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Barb,
Last year, I also had the egg smell after about a couple of months after installing a new water heater. Apparently, according to the manual, this smell is from the interaction between the water and the anode rod that is in the tank. The anode rod is there to keep the tank from rusting, and removing it will void the warranty. However, the manufacturer should sell a different rod that will cut down the egg smell. The chemical reaction of the rod and water causes the sulfer smell.
If you completly drain your tank (turn it off at the breaker box first, then turn off the water feeding the tank)and then refill it, the smell will go away for another month or so. If you leave the tank sit for a few days without water circulating, it may come back again. If it does, drain the tank like before. That’s the best help I can offer!
For me, I’m tempted to just remove the rod and forget the warranty…
Dave G.