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Hydrogen formation in water heaters

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Spacemouse

Mechanical
Nov 7, 2013
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I was reading an installation manual for a tank-type water heater and in had a warning of accumulation of hydrogen gas in water heaters where hot water is not used for weeks.

I did some searches online and it it seems to be linked with reaction between the sacrificial anode in the water heater tank and bacteria in the water (which seems to be even worse if using a water softener)that produces hydrogen gas and hydrogen sulfide gas. I am still unclear how this happens. Any thoughts?

Also, should this be of concerns with designing water heater installations where hot Katerina is infrequently used (such as water heater for emergency shower/eyewash)?
 
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