There are many variables involved in espresso extraction, including grind size, dose, tamping, extraction yield, brew ratio, time (as a consequence) and water temperature, to name just a few.
High-quality espresso machines, like the Rancilio Silvia Pro X , usually have higher thermal inertia levels thanks to a design that considers how heat naturally disperses. By anticipating this in its design, the machine is both more efficient and sustainable.
To learn more about thermal stability in espresso machines, Carles González, the Coffee Competence Manager for Rancilio Group, in an interview with Perfectdailygrind.com talks and deepens this argument.
