Review: Quick Mill Arnos Espresso Machine The Quick Mill Arnos is a standout semi-automatic espresso machine with all the features you want in a high-end brewing equipment. HX boiler, PID control, a vibration pump, and a sharp appearance bring the Arnos to the top of our recommended list. The Quick Mill Arnos features a 1.8 liter stainless steel boiler coupled with an LED PID temperature controller which doubles as a shot timer. Along with the ever-iconic E61 brew group, you can expect rocksteady temperature stability shot to shot. Plus, with the heat exchanger boiler, you can brew and steam at [More]