I had a new boiler installed with a closed loop system. Is it still necessary to have a dielectric connection between the copper and steel pipes?

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Originally Posted by ahn79

I had a new boiler installed with a closed loop system. Is it still necessary to have a dielectric connection between the copper and steel pipes?

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Yes! Dielectric unions,(see image) and used to join two dissimilar pipes together to prevent electrolysis. I have put up a link to a tutorial that may be helpful. Good luck, Tom
Installing A Dielectric Union To Join Galvanized And Copper Pipes - Plumbing System Components