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wrote:

I need to get a new boiler installed. I will be getting a condensing
combi boiler and I want to relocate it to the cellar. The problem I
have is getting the flue out. The best place would mean the flue
exiting the cellar less than 300mm from the ground which is,
apparently, against the regs. Is it possible\allowed to have the flue
exit the house close to the ground but then have a 90 degree elbow to
take the flue and air intake up the wall to an acceptable height -
perhaps even to the eaves?

I have looked at the Vaillant ecoTec boiler flue options and they
appear to have these elbow fittings and extension tubes.

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.

--
"The moral majority is neither."