First, let’s examine the anatomy of the E61. The lever has a cam with a specially designed shape incorporating a mechanical three-way valve. There is a brew valve at the top, a pre-inf… 展开

Advantage One – Great Temperature Stability
The E61 group head and a standard brewing head differ insofar as two water pipes connect th… 展开

Drawback One – Preheating Takes Time
As we explained earlier, the preheating is achieved by circulating hot water between the brew head and boiler. While this has advantages, it ta… 展开

In the 1960s, when automatic control technology was still expensive, the E61 group head offered a viable solution. However, nowadays, when microelectronics … 展开