Do I need a dielectric union for copper to stainless steel?
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Keeping this in consideration, can I connect stainless steel to copper?
When two dissimilar metals are directly connected together, the lesser of the two metals experience galvanic corrosion. When stainless steel is directly connected to copper, copper galvanic corrosion occurs. According to Copper.org, the stainless steel plumbing pipes corrode.
Also, where are dielectric unions required? Dielectric union requirements. I will typically specify a dielectric union to be installed whenever dissimilar metals are joined. When copper and steel pipe are joined, the steel pipe will corrode due to the galvanic action.
Consequently, do I need a dielectric union for my water heater?
Dielectric Unions If either the tank nipples or the pipes are galvanized steel, however, and you are connecting them to copper, you must use a fitting called a dielectric union to make the connection. Both the hot and cold water pipes must have this fitting -- it's a code requirement.
Do you need dielectric union for copper to brass?
Re: Dielectric fittings The 2 different metals will corrode each other. You should use a galvinized nipple in the tank and a galvinized/brass dielectric union. Brass is considered compatible with steel and can serve as a dielectric fitting between copper and steel, which includes the tank.