A dynamic preheater assembly ensures that water entering the coffee boiler is precisely 170 degrees F. 170 degree F water replaces hot water exiting the group, reducing temperature swings in the coffee boiler.

An algorithm-based PID temperature controller further reduces the temperature fluctuation in the coffee boiler.

The group cap, which was designed by Piero Bambi, and an integrated ruby flow restrictor reduces channelling to ensure that water never leaves the saturated area of the coffee boiler, hence eliminating the introduction of temperature instability during brewing.