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Having a dual boiler machine is nice but for one or two people using it at home you don't really need it, the second boiler is basically so you can use the steam wand without waiting for the pressure to build back up after pulling a shot or two.
Not sure if it's due to the single-boiler or a machine-specific issue, but the Gaggia Classic tends to have issues producing steam pressure alongside pulling a regular shot right? It's been over a decade since I owned one but I recall that being a common complaint about them.
mmccarthy
Sumo
The rorary pump has more consistent and higher pressure, also you can plumb it in.
https://www.wholelattelove.com/blogs/comparisons/vibration-vs-rotary-shots
Having a dual boiler machine is nice but for one or two people using it at home you don't really need it, the second boiler is basically so you can use the steam wand without waiting for the pressure to build back up after pulling a shot or two.