Especially if it s not sealed properly.
Boiler flue through conservatory roof.
Think of it this way.
However if a vertical flue is badly fitted then yes you could have a leak on your hands.
However to comply with the approved document j of the building regulations the flue still needs to rise a total height of at least 4 5m unless the appliance manufacturer specifies less.
If the flue terminal is more than 2 3m away from the taller main house then the flue does not need to rise above the main roof.
Note teh gsiur make this a criminal offence not just a matter of a tiff with.
No boiler builder will allow to put a elbow out and then a vertical channel through the roof of the conservatory as the terminal would be too close to the wall of the house.
How far this is will depend on the size of your boiler but is typically between 30 60cm above below or to the side of an opening.
Under the boiler flue position regulations the flue has to be positioned a certain distance from any parts of the home that can be opened up such as windows and doors.
The flue won t get hot since even the inside compartment is only designed to take warm and wet gas and is itself made of plastic so there should be no problem with going through the polycarb roof.
Can a boiler flue go through a conservatory roof.