dielectric union

Going to install a new Bradford White 50 gallon gas water heater. It has the typical dielectric steel nipples with heat saver. Heard and seen too many issues with those combination steel and brass dielectric unions. So I was thinking about using a solid brass NON-dilectric simple pipeunion...

I'm the facilities manager at a not-for-profit youth center. I need to deal with three 1 1/2" dielectric unions (code requirement) on two 100 gal. water heaters. At least they appear to be 1 1/2". In each case a ring of corrosion has formed around the steel side of the union/galvanized nipple...

I was looking at a thread from around 2015 where you showed a couple of great photos of the interior corrosion of a dielectric union. Our house water is sourced from a well that has hard water (we have a softener). Dielectric unions (and maybe galvanized pipe more generally) seems to be really...