Converting a Wood Fireplace to Gas: What's Actually Involved
A wood-to-gas conversion is more than dropping in a log set — and the liner is the part most people miss. Here's the real scope of the job, and why one crew handling the gas, the liner, and the cap together is what keeps it from becoming a future repair.
Converting a wood-burning fireplace to gas is one of the most popular hearth upgrades — no more hauling wood, no ash, instant fire — and on the surface it looks simple: add a gas line and a log set. The part that gets missed, and the part that determines whether the conversion is safe and efficient, is the chimney. A flue sized for a wood fire is usually wrong for a gas appliance, and getting the venting right is most of the real job. That's the case for one crew: the team running the gas and setting the appliance is the same team sizing the new liner, so the appliance and its venting are designed together instead of bolted on by separate hands.
01The gas supply and the appliance
The visible part of the conversion is running a gas line to the fireplace and installing the appliance — typically a gas log set, or a sealed gas insert for far better efficiency. The log set gives you the wood-fire look; an insert is a closed, efficient unit that actually heats the room. Either way the gas line, shutoff, valve, and ignition have to be installed and pressure-tested correctly, because this is a gas appliance and the connections are a safety matter, not a convenience one. Keeping that work with the same crew that handles the flue means nothing gets split across trades that each assume the other checked the venting.
02Why the liner usually has to change
Here's the step most homeowners don't anticipate: a masonry flue sized for a wood fire is too large for a gas appliance, and that mismatch causes poor venting and condensation that corrodes the chimney from the inside out. A correctly-downsized stainless gas liner vents the new appliance safely and to code. Sizing it right to the specific appliance is the whole job — skip it or guess it, and you've built in a venting and corrosion problem that surfaces later as an expensive repair. The crew that selected your appliance is the one positioned to size the liner to it exactly, which is the entire reason to keep both halves of the conversion under one roof.
03The cap and the finished details
A conversion also touches the top of the chimney: the cap and termination have to suit the new liner and appliance, and the damper may need a clamp or modification so a vented set drafts correctly. Done properly, the result is a fireplace that lights at the flip of a switch, vents safely through a correctly-sized liner, and keeps the look you wanted — every gas connection tested and the chimney verified for its new fuel. When one crew owns the gas line, the liner, the cap, and the damper, every piece of that chain is checked by the team that installed the rest, not handed off and hoped for.
A wood-to-gas conversion is a gas-appliance install plus a chimney job, and the chimney job — a correctly-downsized stainless liner — is what makes it safe and efficient rather than a future corrosion problem. Budget and plan for the liner, not just the log set, and have the gas connections properly tested. Done right by a single crew that handles the gas, the liner, and the cap as one project, you trade firewood for a switch without trading away a safe, well-vented flue.
Every recommendation here starts from one place: a graded, photographed chimney inspection — and when it's warranted, a chimney liner done to one standard, with a paper trail you keep.
The Texas Service Experts Team
This article was written and reviewed by the CSIA-certified crew at Texas Service Experts. Every recommendation reflects NFPA 211 and CSIA trade standards and the same documented, photographed approach we hold every job to.
Talk to our team