In article , Dave Plowman (News)
scribeth thus
In article ,
Bill wrote:
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
fully, surely we should see no visible exhaust.

It's water vapour - not steam.

Woss the difference then?...
--
Tony Sayer