DavecUK I believe (could be wrong) they use 2 vibe pumps, one for the brew thermoblock and one for the steam one
My understanding Dave is they use two vibe pumps in order to dynamically mix hot and cold water to the specific temperature required for the profile. This allows accurate temperature profiling as the vibe pumps can pump very small increments of water if needed, and allows it to compensate for cooler coffee/ambient temp etc. They have a separate heater for brew and steam functions.
Decent DE1 • Mazzer Philos