The older Gaggia Classic models used an aluminum boiler, which tended to wear out more quickly and sometimes resulted in aluminum particles breaking off and clogging the system. The E24 model's brass boiler is designed to be more durable and long-lasting, addressing these issues.
The transcript states that after turning on the machine, it takes approximately 3-4 minutes for the water in the boiler to reach 93-94°C (optimal brewing temperature). However, to properly heat the group head for use with a portafilter, it takes roughly 7-8 minutes unless you run some water through the group head to speed up the process.
The aluminum boiler in previous Gaggia Classic models was prone to faster deterioration and sometimes created small particles that could clog the machine. The brass boiler in the E24 is a more durable material, designed to be longer-lasting and to eliminate the problem of aluminum particles contaminating the system.
The transcript does not provide a direct comparison of the Gaggia Classic Pro E24 to other machines Davide Costanza has tested. While he mentions dual-boiler machines in the context of the E24's single-boiler system and its impact on milk frothing, no other specific models are referenced for comparison.
This video reviews the Gaggia Classic Pro E24 espresso machine. Davide Costanza highlights the machine's new brass boiler, improved durability, and ease of use, while also discussing the single-boiler system and its implications for milk frothing.