Cold fusion or LENR devices are apparently much easier to build than some people assume. An Italian high school science teacher and his students have reportedly built, tested and patented a device similar to that used by Pons and Fleischman to start the low energy nuclear reaction movement back in 1989.

Athanor workshop at Pirelli High School in Rome
The teacher an engineer named Ugo Abundo had students in a science class at Leopoldo Pirelli High School in Rome build what he calls an Athanor LENR reactor. The device is supposed to be an electrolytic cell that produces a coefficient of power or cop of 400%. That means it put out 4x times the energy that goes into it.
Pirelli High’s website gives a slightly different version of events. It states that a group of students took part in a sun lab overseen by four teachers. They apparently built and tested five LENR reactors one of which has been patented and will be tested by the scientific community.