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Subject to change due to technical improvements
Chimney
Chimney renovation before it's too late
Compared to older boilers, modern ones are much
more efficient and have lower amounts of flue gas
with considerably lower temperatures.
Flues with "too large a cross-section" (over 18 cm)
in particular are no longer heated adequately. The
moisture contained in the exhaust gases condenses
in the flue and in this way leads to very slow but
inexorable destruction of old masonry chimneys.
Furthermore, if the diameter of the flue is too large,
the exit velocity and temperature are too low. The
flue gas then lacks the energy to rise and in extreme
cases, the smoke can sink down along the roof.
If your flue does not have a moisture-resistant
lining or its diameter is too large, it will need to be
renovated with the addition of a moisture-resistant
inner lining. Narrow flues can also be renovated
with stainless steel pipes.
Also keep in mind that chimneys have a limited
service life. Timely renovation before the chimney
wall has been destroyed can be performed quickly
and easily by inserting a tube. But if the flue gas
condensates have penetrated the mortar joints, then
the entire flue must be dismantled and rebuilt.
Sealed connection pipe to chimney
A sealed flue pipe is an absolute necessity. Joints can
be sealed with heat-resistant silicone (300 °C) and/
or pure aluminium tape to prevent the escape of
dust or flue gas.
Technical requirements for the flue
can be found in the installation instructions
(a separate document from this user manual).
Chimney