Water dripping into kitchen from boiler flue pipe

secret-stu

Hi, really hope someone may be able to offer a bit of advice/guidance.

I had an old oil boiler removed from my kitchen in June and the heating engineer left the metal corrugated flue liner in place and just crushed the end of it and pushed it up into the chimney void.

All summer things have been fine, we have had some very high winds and a lot of rain and not a drop of water has come down the liner. But since the central heating has come on and the temp outside has dropped, we have a constant drip of water coming out the end of the flue liner onto the kitchen floor.

I went up onto the roof to have a look and the metal liner comes up through the chimney stack and terminates into a metal pipe that sticks out of the stack (no clay pot) this in turn has a metal rain cap on it.

Looking down into the metal liner there is a lot of droplets of water on the inside of the flue liner that are dripping down the liner which are then ending up in the kitchen, it’s not a huge way to travel as it’s a bungalow.

So, any ideas how I can stop it and why its happened? I’m guessing its condensation formed by the warm air from the kitchen meeting the cold air coming down the metal flue pipe, but I assumed this would be the same for any set up like this.

Whether the heating engineer by crushing the end of the pipe in the kitchen has caused the issue I really don’t know.

Thanks in advance

 

shiraz99

I'm struggling to visualise it. Can you post some pics, both inside and out please?

secret-stu

shiraz99 said:

I'm struggling to visualise it. Can you post some pics, both inside and out please?

Ill take some tomorrow (pitch black now) and post them thanks 

JohnB47

I think you might be right about the moist air going up the metal flue and being cooled down and causing condensation. Presumably then the crushed end is not fully sealed? 

I would think it an idea to fully seal the lower end of the liner but only if there is absolutely no way that water could get in at the top. Otherwise it would be best to remove the liner completely, put a vent grill at the lower end and put a cap over the hole up at the chimney stack.

Has the liner been mortared in? I e. how hard woul it be to remove it?

plumb1_2

When he decommissioned your old boiler he said have removed the liner and capped it off, not just bash the end and stick into the wall. That’s the difference between a good tradesman and mediocre.
 With it only being a bungalow and you are ok with going on the roof, remove the cowl,plate and liner..
 Get a bucket of mortar fit a terracotta pot and a vented cowl.
 Alternatively phone him up and tell what’s happening and ask why he left it like that.

secret-stu

pictures as requested . 

secret-stu

When he decommissioned your old boiler he said have removed the liner and capped it off, not just bash the end and stick into the wall. That’s the difference between a good tradesman and mediocre.
 With it only being a bungalow and you are ok with going on the roof, remove the cowl,plate and liner..
 Get a bucket of mortar fit a terracotta pot and a vented cowl.
 Alternatively phone him up and tell what’s happening and ask why he left it like that.

He just crushed the pipe and pushed it into the hole 

Not sure if the liner is somehow clamped into the stack ?

secret-stu

JohnB47 said:

I think you might be right about the moist air going up the metal flue and being cooled down and causing condensation. Presumably then the crushed end is not fully sealed? 

I would think it an idea to fully seal the lower end of the liner but only if there is absolutely no way that water could get in at the top. Otherwise it would be best to remove the liner completely, put a vent grill at the lower end and put a cap over the hole up at the chimney stack.

Has the liner been mortared in? I e. how hard woul it be to remove it?

I will need to remove the rain cap and have a look to see if the liner is clamped into the stack i guess,this is something the heating engineer should have done i am now thinking

twelvegoldbars

its just condensing within the flue pipe..,remove it and just cap it off on the stack,any warm air going up the old flue will condense.