Magnesium is less noble than aluminum, hence it makes a better anode. For this reason, any water heater with a long warranty is going to have a magnesium anode. However, if you have problems with sulfur smell in your water (like I do), it's going to be worse with magnesium than with aluminum. I replaced the original magnesium anode in our heater with an aluminum one; it improved the sulfur smell but didn't completely eliminate it. If we're gone for a few days the smell will come back.
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