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Boiler information
Ignition :
Piezzo igniters use the spark produced by a quartz when it is hit.
They are often used in boilers to ignite a permanent pilot flame which
will ignite the main burner on heat request. A thermo-element is used
for flame supervision of the pilot flame.
Modern high efficiency boilers are often equipped with an electric
or electronic spark ignition and flame supervision system without
permanent pilot flame.

Source: AFG
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