On your mention of Silver solder, do you mean typical circuit board silver solder or the "real" silver solder, such as used on copper tubing in high pressure refrigeration systems? I used the "real" silver solder to solder 3/8" copper tubing to Stainless Steel Ground rods below ground level.
I use KappTecZ when the joint is likely to have direct earth exposure or stress in the joint, although regular solder or "silver solder" from my wife's stained glass stuff has never given me problems above ground. KappTecZ solders almost anything very well with the correct flux.
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