I own the Gaggia Classic, and as far as I know it uses aluminum or stainless steel (depending on the year) for the boiler. It's a semi-automatic machine, and pe

I own the Gaggia Classic, and as far as I know it uses aluminum or stainless steel (depending on the year) for the boiler. It's a semi-automatic machine, and personally I love it. Barista grade portafilter, makes a very good espresso. I replaced the steam wand with the Rancilio Silvia wand for better steam action; it's a simple five minute job and worth doing if you go with this machine.