Instead of pouring water to within 1/4" to the top of the sight glass, I pour right up to where the water level meets the sight glass housing. I allow the machine to reach its proper temperature/pressure which is just below 1 BAR and allow it to settle a bit, usually 1-2 minutes. I fill my espresso cup half-way with cold water and then pre-heat the cup via the steam wand - doing two things at once in the process - bleeding off air pressure (false pressure) and secondly, stabilizing the boiler's pressure again. I then place the an empty portafilter onto the group head and lift the lever allowing about 2 oz of water to flow through. Stick your finger in this water, its probably only 115F and contains residual grounds from the last shot. Dump that water out. Load the coffee now into the portafilter and pull the shot into the pre-warmed cup. Water level for the first real shot now is about 1/4" from the top. If I'm making a second cup, I usually pull the second shot within 90 seconds to avoid a high temperature over extraction shot.
There isn't any reference in the La Pavoni regarding short flushes. The factory recommends hot water to the portafilter to increase temperature, however, from my experience, that's doesn't do anything since it only heats up the coffee after extraction and nothing to do with higher water temperature saturating the coffee grind.
Current LaPavoni instructions on the importers' website are here: http://www.europeangift.com/warranty_dir.html Prewarming the portafilter with the group flush water will help a little bit with the first shot. Putting a cold portafilter into contact with a warmed group will pull heat out of the group. After the first couple of shots, precooling the portafilter under cold water will also help, as the group will now have too much heat....
Current LaPavoni instructions on the importers' website are here: http://www.europeangift.com/warranty_dir.html Prewarming the portafilter with the group flush water will help a little bit with the first shot. Putting a cold portafilter into contact with a warmed group will pull heat out of the group. After the first couple of shots, precooling the portafilter under cold water will also help, as the group will now have too much heat....
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