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Posted by Craig on October 22, 2007 at 10:43:52:
I'm in the process of installing a Weil McLain ultra 105 boiler. The inlet and outlet water connections on the boiler are stainless steel. The fittings supplied by Weil McLain for the overpressure relief valve which connects to the outlet water connection are cast iron. The boiler loop as well as the zone plumbing is copper and brass. Since the system is closed loop and will contain a glycol/distilled water mix, I'm assuming that there should not be any sort of problem caused by incompatabilty between the different alloys. Let me know if I'm correct in my thinking.
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