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Saturated group
A brew group that is directly attached to (and shares water with) the brew boiler, keeping the group head at a stable, precise temperature at all times.
Category: Espresso Machine — Groups & Brew Path
A group head design where the group body is connected directly to the brew boiler — essentially, the group is part of the boiler. La Marzocco invented the saturated group; Synesso, Slayer, Kees van der Westen, and many others now use the design.
Why it matters — Saturated groups deliver exceptionally stable temperatures because the group and the brew water are always at the same temperature. No thermosiphon, no cooling flush, no warm-up wait. This is why most commercial specialty café machines use saturated groups.
Good to know
- Saturated groups warm up faster than E61 groups (15 minutes vs 25–30 minutes) and hold temperature more accurately.
- Trade-offs are weight, size, and price — saturated groups are heavier and more complex to manufacture.