Yeah, but you're not German, are you?

Seriously, the amounts are quite low, certainly not enough to present a fire hazard of any sort. There is ample scientific evidence published in multiple peer-reviewed journals:

"Effectiveness of Hydrogen Rich Water on Antioxidant Status of Subjects with Potential Metabolic Syndrome—An Open Label Pilot Study"
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2831093/

Whenever I come down with something, such as a UTI, combined hydrogen water and breathing hydrogen gas clears it up in short order.