New boiler flue location

The reason you can't have it exiting so low is because of the possibility of blockage (snow drifts, stuff falling across it etc) - I can't see any problem with using the elbows etc to get the desired height, it's what the pieces are made for!

just ensure that cellar is not airtight as the burner has to breathe air in.

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I think the Vaillant ecoTechs are all balanced flue - though I may be wrong.

I doubt that you can get any modern condensing boilers that are not also room sealed (i.e. balanced flue).

No problem. In fact, it is often only possible with a condensing boiler, as the flue operates at such a low temperature.

You may have trouble getting rid of the condensate in a cellar installation. Consider a condensate pump, such as a Sanicondens, to pump it away to the drain. Do not accept the condensate just dripping onto the ground, like most cowboy installers would have you believe is acceptable.

Christian.

Hi

Thanks Christian

I have a drain in the cellar so that sholdn't be too much of a problem.

Mike

Christian McArdle wrote:

Hi

thank you all for your help.

Cheers

Mike

John Rumm wrote:

It's the location of the flue "terminal" that's governed, not the tubes leading to it, as I read the regs. I also have a boiler in the cellar, which exits via a 45 degree bend and through the external wall before turning vertical again - it has an extension which takes it to about 6' off the ground which although perhaps not strictly necessary does at least mean it is well out of the way. I would imagine 45 degree bends are better for gas flow, and it gets around the problem of the cellar ceiling being too near ground level to go straight out.

You may well find that the flue piping is in fact fairly standard and you are not constrained to what a particular manufacturer sells. A joint clamp on the inner pipe of my flue failed and I was informed it was a "standard 2" pipe", or something. Naturally, you cannot just buy a standard 2" pipe clamp, so I fabricated one of my own.