Also, in the UK, I have an open header tank in my loft for my central heating system.
This is kept topped up via a mains feed and the flow is controlled by a ball cock and valve (not sure what that is called in the US (if you are from the US)).
If the valve gets stuck in the open position (and it has done) the overflow comes out through a cpvc pipe that exhausts just under my eaves.
If you have a similar system, it could be that. Anyway, as Mr Wright says, you might need a professinal to check.
This is kept topped up via a mains feed and the flow is controlled by a ball cock and valve (not sure what that is called in the US (if you are from the US)).
If the valve gets stuck in the open position (and it has done) the overflow comes out through a cpvc pipe that exhausts just under my eaves.
If you have a similar system, it could be that. Anyway, as Mr Wright says, you might need a professinal to check.
