Most gas fireplaces have a pilot light, but not all

Yes, most gas fireplaces use a pilot light — a small, continuously burning flame that ignites the main burner when you turn on the fireplace. However, some newer models skip the pilot light entirely and use electronic ignition instead. Whether your fireplace has one depends on its age, model, and how it was designed to start.

If your fireplace is more than 10 to 15 years old, it almost certainly has a pilot light. Newer models increasingly use spark ignition or hot surface igniters, which eliminate the need for a flame burning all the time. Both systems work, but they have different costs and maintenance needs.

Key Takeaways

  • Pilot lights burn continuously and use a small amount of gas to stay lit, while electronic ignition systems only use gas when you turn the fireplace on.
  • A pilot light that goes out can usually be relit by hand using the control knob on the fireplace itself, without calling a technician.
  • Electronic ignition fireplaces cost more upfront but save gas over time and have fewer parts that can fail.
  • If your pilot light won't stay lit, the thermocouple (a safety device) may need replacement, which typically costs $100 to $300 in labor and parts.

How a pilot light works in a gas fireplace

A pilot light is a small flame that stays on whether the fireplace is in use or not. When you turn on the fireplace, gas flows to the main burner, and the pilot light ignites it. The pilot flame is held in place by a thermocouple, a safety device that detects heat from the pilot and tells the gas valve to stay open. If the pilot goes out, the thermocouple cools down and shuts off the gas supply, preventing unburned gas from filling your home.

The pilot light uses roughly 400 to 600 BTU per hour, which translates to a small but measurable amount on your gas bill if the fireplace runs year-round. In winter, when you use the fireplace regularly, this cost is usually negligible. In summer, when the pilot burns but the fireplace sits unused, it adds up over three or four months.

Electronic ignition as an alternative to pilot lights

Newer gas fireplaces often use electronic ignition instead of a pilot light. These systems use a spark or a hot surface element to light the main burner only when you turn on the fireplace. Once the burner is lit, the ignition shuts off. No flame burns when the fireplace is off, so no gas is wasted.

Electronic ignition fireplaces cost $200 to $500 more at purchase than pilot light models, but they save gas over time — especially if you live in a warm climate or use the fireplace infrequently. They also have fewer moving parts and are less likely to fail. The trade-off is that they require electricity to operate, so a power outage will prevent you from using the fireplace unless you have a battery backup or manual override.

What to do if your pilot light goes out

If your pilot light is out, you can usually relight it yourself without calling a technician. Look for the control knob on the front or side of the fireplace — it typically has three positions: "Off," "Pilot," and "On." Turn the knob to "Pilot," then press and hold it while you light the pilot with a long lighter or match. Hold the knob down for 30 to 60 seconds after the pilot ignites to let the thermocouple warm up and sense the flame.

If the pilot lights but goes out again within a few minutes, the thermocouple is likely faulty and needs replacement. If the pilot won't light at all, the gas line to the pilot may be blocked, or the igniter may be dirty. In either case, a technician can diagnose and fix the problem, usually for $150 to $400 depending on what needs to be replaced.

Pilot light maintenance and common problems

Pilot lights are generally reliable, but a few issues come up regularly. Dust or debris can clog the pilot opening, preventing ignition. A weak or yellow flame (instead of blue) can mean the pilot needs cleaning or the gas mixture needs adjustment. Drafts from windows or doors can blow out the pilot, especially in older fireplaces with less stable designs.

The thermocouple is the most common failure point. It typically lasts 5 to 10 years before it becomes too sensitive or loses its ability to hold the gas valve open. When it fails, the pilot light may light but won't stay lit, or the main burner won't ignite even though the pilot is burning. Replacement is straightforward and usually costs $100 to $300 in parts and labor.

Comparing pilot light and electronic ignition costs over time

A pilot light fireplace costs less upfront but burns gas continuously. Over a year, a pilot light uses about 4 to 7 therms of gas (depending on how long it runs), which costs roughly $20 to $50 at typical gas rates. An electronic ignition fireplace uses zero gas when off, so you pay only for the hours you actually use it.

If you use your fireplace heavily in winter, the difference is small. If you use it rarely or live in a mild climate, electronic ignition pays for itself in 5 to 10 years. Electricity for the ignition system costs almost nothing — typically less than $1 per year.

Safety features tied to the pilot light

The thermocouple is a safety device, not just a convenience. If the pilot goes out, the thermocouple stops sending a signal to the gas valve, which closes automatically. This prevents gas from flowing into your home if the pilot flame is extinguished by a draft, a gust of wind, or a mechanical failure. Without this safety mechanism, unburned gas could accumulate and create a hazard.

Electronic ignition systems have their own safety features: they won't ignite the burner if the spark or hot surface element isn't working, and they shut off gas if the flame doesn't light within a few seconds. Both designs are safe when working properly, but a faulty thermocouple or a broken igniter should be repaired promptly.

Frequently Asked Questions

Can I convert a pilot light fireplace to electronic ignition?

Yes, but it is usually not worth the cost. A conversion kit can run $300 to $600 in parts alone, plus installation labor. For that price, you could replace the entire fireplace with a new electronic model. If your current fireplace is otherwise in good condition and you want to save gas, replacing just the thermocouple or cleaning the pilot is a cheaper first step.

Does a pilot light use a lot of gas?

No, a pilot light uses very little gas — roughly the same as a small burner on a kitchen stove left on low. Over a year, it adds $20 to $50 to your gas bill, depending on local rates and how long the fireplace runs. If you use the fireplace only in winter, the cost is negligible.

Why does my pilot light keep going out?

The most common cause is a faulty thermocouple, which should be replaced. Other causes include a clogged pilot opening (clean it with a thin wire or compressed air), drafts from nearby windows or doors, or a gas pressure problem. If relighting the pilot doesn't solve it, have a technician inspect the thermocouple and gas line.

Do I need to turn off the pilot light in summer?

You can turn it off to save gas, but it is not necessary. Most people leave it on for convenience — relighting it in fall takes only a minute. If you want to save the small amount of gas it uses, turn the control knob to "Off" and leave it there until you use the fireplace again.

What happens if the pilot light goes out during use?

The main burner will shut off because the thermocouple will no longer signal the gas valve to stay open. The fireplace will stop producing heat and flame. This is a safety feature. Relight the pilot using the control knob, then turn the fireplace back on.