Small water chamber. Very finicky and sensitive to exactly right everything. Very expensive (Over $400 more than 20 years ago.)
This was my first espresso machine, probably purchased in 1978, and used continuously for 10 or 12 twelve years after that. Finally retired because it‘s just too hard to master. Can‘t really deliver a good crema, although it‘s excellent for the foam part of the capuccino job. You are much better off with a pump machine. Of course, I‘ve gone through four of them since, and am still on the hunt. I guess I‘ve concluded you have to buy a commercial machine and use Illy coffee to have the same experience at home that you can have either (1) in the Victor Emmanuel Galleria in Milan or (2) at any stop along the autostrada. I keep trying. So far Baby Gaggia is the best I‘ve had, but see review. I‘m on the prowl again.