E61 Group Head: The 1961 Design Still Running
Quick Answer The e61 group head is a heavy brass brewing assembly, introduced by Faema in 1961, that keeps espresso brew temperature steady using passive water circulation and gives you mechanical pre-infusion with a side lever. It is still built into machines from ECM, Rocket, Profitec, Lelit, Quick Mill, and Bezzera because the design works…