Reasons for Dripping Flue

[Julian Such]

Is there an obvious cause for a dripping flue on a newly installed condensing system boiler? not constantly but enough to form a damp patch on the patio below.

Thanks

 

[Harvest Fields]

Is there an obvious cause for a dripping flue on a newly installed condensing system boiler? not constantly but enough to form a damp patch on the patio below.

Thanks

It should be pointing upwards slightly for the condense to run back to the boiler.

Any pictures

 

[townfanjon]

It is a problem for manufacturers, from what I have seen most do it to a certain extent .
As ^^^above it should fall back to the boiler , can you see a slight “fall” backwards.
Some flues however will appear level , the “fall “ is built in to the flue .
Whos the manufacturer?

 

[Harvest Fields]

Town is also right. What make and model of boiler do you have?

 

[Julian Such]

Viessmann vitodens 200w

 

[Harvest Fields]

No that clued up on veissmann to be honest. But the flue pipe outside should look at least level. (The fall may be on the inner flue pipe) sometimes you can get an odd drip from the terminal but depends on a few different factors.

 

[Sharp Point]

Yep, even on correctly installed horizontal flues, they can drip ... unfortunately

 

[townfanjon]

Viessmann vitodens 200w

The flue should fall , its not built in the flue , ie the installer does it .

 

[Scott_D]

It does happen in colder months
You can’t always angle the flue back or rain water can get in.
Some manufacturers make a deflector for the end that can help

 

[garygvl]

It does happen in colder months
You can’t always angle the glue back or run water can get in.
Some manufacturers deflector for the end that can help

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