Stainless and copper can be sweat connected. I've seen it done with boiler systems- usually the boiler systems of engineers who worked at Kodak when Kodak was famous for being the stainless hardware supplier to felonious employees. I've never seen any sign of galvanic corrosion though- the 98:2 tin/copper solder likely isolates the dissimilar metals with an atoms-thick loving layer of protection.
source https://www.inspectorsjournal.com/topic/18815-silver-boiler-piping-id/?do=findComment&comment=172244
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