It is relatively common to have
this rotten egg odor in hot water only.
This is because the water heater's "sacrificial" anode rod is to
blame. This rod, made of "magnesium",
helps protect the tank lining from corrosion; instead, the rod itself
corrodes. Unfortunately, as it does, the
magnesium gives off electrons that nourish 'sulfate reducing bacteria' – the bacteria
that eats up the iron particles, and in the process releases the sulfur
smell. Removing this rod may eliminate
the problem. Some have found "aluminum"
rods can be installed with success.
Once you get 'sulfate-reducing
bacteria' in your water heater you will want to get them out. Even if you drain your water heater and/or
change the anode you may still have the bacteria. But, there is an easy way to kill them
off. To eliminate 'sulfate-reducing
bacteria' from the water heater, you need to raise the water temperature above
140 degrees for 8 hours. Bacteria die
out at temperatures above 140 degrees.
To safely follow this procedure, first make sure your water heater has a
functioning temperature and pressure relief valve. "NOTICE" to prevent accidental scalding; warn
users not to use the hot water faucets until otherwise notified because the water
will come out of faucets extremely hot and should not be used at the increased
temperature. OR better to be safe, turn
off all hot water supply lines to sinks and faucets prior to increasing the
temperature and place a note on the fixture that hot water is not currently
available.
When working with Hot Water
Heater internal components always consult with your local plumber or building
department to ensure that proper procedures are followed to replace or repair
any part on your hot water heater.
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