If you know the efficiency, you can make as much liters as wished, efficiency of electrolysis is known and won't give surprising results when trying to reinvent it, how much l/h would nasa generate for their rockets ;
perhaps with pulsing it wont heat up so much - it won't give you more than faraday's limit of, what was it, 60 percents?
this is a demonstration of a different approach.
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based on drstiffler's work, he is known for his practical approach and without too much theory.
i posted some articles captured to pdf, which are not available anymore on his site. the rapidshare link has expired, if you don't have the files anymore i'll fetch em from my other hdd. [e.zip]