Hi, I've just bought a Vaillant Condensing combination boiler which
I'm going to install in my loft. I've got a vertical flu to go through
the ceiling, but the combi is to be mounted on the chimney breast in
the loft so the flu will come up next to the stack, only about 250mm
away from it.
In the instructions is says that the flu should be 500mm from a
parallel wall (put doesn't say anything about a chimney). Does anyone
know if this distance is to do with the operation of the flu or just
because the fumes may discolour the wall, in which case it doesn't
Also, do I need to fit a trap to the 19mm condensate drain before it
connects to the sink waste in the bathroom?
Any assitance would be appreciated.
I would say it doesn't mater at all, but contact Vaillant to be sure. If
the stack is not being used, then why not divert the boilers flue into the
stack and terminate the boilers flue at stack height. Then no roof tiles to
take up. Then the condensing plume would be very effective to look at.
No. The boiler takes care of this.
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Roof venting for condensing boilers seems to be the method of choice
in Germany, both for apartments and houses. I have not often seen
much of a plume, though. Perhaps that's because the length of the
flue results in the water vapour settling and running down and back
into the boiler. With cold air being drawn down the outer section,
there will be a chilling effect to the walls of the inner one.....
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