Low Pressure Pre-infusion 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. Thermoblock/Thermocoil With both a Thermoblock and a Thermocoil 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 Thermocoil houses a Stainless Steel tube (or coil) within the metal mass. Purge Function Extraction of coffee with water over 92-94°C will result in a bitter or burnt taste. Only required with Thermoblock or Thermocoil machines the Auto Purge feature flushes the over heated water required for steaming back to the optimal espresso extraction temperature. Pulse Pre-Infusion The 15 bar pump initially pulses to expand the grinds prior to extraction. Providing a more balanced espresso shot.