What they have is a water heater, a tea kettle.
So they calculated energy output by measuring temp into the reactor, temp out and flow rate? That seems straightforward enough. Why not just shut off the output and let the water temp increase until you produce steam? If they truly have produced 475 Kw over 5 hours (95 Kwh or 324,000 BTU), that's more then enough energy to boil water. For crying out loud, you can boil water in a paper bag with a candle!
Regards,
GtG
PS BSME 45 years ago, enough thermodynamics to know there is no such thing as a free lunch. If this thing really works, prove it by demonstration or quit messing around with gullible people.
I suggest you look at the actual reports issued from the various demos. Checking the videos also helps. There is a lot of info available that is basically being "blockaded by FUD" from a community of knee-jerk naysayers. I suggest starting at the LENR/CANR website. Pay particular attention to the third experiment (no-steam, high flow, fifteen hours test).