How long lasting is a new flue liner?

This varies with amount of use, the way the appliance is operated and the type and quality of fuel used.  We suggest that where the fuel burnt is largely or exclusively fossil fuels then the higher quality 904 steel is used. This has better resistance to the acids associated with burning coal. For most appliances a Class 1 316 stainless steel liner is entirely acceptable. In general, liners made of stainless steel usually last somewhere between 15 to 25 years (though some low quality liners might not even last for five).

Preferable to both these is the pumice system which has excellent longevity and durability together with the insulation value that exceeds that of the flexible liners.

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