Earlier quoted context omitted.
Office microwaves (assuming it's not just a retail one that happens to be in an office) can be overpowered. Think the last one I was near was a 2.5kW unit.
Good lord, who uses that much power in a microwave? 600W are enough. (Clearly, the idiots microwaving fish in them. In one office I know they put a sticker with a crossed-through fish symbol after one particularly pungent incident)
Uhm. Have you seen https://www.miele.com/brand/de/revolutionary-excellence-3868... ? (scroll down a little bit, until the fish in ice block appeaers)
Just about 10kEUR :-)
I think that's the solid state microwave emitters arranged in a phased array finally making their entry into the mass market.