A gas log lighter is a perforated gas pipe that sits under the grate to start a wood fire. It is not a gas log set, and it must never be left burning once the wood catches. Before the first fire of the season, check that the valve shuts fully, that the pipe is not rusted through, and that the flue is clean and open. Aurora homes built from the 1960s through the 1990s very often have one, and many owners have no idea it is there.
By James Rodriguez, Central Chimney Service.
What a gas log lighter actually is
It is a straight or U-shaped steel pipe drilled with small holes, running across the floor of the firebox under the grate, fed by a gas line with a key valve in the wall or floor near the hearth. Its only job is to light split wood. It is not a decorative gas log set and it is not built to run on its own for heat. Turning it on, lighting it, letting the wood catch for a few minutes and then shutting the key valve is the entire intended cycle.
The difference matters because the two systems are serviced differently. If you have a true gas log set or a sealed gas insert, that is gas fireplace service work. A log lighter lives inside a wood-burning fireplace, so it gets looked at during a regular sweep and inspection.
Five checks before the first fire
Run through these with the fireplace cold and the key valve closed.
- The key valve turns and seats. It should move without forcing and stop firmly closed. A valve that spins freely past the stop, or one that needs pliers, is finished.
- No gas smell, ever. If you smell gas near the hearth with the valve closed, do not light anything. Shut the gas off at the appliance valve and call a licensed plumber or the gas utility.
- The pipe is intact. Decades of heat and ash rot these pipes from the outside in. Flaking scale, a pipe you can flex by hand, or holes larger than the drilled ports mean it needs replacing or capping.
- The ports are clear. Ash packs into the holes. A stiff brush along the top of the pipe is usually enough. Never poke the holes larger.
- The damper is open and the flue is clean. A log lighter puts real heat and combustion gases up the flue immediately. If the chimney is blocked, that comes into the room instead.
Signs it is time to cap the line
Plenty of Aurora homeowners no longer use the lighter and would rather be rid of it. That is a reasonable choice. A licensed gas fitter can cap the line safely, and the fireplace keeps working normally on wood, kindling and a careful top-down build. Cap it if the pipe is corroded through, if the valve leaks, if the key is lost and the stem is seized, or if the line was disconnected during a remodel and never properly terminated. An abandoned open line behind drywall is a genuine hazard, not a cosmetic issue.
How this fits your annual sweep
The standard we work to, NFPA 211, sets chimney inspection at once a year for soundness, freedom from deposits and correct clearances. A log lighter check rides along with that visit. We look at the pipe, the valve, where the grate sits over it, and the firebox floor around it, then tell you plainly whether it is safe to use, worth replacing, or better capped.
Central Chimney Service has been working these chimneys for 29 years. We are insured and bonded, we give the price up front before any work starts, and what we charge is posted on our pricing page. Booking a chimney inspection before the cold sets in means you are not waiting behind everyone who discovered a problem on the first freezing night. The full list of what we handle is on our services page.
We cover Aurora and the surrounding suburbs seven days a week, 7 AM to 7 PM. Reach us at (815) 305-5510, or read more about our chimney sweep service in Aurora.
Frequently asked questions about gas log lighters
Can I leave the gas log lighter running while the fire burns?
No. It is meant to run only until the wood catches, usually three to ten minutes. Leaving it on wastes gas, overheats the pipe and shortens its life considerably.
How do I know if my fireplace has one?
Look under the grate for a steel pipe running across the firebox floor, then look for a small key valve in the wall, floor or hearth apron within a few feet of the opening. If you find the valve but no pipe, the line may have been abandoned and should be checked.
Is a log lighter the same as gas logs?
No. Gas logs are a complete burner and ceramic log set that produce the whole fire. A log lighter only starts a wood fire and must be shut off afterward.
Why will my log lighter not light?
Usually blocked ports packed with ash, a closed or partly closed key valve, or gas shut off upstream after other work in the house. If the valve is open and you still get nothing, stop and have it looked at rather than repeatedly trying to light it.
Does a log lighter need its own separate inspection?
It is covered during a normal annual chimney inspection of a wood-burning fireplace. Gas line repairs or replacement are separate work for a licensed gas fitter.
Can I replace the pipe myself?
We do not recommend it. Any work on the gas line itself, including removal and capping, belongs with a licensed gas professional. Sweeping and inspecting the fireplace around it is our side of the job.
Does having a log lighter change how often I need a sweep?
No. Sweeping frequency is driven by how much wood you burn and how much creosote builds up. The lighter does not add deposits, but it does add one more thing worth checking each year.
My key valve is missing. What now?
Replacement keys are inexpensive and widely available, but a missing key often means the line has sat unused for years. Have the pipe and valve assessed before you put a new key on it and open the gas.
Published October 19, 2026