timoh wrote:Is an accumulator tank needed when using Flojet?

Without an accumulator, the Flojet will cycle on ("brr-r-r--r-r-rt") within a few seconds after the espresso machine's pump engages and flutter on for an instant every few seconds during the extraction ("br-r-rt"... "br-r-rt"... "br-r-rt"). The Flojet has no trouble keeping up with the tiny water debit your machine requires, but it will run less frequently and the inlet pressure will be more even with an accumulator. So while technically a Flojet doesn't need an accumulator in this application, in practice I find it a worthwhile investment.

Jon's espresso machine uses a Flojet without an accumulator in this video. You can hear it cycling through most of the extraction: