Convert Oil Furnace Flue to Wood Stove Flue

[Turbo89]

I’ve been planning to switch my heating system from my existing oil furnace to mini-splits or natural gas with a basement wood stove for a while. While looking into this, I found that I can power vent my existing oil furnace now, freeing up the existing flue.

While looking at my existing oil furnace setup, it looks like the previous owner spent some money. It looks like double wall pipe going into a lined mason art chimney.

Is there a way to tell if this liner is compliant with UL1777 and suitable for a wood stove as is? My understanding is that oil flue pipe is required to be stainless, so I’m trying to understand if I’d need to re-line for a wood stove.

 

[begreen]

Get a certified sweep to inspect and determine the type of liner and clearances of the flue system.

 

[Turbo89]

Thx, I’ll probably go that way when I convert it, but I’m a pretty handy, so just looking for something obvious / easy to check even up on a ladder looking down before I spend the money.

I know code says there’s supposed to be a permanent affixed label plate.. but I don’t see it, and I assume it’s one of those written rules that’s not typically enforced.

 

[begreen]

Oil burner liners are not typically insulated because there's no creosote risk and the exhaust is cooler than the potential from a wood stove. If the liner is not insulated, then check for the chimney clearances from any combustibles. If it's an interior chimney, it needs 2" all the way up. If exterior, then 1" clearance is required.

 

[brenndatomu]

If the liner is good enough to be reused, and can be pulled out, it could be wrapped with 1/2" liner insulation and put back in...

 

[Turbo89]

If the liner is good enough to be reused, and can be pulled out, it could be wrapped with 1/2" liner insulation and put back in...

That’s an interesting idea, as far as I can tell
the liner is less than 10yrs or so old. I’ll have to dig the ladder out over the weekend and look down the chimney to see what I can see.

 

[begreen]

This will depend on the clay tile ID. Measure it when doing the topside inspection. Our furnace chimney had 8x8 tiles which is not enough wiggle room for an insulated liner. If so, it may take a 5.5" liner to accomodated insulation.