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After heavy rain, water pools around our basement furnace. After climbing onto the roof, I found a mysterious (plumbing?) vent.
This post seemed relevant, but 0.5 gallons comes in after a good rain. It seems more than just a flashing issue.
There are 2 such vents on the roof, in addition to the original chimney.
This looks like a newer “vent “ & exhaust, I haven’t seen one quite like that but it looks like a coaxial vent & air supply for a closed system. I wonder if it is rain or a plugged condensate drain that is the problem because that small area would require much more rain to provide what I think you reported even at biblical proportions, I don’t think it has rained that much in our life times. So will a cap help , maybe but probably not. A hvac pro can probably find a problem in short order but I don’t think it could be rain.
Once winter concluded, I finally noticed that the water was trickling in through the basement wall due to poor grading outside the house. I thought the water was coming FROM the furnace and spreading elsewhere, but in reality, the water was coming FROM the wall and spreading to the furnace and elsewhere.
After a heavy rain, I put on a headlamp and closely watched little particles in the water moving towards the furnace.
