Breville BES840XL The Infuser ► A Steady Low Pressure Pre-infusion Gently Expands the Grinds for an Even Extraction Balanced flavors are drawn evenly from all the grinds. So what is the best way to prepare the grinds for an even extraction? Rather than start with bursts of high pressure, a steady low pressure pre-infusion gently expands the grinds before stepping up to high pressure for an even extraction.
PID temperature control delivers increased temperature stability for a better tasting coffee and high power 1700W for high pressure steam and faster heat up Low pressure pre-infusion Electronic PID temperature control 1700W high power 1 & 2 cup volumetric control Programmable shot Integrated on-board tamper Dedicated hot water 54mm stainless steel porta-filter 15 bar Italian pump. Low pressure pre-infusion gently delivers water pressure at between 2 to 4 bar to allow the coffee grinds to expand prior to extraction at the optimal full pressure of 9 bar. This enhances the release of the oils to produce a balanced espresso. This pressure and its duration is user programmable.
The programmable pour, or semi-automatic function, simply controls the volume of the espresso pour, at the press of a button. That's 30ml for a single shot and 60ml for a double. Which, of course, is adjustable. With both a Thermo block and a Thermo coil, cold water passes through a pathway within what is essentially a block of heated metal. This heating method is designed to offer a consistent temperature that is required to achieve a consistent and optimal espresso temperature. Specifically a Thermo coil houses a Stainless Steel tube (or coil) within the metal mass.
Extraction of coffee with water over 92-94°C will result in a bitter or burnt taste. Only required with Thermo block or Thermo coil machines, the Auto Purge feature flushes the over heated water required for steaming back to the optimal espresso extraction temperature.
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