Must balanced flue inner and outer be the same length?

[pipcart]

Hi. Our builders hit a problem with extending the balanced flue through a new extension. Their solution was to have the outer, intake pipe terminate at an external wall, but add an extra section to the inner pipe to take the exhaust away from the next house. However, the gas boiler was repeatedly shutting down and they have had to remove the extra pipe for now. The boiler is a GlowWork Flexicom.

Can anyone answer these theories as about why the boiler might be shutting down:

1) The inner and outer pipes should end at the same point
2) The extra pipe has two sharp bends, which is causing extra resistance
3) The weather is very cold, resulting in excess condensation on a 2m external run of flue.

Any other ideas gratefully received.

Many thanks in advance.

 

[Riley]

Pics please sounds like a plume kit to me

 

[Riley]

Also why is a builder touching your boiler

 

[pipcart]

Pics please sounds like a plume kit to me

Thanks Riley, I'll take some pics in the morning. The builders have subbed this to a plumber/heating engineer (allegedly).

 

[Riley]

Did you ask to see his credentials

 

[townfanjon]

Here we go !!!

 

[Allgoode]

Sounds like the Circus is in town with a clown, aka - builder............

 

[Sharp Point]

This is a wind up.

 

[kris]

The bends your describing are fine if they indeed are a plume kit , ( I'm not saying the installation is fine), however you say they've been put in to take combustion away from a nieghbouring house so sounds a bit alarming and Defo needs a gas safe registered engineer to check rather than a builder as for all we know it's been dangerously fitted and struggling to work, please contact your local engineer to have a look ,

 

[pipcart]

Thanks for your replies, everyone. The bodge arose because the planned vent through the extension roof was not possible. We think we have a better solution now, but will take up your suggestion of getting 3rd party qualified opinion. In the meantime we would like to dispute the installation I have sketched. Further research tells me that the inner and outer pipe ends need to be in close proximity and the sketch shows significant separation.