Prosumer and Gourmet espresso machines are the upper class following the class of kitchen espresso machines. They comprise technology close to commercial espresso machines (e.g. brewing group, pump, valves, etc.), they do have a boiler capacity between kitchen machines and commercial machines to balance out the pre-heating time against the steam volume (as bigger the boiler as better the steam and as more long the pre-heating time).
Quality counts and we only carry brands and machines of brands which we tested at our facility for a while: Bezzera, established 1905 in Milan, Italy; Elektra, established 1947, the machines ar mostly hand made in Northern Italy, Nuova Simonelli, established 1936 in Central Italy; Vibiemme, a younger company, established 1976 out of the left over of the then bankrupt Faema in 1975 and the youngster ECM, established 1996 in Germany, but the ECM machines we sell are made in Milan, Italy and mostly identical to the corresponding Bezzera Machine.