Good Modulating Boiler for NG

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I want to replace our boiler with a new NG unit. I have read alot about these new modulating boilers like Weil-McLain, but I have also heard to stay away from ones with aluminum heat exchangers because of corrosion issues, especially with NG.
Is this really an issue? If so, which ones have stainless steel? We have a system with fan coils as well as one small radiant loop.
Thanks.
Don

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