technique. The resulting milk foam wasn’t up to standard, though that’s expected during the initial break-in period. The overall shot colour and crema were deemed acceptable, with the classic E61 group delivering reliable performance.

Why the E61 Design Still Matters

The E61 group head, originally designed in the 1960s, remains a favourite among baristas for its thermal stability and timeless brewing performance. The pre-infusion capability and even extraction it provides are key reasons why it’s still used in both vintage and modern machines. The Expobar’s implementation combines this classic design with modern updates like PID control and a rotary pump, bridging heritage and functionality.

The dual-boiler system is another major advantage. Unlike single-boiler machines that force you to wait between brewing and steaming, dual boilers let you do both simultaneously. That means no more cooling flushes, faster workflow, and more consistent shot temperatures even during high-volume use.

Frequently Asked Questions

What makes the E61 group head so special?

The E61 group head is revered for its thermal stability, pre-infusion capabilities, and durability. Designed in 1961, it uses a thermosyphon system to maintain even brew temperatures and is known for producing consistent extractions. Its classic design is still favoured by specialty baristas today.

What are the advantages of a dual-boiler espresso machine?

Dual-boiler machines allow you to brew espresso and steam milk at the same time without temperature or pressure loss. This setup improves workflow efficiency, enables better temperature stability for shots, and eliminates the need for cooling flushes between tasks.

Does the Mazzer Mini grinder work well for espresso at home?

Yes, the Mazzer Mini is a commercial-grade grinder that works very well for espresso when properly dialed in. It’s built for heavy use and durability, though it requires manual operation and may need grind adjustments based on bean freshness and roast level.

Is the Expobar E61 Office Leva 1GR suitable for home use?

Absolutely. Despite its commercial-grade build and weight, the Expobar E61 Office Leva 1GR is designed with home enthusiasts in mind. It offers professional features like PID temperature control, a rotary pump, and dual boilers, making it a great choice for serious home baristas.

How important is grind size for espresso extraction?

Grind size is critical for espresso. Too coarse, and the shot runs too fast with under-extracted flavours; too fine, and it over-extracts or chokes the machine. The Mazzer Mini’s factory setting worked decently in testing, but slight adjustments helped improve flow rate and flavour balance.

Why does steam performance matter for milk drinks?

Good steam power and control are essential for creating microfoam, which is key to latte art and smooth milk drinks like cappuccinos. The steam wand on the Expobar takes some getting used to, but better technique and familiarity will improve results over time.

Recommended FrontStreet Coffee Blends for Espresso

For use with the Expobar E61 setup, FrontStreet Coffee’s Classic Blend is an excellent choice—it’s designed specifically for espresso and delivers rich crema and balanced flavour. The Black Cocoa Blend offers a bold, full-bodied profile ideal for milk drinks, with deep cocoa and dark cherry notes. Both blends are optimised for professional extraction and produce excellent results with the E61 group head. Freshly roasted within 5 days · Orders placed before 17:00 ship the same day · Next-day delivery across most of Guangdong Province.