Can we all agree, including kirkshanahan hopefully, that a device which has a 50W input and a 250W output when a comparable blank/control device has the expected 50W out- can we agree that such a result would not be negated by any type of conceivable calibration shift? That, of course, is the performance level claimed by Mizuno. If we agree on this, then we are back to concluding that Mizuno has some sort of stupendous mistake (like a decimal point error) or dishonesty or the only alternative conclusion is that Mizuno has invented a novel "anomalous" heat source, no? Are there other options?
I also agree. But, in the CF/LENR history, these claims are not at all extraordinary. F&P claimed in 1992 to have obtained more than 150 W output from 4 cells in a row, with less than 40 W in input. These are very similar figures, but much more important than Mizuno's, because they were claimed 27 years ago, by the fathers of CF and, most importantly, they are fully documented in videos available to everybody.
The big problem in replicating Mizuno is that no replication from an independent third party will solve the main dilemma: mistake or novel heat source. The Mizuno's claims are based on numbers which come at the end of a long and complex procedure: preparation of specimen, set-up of the experimental apparatus, running of control and active tests, data-logging, calculation of derived quantities, energy balance and, finally, the claims of excess heat. A possible major mistake could be hidden in any of these steps. If the replication will show no excess heat, CF believers will complain that a mistake was made in the preparation of the specimen, the esperimental system or the testing procedure. Vice versa, if the replication will find some excess heat, CF skeptics will complain that measurements or calculations were wrong. Such independent replication will be in anyway inconclusive.
Claims such as Mizuno's can be confirmed only by the market. When you'll find Mizuno's heaters (3 kW in output, 1/10 in input) in the stores, you will know that his claims are true. Mizuno does not need the curiosity of an independent third party, he only needs the attention of as many as possible "very interested parties", willing to know as soon as possible if his claims are true in order to make a lot of money by making and selling his devices.
On the contrary, the same dilemma (mistake or novel heat source) can be easily solved for the "1992 boil-off experiment" of F&P. The availability of the lab videos would allow the Google's replicators to ascertain and demonstrate to have been able to replicate the same physical phenomenon produced by F&P, so that they will finally be able to find out whether the claims of the two CF's pioneers were due to a big mistake or to the actual discovery of a new energy source.
