In article , John
scribeth thus

"Bill" wrote in message
...
In message , Andrew Gabriel
writes
In article ,
Bill writes:
There is, of course the ancillary question about why, if it's a
condensing boiler, we see so much 'steam' from it. If it were condensing

You can't see any steam from it - steam is invisible.
You see the water droplets as a result of condensing the steam.

fully, surely we should see no visible exhaust. Are we losing huge
amounts of latent heat here? Is a second stage condensing process worth
looking into?

That's why I put 'steam' in single quotes. What I was thinking was that
there might be more real steam in the output than there should be, and
that this steam was condensing into what I see after it left the flue.

What comes out does feel quite hot, so I'd have thought that a further
heat exchanger stage might be worthwhile. If the condensing boiler were
not condensing every bit of steam, this could also capture the residual
latent heat. Are there such things as add-on heat exchangers or would this
have to be a bodge it and see winter project?
--
Bill

Some boilers have optional kist to manage the plume

"Easy to fit solution for the problem of plume providing increased siting
flexibility during installation
Plume is a vapour trail that is seen coming from the front, back or sides of
a house when the flue gas temperature drops below dew point. Plume is not
harmful but can be viewed as unsightly and a potential nuisance
if it drifts
across neighbours properties or public areas.

Why is it a potential nuisance?..

Just how much of a plume do some of these old boilers make?..


This is why Glow-worm provides
the Plume Management Kit. "



--
Tony Sayer