My heater is installed in the basement. It has two PVC white pipes from the heater that go into the attic where they are joined together and then exit the roof. I have had water drip off the PVC pipe over the years and it finally worked its way through the insulation and now it has worked through the drywall in the ceiling. I checked it and the water drips off the PVC pipe where it changes direction as it goes up toward the roof. Now, each time when the heater comes on and it is cold outside, there is a steady slow dripping of water. What can I do? Thanks.