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Message: [QUOTE="mussels, post: 4079557, member: 5722"] My understanding is it’s absolutely critical if you have a furnace chimney that was previously using coal or oil and are now switching to natural gas. (the exhaust products, temperatures, and rates of condensation are different for the different fuels, and the old oil exhaust byproducts left on the chimney don’t play well with gas exhaust and condensation.) I have had this done (stainless steel liner) and I just considered it part of the cost of switching from oil (and a buried oil tank) to gas. If it’s always been a wood burning fireplace, and will remain a wood burning fireplace then I would think the need to reline would be largely determined by the current condition. Wouldn’t the sweep be able to advise you about the current condition and make recommendations? [/QUOTE]