While looking for additional insights about how the E-cat works, I visited this page, which I have visited before. Although I found nothing new there, it did answer another question that arose of late- how does the energy manifest itself?
In conclusion, it should be underlined that the copper nucleus thermal perturbation, as a result of its mechanical backlash(heat), is transferred to its encompassing nickel lattice and propagated, by in phase phonons (G. Preparata), through the entire nano-crystal. This could explain why in cold fusion the released energy is mainly in the form of heat and the produced (low) γ radiation can be easily shielded.[emphasis added]
Heat as an energy source isn't exactly what we want. It needs to be converted into electricity. Therefore, as a useful energy device, it needs to do just that. A Stirling Engine can do this, for example. Or, you could make steam and that would turn a turbine that produces the electricity. The significance of this is that, even though it produces energy, we won't be able to use all of it. There will be energy losses.
By the way, this paper gives more detail about how the E-cat works. As for me, it goes over my head a bit, as it is a bit technical. Andrea Rossi is also a frequent commenter on this page.