Hydrogen sulfide from hot water only

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BurleyMike

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My parents have a small laundry room in their garage. They have a 20 gallon water heater that supplies the washing machine and a utility sink. The water heater gets very little use probably 5 gallons a week or less.

After using this setup for about 1 year now the hot water side is starting to get that lovely hydrogen sulfide smell to it. They are on city water which has me stumped. I have run into this before with well water but thought city water being chlorinated would not have this problem.

What is the best way to remedy the stink?
 

LLigetfa

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One would think that city water would not have bacteria but none the less, you might try raising the temperature a bit to make it less hospitable for the odour causing bacteria. Changing out the anode to a different type might help. Some have even removed the anode (at the risk of a shorter tank life).

Lastly, it is possible that bacteria established a foothold in the supply line after the heater so removing and sanitizing it with bleach is worth a try.
 
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