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The two metals don’t touch hence the dielectric union Brass is a nonferrous metal also just like copper and the tank of the heater is steel (ferrous metal). But that was the thinking so far as to replace with brass this time. I have just never seen any other ones this bad and reoccurring.

Building is all sch80 cpvc only copper at water heaters

There are ground on the copper also just not shown in pic

Another pic

Have an issue maybe some one can help with this is on water heaters in a hotel we did a couple years ago replace the nipples and dielectric unions about 9 months ago due to the same problem now it is this bad again and needs to be replaced again. Thought was due to electrolysis but all have been...