Using liner from my wood stove for a gas furnace

We had a wood stove in the basement that we never used. Literally, 20-30 ever and we got a new liner put in when the stove was put in.

We decided to get a gas furnace and get the wood stove removed. When we got the estimate, the furnace company told us that liner would be perfect for the furnace. Then when they were installing it, they said in a CYA-type way to get a sweeper to ok using the liner for the gas before we start using it.

I also have a pellet stove and I do my own sweeping, but because of the right angle of how the pipes connect, I couldn't get my fiberglass rod to sweep this liner. It's not very dirty because it's new and hasn't been used very much. One of the installers said "believe me I've seen a lot worse"

The comment at the end about having the liner looked at before using the gas stove made me nervous. They said to have the sweep confirm the creosote situation.

I was just looking for opinions on this. Does it sound unsafe, is there a risk of a fire in the liner from the heat generated by the gas exhaust? (the new furnace is 83% efficient).

Would that risk be any worse than using the wood stove? I assume that smoke from the wood stove (and my pellet stove) are hotter.

DAKSY said:

Many of the newer gas furnaces can utilize PVC tubing for exhaust gases.
Check your owner's manual. If PVC will work, Stainless Steel should work.

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Thanks. I think the steel will work, just should I be concerned about a small amount of creosote buildup