A page in progress:
The La Rocca Expres is a 2-group, rotary pump commercial espresso machine.
This is the espresso machine I'm currently using at home. It is in good condition considering it hadn't been used for a year when I bought it.
It has had the steam, water & anti-vacuum valves re-built, the main switch replaced, all knobs replaced, one element disconnected (earth leakage test on one element was marginal & not being in a commercial environment, doesn't need super fast recovery). The boiler has been insulated to reduce heat loss, hence power consumption, which means that the cup-warmer is only slightly warm - No problem, I pre-heat the cups with water from the tap anyway.
For insulation, I wrapped the boiler in 2-layers of silicone, non-skid mat (the stuff used to protect tables from hot plates, purchased from 'Spotlight' fabric shop), followed by 2-layers of an insulation fabric (same shop - used to make oven mitts & ironing board covers).
Makes great espresso, latte, cappuccino etc - Overkill, perhaps, for the 15+ drinks I make each day with it (includes using it as a source of hot water for cocoa, tea, instant coffee etc) - But then...
I run it on filtered water - Carbon filter, cation exchange resin filter ('softens' the water by removing calcium & magnesium) & a simple 10-micrometre (micron) poly-spun filter. Pressure is 3.5 Bar. All of this restricts water flow, so I included an accumulator (as used in a reverse osmosis system - 5-litre), to smooth out water flow.
Many of the parts on this machine are generic & can be found/substituted with those from other common brands of espresso machine. I will put a table of compatible parts on here sometime soon.