This is what we found:
1) From a pipe with hot water
2) The pipe goes all the way up the roof to the roof itself
3) The pipe comes from the TOP of the hot water cylinder (i think)
We turned off the valve feeding cold water into the hot water cylinder
The in-laws' cylinder is very old ... not sure what brand
It is a low water pressure kind (no jet shower in their place)
... if that helps ....
Will that stop the problem (I can't see a hot water outlet valve to turn off!)?
What the hell is the pipe that goes to the roof itself? Can't be the vent? If it's the vent why the hell is it leaking right at the roof itself?
THanks for any hints ...
I know we have to call a plumber tomorrow but just curious ...
Edit: image
