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Selgas.
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MasterPlumbers
I have been told that a di-electic union is needed between the galvanized inlet and outlet of my new water heater and the copper pipe. Currently there is a brass fitting between the copper and galvanized waterheater nipples. Does the brass going to stop the problem the the di-electric union is needed to stop? Thanks for any clarification as to the need of this union,
Mike. -
The union has a plastic clip and a rubber washer that interrupts the continuity through the two metals which slows down electrolisis.
The connection you have does not.
I always use short brass 3/4 nipples and female dielectric unions on all water heaters.
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Using a 6 inch brass (low zinc type) nipple is considered an adequate connection between ferrous and cupric pipe, and it will perform as well as the dielectric union.
NtP
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We use dezincdefied (poor spelling here) brass fittings on cylinders for exactly the same reason.
Selgas Services Ltd
Craftsman Gasfitters, Plumbers, Electrical Service Technicians
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