Multi-boiler machines allow the brewing water temperature to be set independently from the steam boiler. This allows more precise control of the brewing temperature and makes it much easier to change the temperature. The temperature can usually be changed in the machine’s programming menu.
Illustration: Multi boiler system, 1: heat-exchange boiler, 2: PID controlled brew boiler, 3: PID controlled heated group.
In many multi-boiler machines, however, the brewing temperature is measured inside the boiler,