Originally Posted by Arctic Owl
Flush your Hot Water tank & heater. Will likely fix the smell problem.
Excelent advice.. There is a bacteria that builds up in hot water tanks believe it or not, thrives at 100-140 degrees, and releases sulfur dioxide.
YOu might also sanatize the hot water system. Would not hurt. (or the entire water system) standard "De-winterize" sanatization 1/4 cup bleach per 15 gallons of water, run it through, then rinse, then rinse with backing soda, then rinse again. (Baking soda say 1 cup per the full water tank)