drips from flue

[JOPLUMB]

hi, my mum had a new full central heating with condensing boiler installed about 8 months or so. the problem is the flue is dripping over her path and causing a slip danger. she has put a bucket under but should she have to .i know it is condensate but can it be diverted. cheers

 

[moderator]

Your post has been moved.

Could you please help with a question.

Did you post in general diy because you wanted to or were you directed here?

many thanks

Lynda, moderator

 

[Trance Nation]

Id be tempted to say that the flue is not correctly installed. Condensing flues should run back to teh boiler and such condensation is discharged through a drain in teh boiler.

 

[kevplumb]

flue is sloping the wrong way

 

[JOPLUMB]

thanks for advise , i will look for boiler manual to check.

 

[diyisfree]

Why look for boiler manual ? just call the plumber back to do it right.

 

[2face]

as above it is running the wrong way .

 

[Agile]

If it were freezing outside then it could be quite dangerous! ( Slip, fall, break bones! )

The installer should be called back.

If he refuses then complain to CORGI as it is a flue fault and they will get the installer to sort it out ( assuming he is CORGI registered ! )

Tony

 

[JOPLUMB]

thanks for help everyone , just to let you know the installer has been back 4 times for other probs in past and now his phone doesn't answer...
he was recommended by merchant and is corgi reg.
we probably try another installer or engineer to sort out, and corgi will be informed..

he also fitted gas fire and removed liner from chimney , saying not needed. but now have no cowl on top of chimney. is this normal?

 

[namsag]

Yes normal as cowl removed is five inch diameter and this is too small for a lot of fires. The flue should slope downwards towards the boiler most have this angle buit into the appliance elbow...

Some boilers flues drip a bit from the terminal even with the flue correctly installed but not that you would need a bucket

 

[Agile]

You should not call another installer.

Call CORGI and they will inspect free and issue a defects notice if its wrong.

Note that some flues have the slope built in and the outer should be horizontal.

Others have a built in slope but the manufacturer still asks for a slope on the outer.

I have once seen a terminal with an excessive ridge causing water to build up on the outer side of the ridge and get blown off the end. I filed a groove in it to allow the water to run back.

Tony

 

[Mr P Patel]

Tut, tut Mr Agile
I believe that changing any flue spec is highly dangerous.
Are you sure this is wise. !!!
I Have never read in ANY MI's that it is ok to file a flue.

 

[Agile]

The moulding was outside the normal tolerance and I was just bringing it closer so that it performed corectly.

 

[namsag]

Agile disagree with you that a boiler is designed to allow the outer tube to be horizontal and the drop built into the inner . Most outer tubes are 100mm in diameter with the inner tube 60mm in diameter thus a 20mm gap around the inner. Well standard condensing boiler flue fall is 3 degrees which is over fifty mm over a metre .

So there is not the room to achieve this fall on a flue above 400mm in length so either the top of boiler must be angled or the more easy way the appliance elbow having this angle built in with the outer and inner tube following this angle its entire length

 

[Agile]

You have quoted a 3° slope as if that is a fixed requirement. In reality its whatever the manufacturers think is best for their boiler.

If you look at the Ideal/Biasi MI you will see that they say the built in angle is adequate and the terminal length should be installed horizontal.

Amusingly, Halstead ( ? ) use exactly the same flue and ask for a slope on the outer as well !

Tony