"Andrew Gabriel" wrote in message
...
In article ,
(Peter) writes:
Hello,

I am having a Vaillant 622/2E System boiler installed in my house
for central heating and hot water.

Because of the way our house sits on a hill any plume from the flue
outlet would be comming out just to the left and below the main
house door entrance and also quite near a hall window.
i.e. any plume would be very visible.

Can anyone tell me how much plume I should expect to see ?

I think it might depend on the boiler and flue. My Keston
doesn't produce anywhere near as much as I thought it might,
actually, probably not a lot more than next door's conventional
boiler.

That is because it is a top mounted burner with a bottom flue. The
condensate trap is taken off the lowest point of the flue. This mean that
less moisture is in the flue gasses as it exhausts. Have a Keston with the
maximum flue length of 40 or 50 metres, or whatever, and virtually no plume
is visible, if at all.

I have a bottom mounted burner and top mounted flue. The flues gas are full
of moisture when exhausting giving a thick plume.

In the early days of condensing boilers the top mounted flue jobs didn't
produce much condensate in the drain pipe, with plumbers saying "condensing
boilers don't work", "the makers have played around with the burnmers to
make that plume", "not worth the money", etc. The test efficiencies tended
to right over their gutter fitting heads.

Would there be a plume in summer ?

My top monted flue does plume in summer.




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