If we supply a booster system with stainless steel headers and it is piped to copper, will there be a galvanic reaction, and if so should we use a dielectric union?
If a Stainless steel is connected directly to copper, the stainless becomes the sacrificial anode for the total mass of copper in the entire building. The charge build up can be significant resulting in oxidation of the stainless steel. A dielectric union is recommended. Note that the flush lines are not a problem because it is very little copper connected to the stainless steel. In this case, the sensing line simply cannot build up enough charge (and hence dielectric current) to cause the stainless steel to oxidize.
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