GeoSpring Hybrid Water Heater - Sulphur or Rotten Egg Smell
If your hot water has a strong sulfur smell, it is typically the result of the specific water chemistry in your area reacting with the magnesium anode rod which is the industry standard anode rod included in all water heaters.
The problem is most common in well systems, either private or municipal. An aluminum anode rod is available through GE Appliance Parts and can be replaced by a qualified plumber.