In 3 years of his work, not a single report of a dissatisfied investor.
Rossi now says he is very close to a system that produces electricity.
Why have so many people lost the ability to believe there are new concepts in physics left to be discovered?
The people doing the test were not untrained. They are experts in the field who have put their professional reputations on the line. Being too good to be true is a red flag rule of thumb, but it isn't a scientifically reliable to refute a claim.
Generally you can take any claim of free energy and bet against it and come out looking like an expert... But consider this would be the second time the release of unexpected nuclear power surprised the world. I've been following this for two years and no one has found a hidden battery, a stash of chemicals, extra wires, bogus measurement equipment... But plenty of tests have been unconvincing. This one was the best -- a black box test done by university level professors and experts.
Rossi has filed a number of patents and many could argue that they're not detailed enough to let a lay person recreate the technology.. however, the fact is that the technology remains unproven AND there is NO evidence of a scam.
When Rossi heats a 1 meter cube of water N degrees in X minutes using P power that is less than any other known way to heat water, what then? Eventually, I hope, the blubbering from the peanut gallery will subside..
At some point in the very near future, we will see an even more convincing demo using flow calorimetry-- essentially heating water-- with an even more isolated electrical input (for instance, a UPS outputting a perfectly clean sine wave AC.) And then what? Eventually the skeptics are going to have to come around and admit that they were wrong. I'm looking forward to that day.