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non ferrous circs for non-oxygen barrier radiant?

Recently isolated a 1990's butyl rubber radiant system from the boiler using stainless HX.  Original Grundfos 15-42 cast circs were still running, two now have failed - old boiler was a electric thermal storage unit - 800 gallon tank.  Will new cast circs (grundfos 15-58) have a chance of living a long productive life as the 15-42 did or should we insist on using stainless circs?  Now that the circs are the only iron part on the radiant side of the HX, will they degrade faster?

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