Is there a way a non-plumber can do something about the plume? Our
neighbours haven't complained yet, I don't think I'd blame them if
they did but I'd like to pro-active and sort it beforehand. The
exhaust pipe is horizontal and has two larger diameter pipes
surrounding it (cooling fins??) and the whole thing is covered with a
what resembles a deep-fat fryer basket.
No. There's plenty you can do as plumber, though. Basically, the plume can
be usually be eliminated by using a long vertical flue section up to the
roof line. Even if that doesn't eliminate it, the plume will at least then
be in a location that isn't a nuisance.
Don't even think about trying to modify the flue outlet yourself. This could
result in death (and possibly manslaughter charges).
On Thu, 27 Nov 2003 15:20:24 -0000, "Christian McArdle"
AFAIK all condensing boilers are room sealed (balanced flue) so
blocking the flue would pose no significant risk even if it caused
the burner to produce significant CO output. Extending such a flue
is impractical is it not?
Not necessarily. It really depends on the individual product so one
would have to refer to the manufacturer.
There are some where the flue system is/can be implemented using 50mm
high temperature plastic waste pipe which can be run to 20m if you
Some are concentric and can do the same thing - for example in Germany
in multiple occupancy buildings it is common to have a boiler per
apartment and to run the concentric flue vertically to the roof from
Mine has a choice of either, and I have a concentric system with 125mm
outer and 80mm inner. If I wanted to I could extend just the
outlet from where it comes out of the wall to take it to a more
appropriate position for discharge. It is a moot point because
there is very little plume anyway.
I am sure that a lot of the flexibility comes from having the boiler
In most instruction books that I have read where long flues are
possible, it does make the point that horizontal runs should slope a
little towards the boiler so that any water deposited in the flue
returns to the boiler. This could make very long runs inside a bit
To email, substitute .nospam with .gl
I seem to recall that some systems allow more unusual routings, provided
that intermediate drainage points are provided to collect the condensate,
rather than relying on it to travel all the way back to the boiler trap.
telephone email@example.com (Lysander) wrote in message
I did so with mine, quite easily, using a chunk of scrap
stainless-steel sheet. In my case, the plume also emits horizontally,
from an outlet about the size and shape of a can of beans ['A' in the
ascii art below]. Using a cardboard template first, I just cut and
bent the sheeting into a bracket-like gizmo; this screwed to the wall
next to the outlet, at 'D'. The plume now strikes an angled plate at
'B', and diverts upwards; the angle pre-determined to prevent the
plume going straight up, or damaging the soffits on my garage directly
opposite the outlet.
| / (side view)
| | (top view)
Any condensation just runs off the bottom of the gizmo at 'C' and
falls to the ground.
This arrangement deliberately doesn't interfere with the flue itself
or with the actual emission of the plume; I'm sure that to do so would
risk damage or potential danger. But it avoids having to do expensive
remedial work on the flue using approved components (and in any case
there were none suitable for my application).
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