The difference between Celani's 21 W and Rossi's 16 kW is unimportant,
in my opinion. They are equally close to commercialization. The 16 kW
looks more impressive to people who do not understand the technical
issues. The megawatt reactor looks impressive to such people as well.
To me, it looks like a gigantic white elephant. It is a distraction,
and an absurd waste of time and effort. A dangerous piece of junk. No
one in his right mind would buy it. I might buy one of those boxes
inside it, but I would no more crank up the whole thing than I would
try to fly the Caproni Ca-60 Transaereo 'Capronismo' -- a similar
product of grandiose Italian engineering. Do a Google image search for
"Caproni Ca-60 Transaereo" and you will see what I mean.
Where you say: "equally close to commercialization", this of course is
not true. The 1 MW reactor is for sale now and has industrial certification.
(unless -- the usual caveat -- it is all a lie. In that case they are
not equally close to commercialization, but that is not what you meant).
The comparision with the Caproni Ca-60 Transaereo is unfair. That was an
early attempt to scale up a working product. The attempt failed. Other
attempts succeeded. Rossi's attempt to scale up did not fail, too. It is
a pretty sound, safe and useful idea to scale up energy devices by
running my of them in parallel. This idea helped him to (1) lend more
credibility to his invention; (2) come up with a useful product for the
market which can be tapped soonest, because of lighter certification
requirements.
Andre