How much hydrogen is given off?

A trace amount mixed with steam. An hypothetical situation: "There are 15 men inside the cabin of a fire truck. It is winter and the doors are shut to keep in the heat. How many heaters can be activated at one time?  Make sure there is plenty of ventilation. By doing this, there is no problem in activating 15 meals (one for each of the men). Always activate the heaters in a ventilated area.

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