We winter in Florida summer in Massachusetts. When we turn on the hot water we get an offensive odor...sort of like sulfur or rotten eggs. We have drained the hot water tank and rinse out with bleac...
Cleaning out the pipes with peroxide or soda and flushing the tank. It is an Atwood. Another help possibly, is much of Florida's water supplies has a lot of sulfur. You probably already use one though. A small .5 micron or possible one not even that small will get the sulfur compounds. We have to change or clean the filter after a few days, because of the sulfur.