As previously mentioned, for a flue to work successfully, it must be kept warm. The draw up a flue is directly related to the difference in temperature between the flue gasses and the air outside. The more efficient the appliance, the more critical this becomes. An old chimney serving an open fire where a high proportion of the heat went up the chimney may have worked satisfactorily but install a modern high efficiency stove or roomheater and serious problems could result due to the reduced flue temperature and resulting condensation. Care must be taken to ensure the new lining will give improved insulation appropriate to the type of fire to be used. Generally for solid fuel and wood burning the space around the new lining should be filled with insulating material such as Perlite or Vermiculite.

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