gna03633 wrote:

How big can this plume be?

I think you woulf have to be pretty anal to get that worried about it.
We are not talking steam train here! Probably no more dramatic that a
boiling kettle.

I am keen to get something that is energy efficent, but need something that
will fit into the 'tiny' space I have

I had a similar requirement - I wanted a decent condesing combi that
would fit the rather small space left by a tiny gloworm system boiler.
Spent a long time trawling through specs to find something small enough,
and with enough power. I eventually found the Isar I mentioned above,
was nice to install and has performed very well since. I would be
interesting to know if you find any smaller.

--
Cheers,

John.

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