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geoff

In message ,
writes
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It will also affect the draw. I can't decide if it won't draw enough,

The draw is dependent on the buoyancy of the air in the column, if
it's cooler then less draw.

I still cannot figure why a sophisticated bit of kit like a modern gas
boiler, which is fueled by a gas that is readily combustible, has a
fan, yet a wood fire which has a low cv fuel which is difficult to
cleanly burn and would benefit from the turbulence and air control is
resisted.

It is because most boilers are room sealed, they are not drawing air in
from the room, it has to be sucked in from the outside via the outer
tube in the flue and the products of combustion pushed out down the
inner tube of the flue

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geoff