9 barWith coffee machines its all about the water pressure. The higher the pressure the finer the coffee grinds you can use. I think professional machines work at 20 bar. I have a delonghi and they work at 10 bar i think. Still makes a good cup but if i turn the grinder to too fine then it struggles to pump water through. Had it for 8 years now tho maybe more and only had to swap one part.
Pretty much all the older delonghi machines are the same internally so the more expensive machines only add milk frother, and digital display, touch buttons. The defuser is the same across the models aswell.
For a decent one you are look 500ish
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