A "Hot-Cat" is the high-temperature version of the E-Cat, the Energy Catalyzer invented by Andrea Rossi, a reactor which provides clean energy at an extremely low cost. The first step to be taken in order to replicate in your laboratory a so-called "Hot-Cat 2.0" - i.e. a last generation Hot Cat - is to understand how it is done and what are the differences between an original "low temperature" E-Cat and a modern Hot-Cat. Reading this book, the reader will understand perfectly how the new Hot-Cat 2.0 is a much more sophisticated apparatus than you might imagine from an its superficial analysis. The book is aimed primarily at those who, having already understood the basics of an E-Cat, want to move on to an industrial product, or, that is to say, a second-generation E-Cat, requiring a better knowledge of the E-Cat technology. Many people still think of the E-Cat with old patterns, but the evolution of this product has finally led from what was apparently a rudimentary reactor prototype to a real small gem of science and technology.