Thank you for your comments and suggestions and excuse when trespassing site policies -- maybe you might add the above p.s.-post to the FAQ file to make the point clearer.
Wookie, unfortunately you didn't leave the exact link. Following the link brings me to a page that doesn't seem to offer much. But i guess my machine has a vibration pump and not a rotary pump -- it is not the plumbed version but the tank version Epoca S1 /w tank. It is supposed to have independent heat exchangers though i am not sure what is meant by independent.
But here's a pic of the pump (sorry, i couldn't get a clear pic of the label on it -- it says: Ulka Italy, Model E Type EP5 120V 60Hz 1/1min. CI.A 41W)
Here are a few more pics. First the backside:
No idea, if my comments are helpful to the experts. On the right side you can the the Boiler Fill Solenoid (i guess), next to the left is the 3-way-connection i spoke of earlier, the third branch lies behind and leads to the drip tray. The brass loop right in front of the boiler connects to the pressure gauge in the front that measures the boiler pressure which will be adjusted by screw located in the black box.
The left side (left seen from the front):
That would be the 3-way-connection and the Boiler Fill Solenoid....
The right side:
This side is mostly electrics. The brass pipe in the background connects the adjusting box for the boiler pressure with the boiler.
The front side (for completeness):
The brass pipe on the right connects the 3-way-connection to the drip tray.
One more pic from above (front is left):
The screw located above and on the brewhead, which i mentioned before with a detail pic, can be seen on the left side between red electric cable and black insulated water tube. I have no idea what the function of this screw might be -- it looks almost like it might be possible to block the flow to the brew head or it might be related to the 3-way-solenoid valve under it.
The brass pipes in this picture are:
a.) in 12 o'clock direction: Boiler Fill Solenoid;
b.) 10 o'clock direction: hot water outlet;
c.) 2 o'clock direction: brew water, connects to the previous mentioned 3-way-connection;
d.) 3 o'clock direction: boiler pressure gauge;
e.) 4 o'clock direction: boiler pressure adjustment (black box);
f.) 7 o'clock direction: steam wand
Hmm.... did forget something? Hmm, yes, on the last pic there's a rather bright, big nut to see on the right side. This thing is directly on the boiler and looks like some safety valve but doesn't look like it could be twisted in either way. It also lacks the shape for attaching any tool.
Hm, thanks again and sorry to bother you.