... I think that his technology has a root core that does indeed work.
In your view then, which part is described in Rossi's US patent (the one shown on the front page of his blog)? Is it the root core that works? It has to be, doesn't it, for that patent to be valid? After all, if he does not disclose the root core of his invention in the patent then what is he protecting?
Why hasn't anyone reported excess heat from following the directions in the patent?