Copper connection to water heater

Originally Posted By: Tom Cameron
This post was automatically imported from our archived forum.

Can brass nipples be used to connect existing copper lines to a hot water heater in the place of dielectric unions? I heard somewhere brass was compatible with both steel and copper.

I have seen/heard a lot of talk about how copper cannot or should not be connected directly to a hot water heater due to dissimilar metals etc. But there seems to be controversy here? Anyone ever seen a heater fail when there was copper to steel involved? If yes how old was the installation?