I have a mod. con. boiler that got water and then rust in the cabinet from intake air condensation (separate and not related to the condensate drain). The venting setup is a concentric wall vent that splits inside between combustion air and exhaust. The manuf. is now suggesting to go to full concentric pipe all the way to the unit in order to help preheat the combustion air…
I'm thinking that condensation will still be a problem. Thoughts?
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