John Rumm wrote:

That has to be complete nonsense when you think about it. There is
actually more water vapour present in the exhaust of a conventional
boiler than there is in that of a condenser.

The only difference is that on a conventional boiler that exhaust gas
temperature is higher, so the conversion back to visible water vapour
will occur some distance from the flue (where it is now more dispersed
and hence less visible).

Guess so. but.....
clutching at straws
the hotter gasses of conventional would and do make the gasses go up
even on the coldest days, whereas the colder gases from condensor would
be more localised and at a more inconvienient hight?

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