jcoleman08 wrote:I am left wondering how the temperature stability issue would rear its head in a single boiler with an aluminum tank (e.g. the Gaggia Classic) vs a single-boiler with a brass tank (e.g. the Silvia), and how a PID would level this difference.
If you're thinking PID-- and many Silvia/Gaggia owners invariably do --then I recommend thinking long and hard about the next step up. When you factor in the cost of a PID for a single boiler, you're within striking distance of an entry level HX espresso machine. As you noted, it's not just about simultaneous steaming/brewing; generally speaking, the next tier is also more consistent and more forgiving of errors in barista technique.
For what it's worth, had someone offered me this advice at the start of my espresso journey, I would have patiently listened and then gone for the lower-cost option, believing fully that they were overstating their case. My original advice stands: If you can afford it and think you'll be in the game two years from now, skip the single boiler.
As a side-note, I wrote the
Rancilio Silvia Flash Review eight years ago. Here's an excerpt from the conclusion:
HB wrote:If you see yourself preparing lots of cappuccinos or lattes, you may want to consider a heat exchanger (or dual-boiler) espresso machine. However, for a drink or two, a heat exchanger or dual boiler borders on overkill. Again, putting the temperature surfing issue aside for a moment, the most important consideration is whether you want to serve successive milk-based drinks.
If the answer is yes, then Silvia is not a good fit. If you are very focused, you can prepare milk-based drinks for four people in 20-25 minutes. I found it became more chore than pleasure, so I limited group service to three people (myself included). After upgrading to a heat exchanger espresso machine, I never wait for it, independent of group size. To be clear, I can recommend Silvia if you're willing to work a little harder and don't mind the inherent delays. If you decide later to upgrade, its resale is very good.
My opinion has changed over the years, not only because I've been exposed to a wider range of equipment, but because the mid-tier has moved downward in price while the entry-level tier has remained the same or gone up, depending on model and whether you consider a PID a "must have".