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Toyota builds experimental hydrogen-powered pizza oven and grill.
(www.autoblog.com)
This is a most excellent place for technology news and articles.
Burning methane also produces steam. Methane produces 891 kJ/mol, hydrogen 286 kJ/mol, methane has four hydrogen atoms that'd be 1144 kJ per what should the unit be in any case: Methane produces less heat per unit of produced water than hydrogen (the hydrogen first needs to get ripped off the carbon). Those ovens burn dryer than your current gas oven.
Never used steam when making pizza, they're not in there long enough for steam to make a difference. For bread it's indispensable to get a proper crust, though.
EDIT: Did I get moles right? It's been a while and I am no chemist.
Huh, fair enough!