Looking into the Magnesium vs Zinc thing. What I know
is that Magnesium anodes can react with sulphates in the water to produce Hydrogen Sulphate (aka stink). I believe
that this is less
of an issue with zinc.
Digging deeper; I looked through the Isotemp website for user manuals. Here is the link: Isotemp Slim & Basic
What I found after skimming a couple of them is that there is NO reference to the anode for an IsoTemp Water Heater
. This leads me to conclude that there is no anode! ("There is no spoon."
Theory: there is bacteria in your fresh water tank, and the temp (>160°F) is killing them in the water heater. As the bacteria decompose in your HW tank, excuse me...
, other bacteria are producing hydrogen sulfide.
Possible solution: Chlorinate your entire freshwater system, and then flush with CLEAN water from a different source than you usually use.
I have used swimming pool shock for my (new to me) boat, which had sat unused with full water tanks all summer long. Swimming pool shock is (calcium hypochlorate
). Others prefer bleach (sodium hypochlorate
) to chlorinate the system. If you want my rationale, follow the links that I provided. What ever you use, hit it hard, and flush it out several times before using.