boiling gets you only h20 vapors... if it produced hydrogen that sure would make cooking spaghetti dangerous.
Millions of dollars have been offered for someone who can create a free energy or sustainable energy machine. Nobody has yet to achieve it. If they did, it would solve so many problems in this world. There's no oil company or government conglomerate running around assassinating people. You can use the internet for censorship, place the plans online, and they'd spread like wildfire. Completely untraceable.
The evidence that they don't work and don't exist is the fact that this technology hasn't shown its face in the internet age, where no longer conspiracy theories about inventors being assassinated stands up.