How can you eliminate a hydrogen sulfide odor in the water from a new hot water heater even after the anode has been replaced with an aluminum one?
You need to replace the aluminum anode with a zinc/aluminum alloy anode.
ANS 2 - If a hydrogen sulfide (or rotten egg) odour exists around your water, it's often an indicator of excess iron in the water supply. This can be bad for your plumbing. I would advise taking a water sample(in a sterilised bottle) to a lab and have it analysed. If the iron content is very high you may well have to fit a softener or an iron filter.
BTW - changing the anode is an excellent idea anyway. Just may not be the solution.
The black tarnish on silver is silver sulfide, Ag2S. Presumably you are boiling silver in a metal pot. The salt water completes an electrochemical cell between the silver sulfide and the aluminum, copper, or iron pot. The oxidized silver in silver sulfide is reduced to silver metal, and part of the metal pot is oxidized; the reaction happens because silver wants to be reduced more than the other metals do. You might imagine that as…