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?

--
Andrew Gabriel
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