Rockycmt
Member
I have a NG boiler in my below grade basement. Live in NY area. Have had 2 major rain storms this past month. Both caused some water entry near my boiler. I seen water dripping from a horizontal section of my vent. I am not sure if it was rain entering from the chimney opening or groundwater accessing the bottom of the system. There is a vent cover on top of chimney but the rain was sideways for days. Is this a common issue? What is the usual cause. I am leaning toward ground water against the house.