Copper to copper dielectric fitting use - corrosion.

[Treetop]

Dielectric unions were used above my hot water heater with copper on both sides.

I recently purchased this house. The idea probably was to make it easier to replace the hot water heater by having unions present.

Now I see however the unions are corroding. Should I jumper across the unions to create a common ground connection?

If so, how should it be jumpered, above the unions between hot and cold, or connect all 4 points together?

See the attached image. Thanks in advance for the help.

 

[frodo]

doesnt appear to be a D-electric union, do not see the tell tail plastic isolator

and the top looks to be copper. dielectric is not copper x copper

remove and replace with a "regular" copper union

http://tse1.mm.bing.net/th?&id=OIP....ee19c6o0&w=300&h=300&c=0&pid=1.9&rs=0&p=0&r=0

http://tse1.mm.bing.net/th?&id=OIP....03f9beo0&w=300&h=300&c=0&pid=1.9&rs=0&p=0&r=0