IME, never. Not a bad idea to have chimney inspected every x years to
that the liner, joints, etc. are in good condition; some of this you
The furnace is another story. For efficient operation, annual cleaning
and tune-up are, in the opinion of many, mandatory.
Having worked at an institution with a dozen oil-burners, which were
serviced annually, I can tell you that the flues never required
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