tonyjeffs wrote:

How big & intrusive is the plume from a condensing boiler? I've never
seen one in action.
I will fit it as close as allowed to eaves level (first floor), so that
should help keep the plume at bay.

Make sure the plume isn't going to be directed towards, eg any wooden
soffits though; otherwise they'll end up being warm and damp most of the
time and will rot.

David