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Ah yes, which would be mostly relevant for cups in relatively quick succession?
I'm asking because I'm half considering moving on my PID'ed Pavoni (~€300) and buying a second hand Vibiemme Domobar (~€450) which I can then PID again. I got sick of my caffeine dependence so I'm down to one cup per day, and my better half doesn't drink coffee at all. I guess I'd actually prefer a smaller boiler, to minimise the amount of energy used when heating it up every day.
Boiler size can vary