When I added onto my house, the heating contractor connected new copper pipeing to the existing black iron pipe on the hot water heating system.The connection is copper threads to black iron threads, with no seperation. Will this be a problem because of the dissimilar metals? Thanks for any information. George
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Unless i misunderstand sounds like a classic galvanic action situation without a dielectric union interposed between the two.
Don't worry about it. Very seldom will this ever cause a problem. I have never seen it yet in hundreds and hundreds of heating systems. Now those dielectric unions? They will leak and cause you all kinds of problems.
Please note everything I just said is for hot water heating, not potable water.