With that volume of steam boiler use, I think you'd get a lot of value out from the efficiency of joysticks. Also, the M58 comes with both two and four hole tips, so you'd be able to dial in the exact boiler pressure and tip combination to get the amount of steam control you want. But keep in mind, if you have the steam boiler cranked up for max pressure, the hot water does come out about 50-60 degrees hotter than you want for tea brewing (so you'd want to let it cool for a minute). I don't know of a home machine that has a mixing valve, but I make tea for friends this way regularly because of convenience
Hiya Tom, thanks for posting those pics.
I've owned machines with both pump layouts, and particularly remember two different La Spaziale Vivaldis that experienced motor bearing failure due to the possibility of water leaking directly into the motor and pooling up at the bearing (if they shared the M58 layout, the motor would have been safe). I believe the Duetto 3 has the motor placed under the pump, which is even more risky for motor damage. The M58 and Vetrano 2B do have rubber pump mounts (you can see at the top of the pump mounting bracket), and they share the whisper silent performance.
The other comparison thread I posted with the brief comparison between the M58 and 700 Pro drew some helpful info when user Malling described some slight differences between these two machines. He said, "...we also have to remember, that there simply is allot more wires in a V2B and M58 then in the above mentioned machines, the reason for this is, that QM are using magnetic valves, and if you take a closer look at the water tank holder, there is no less then 5 wires attached to it, there are 8 wires attached to the two main switches at the front etc. all of this adds allot of wires, if Izzo and Profitec have followed the same path, they too would have looked allot more like a birds nest...if we just look away from the wiring for a moment, then the internal layout is actually good, RPM motor is placed where it should be, in such a small frame, the PID is placed at the coldest place on the front panel, and not directly above a steam boiler (like Duetto), there are allot of holes beneath the boilers, the frame is entirely made of Stainless steel and not just painted steel. All electronic is placed at the coldest possible location with good heat sink capabilities, meaning prolonged lifespan...with Profitec if you get too high a pressure then the safety valves will spray its entire content on the internals, QM however will lead it directly to the driptray."
Also, for what it's worth I'm probably one of the only people who has had to interact with the whole wiring harness when I installed my 2B's control box and solid state relay (bought a project machine that was missing a few things), and the combination of user manual and technical support helped me get the seven terminals in their correct places very quickly (the number of terminals is small despite how complicated the harness looks). That experience helped me feel very confident with the quality of the internals, and that maintaining these two flagship machines will be very similar over the next 5-10 years.