ah, Itshould be rather named "Steam Plant"?
Umm, I'm not sure if this can be called a reactor. Reactor is named so because something reacts with something inside it: uranium with neutrons in nuclear reactors, coal with oxygen in furnaces, coke and other chemicals in batteries... This is basically a heater, like, for example, a sparked piece of tungsten. But it's an interesting way of using the GoL.