There is a pervasive notion that any new source of energy has to be available on a large scale from the beginning. People try to develop kilowatt or multi-kilowatt cold fusion fusion reactors. Brillouin Energy thinks they need this before they can begin marketing the product. Huang's sonofusion gadget is gigantic.
https://lenr-canr.org/acrobat/HuangBJwatercantr.pdf
Huang is an engineer, so he thinks big. Perhaps he makes kilowatt scale devices because they seem closer to practical scale machines. Look at the size of the equipment, as shown on p. 4, Fig. 4. Ed Storms thinks that trying to scale up is a mistake because people should first discover the mechanism and develop a model or theory. I agree with Ed! 100%! I, too, wish people would make 10 W gadgets rather than 5 kW ones. But perhaps there is some reason Huang's device does not work on a small scale. That is my impression from my visits to Hydrodynamics and discussions with Huang. The gadget does not need to be as large as Tokamak, fortunately.
I also disagree with the "scale up" idea because there is a vast market for low level energy production, of ~1 W or even microwatts, for things like cell phones, wristwatches, hearing aids, digital gadgets, and pacemakers. The value of 1 W delivered to a hearing aid is far higher than 1 W delivered to your oven toaster with AC wires. A Duracell 675 hearing aid battery costs $1.41 and delivers a total of 845 mWh:
Duracell Hearing Aid Battery Specifications
That is $1,665 per kilowatt-hour, compared to $0.16 per kilowatt-hour for mains electricity (10,400 times more expensive). It is best to begin an industry with a device aimed for the most expensive, most profitable niche sector. Later you expand to the mainstream sector. See Christensen's book, "The Innovator's Dilemma." Automobiles began as luxury toys for wealthy young men. Microcomputer hard disks in the 1980s began as expensive and unreliable peripherals for people like me, who really needed 5 megabytes of storage. We were willing to pay more per megabyte than the minicomputer and mainframe hard disks cost back then.