Anode rod

[kroghville]

I'm thinking it's time to replace the anode rod in my water heater. Which is the best to use, Aluminum or Magnesium? Thanks,

[bob213]

Depends on your water source. Magnesium dissolves faster in high mineral water and may give off a sulfur smell. Aluminum will last longer in this situation. If you use a good water source (low in minerals) then the magnesium should work fine.

[oldelmer]

I think the magnesium ones have a weld spot on the end of the bolt head. So looking at the head of the bolt, in the center, there is a round protrusion sticking out, maybe 1/4 of an inch round.

Look and see what is in yours.

[attuco]

Magnesium is more reactive. It protects better but will wear faster.

[downtheroad]

If you have a Suburban water heater use the aluminum rod.

[Jim_Cindy]

The only ones I know of are aluminum. Take old rod or water heater model
to RV Parts store. Not expensive.