Gas Fireplace vs. Electric Heat: Cost Comparison

Choosing between a gas fireplace and electric heat comes down to how you use your space, your energy prices, and whether you want heat or just the look of a fire. The right call depends on room size, installation, safety, and how much you actually run the thing.

Here’s how gas and electric stack up—by the numbers, by the rules, and by the real-world hassles you’ll face getting ready for winter.

Gas Fireplace vs Electric Heat at a Glance

Where the Heat Actually Goes

A gas fireplace usually delivers several times more heat than an electric fireplace, so it can warm a larger room; electric heat sends nearly all of its input energy into the room but tops out at the capacity of the outlet. For the same delivered heat, gas often costs less in cold climates, while electric heat can win where electricity is inexpensive or the heating zone is small.

An electric fireplace is an electric resistance heater inside a decorative cabinet, often with a flame effect. At its common 1,500-watt setting, it produces about 5,100 BTU per hour (1,500 × 3.412). A standard plug-in electric heater has the same basic heat ceiling. A vent-free gas fireplace burns fuel inside the room and commonly produces roughly 20,000 to 40,000 BTU per hour, depending on the model.

Electric resistance heat is nearly 100% efficient at the plug: electricity becomes heat at the element, and that heat remains indoors. The efficiency number doesn’t make electric heat cheap by itself; the electric rate and wattage decide that. A gas fireplace loses some heat up the flue, although a listed high-efficiency vented model can retain much more than an older open-front design. Vent-free models retain nearly all combustion heat, but they also release combustion moisture indoors and require an indoor-rated unit, the ventilation specified by its manual, and a working carbon monoxide alarm.

What It Really Costs to Run

A gas fireplace usually costs less per hour to run than electric heat in a cold climate, but the answer depends on your gas rate, electric rate, fireplace efficiency, and how much heat you actually need. Installation tilts the other way: an electric fireplace is usually cheaper to install if you already have a suitable wall outlet, while a gas fireplace may need a gas line, venting, permits, and professional installation. The fuel bill is only half the receipt.

Compare Therms With Kilowatt-Hours

Natural gas is commonly billed in therms, where 1 therm equals 100,000 Btu of gas energy. Electricity is billed in kilowatt-hours, or kWh; a 1,500-watt heater uses 1.5 kWh in one hour. Check the fuel charge on both utility bills, then include delivery fees, taxes, and other charges if you’re comparing the total monthly bill rather than the marginal cost of heating.

For the same delivered heat in that example, electric resistance heat needs about 24,000 ÷ 3,412 = 7.0 kWh, costing roughly $1.19 per hour at $0.17 per kWh. Gas costs about 45 cents for that heat before fixed charges. A heat pump is a different comparison because it can deliver more heat than the electricity it consumes; don’t treat it as a 1,500-watt resistance fireplace.

Getting It In: Installation and Conversion

Converting a gas fireplace to electric means replacing the gas appliance, not changing its burner into an electric heater. A natural gas fireplace can be replaced with an electric fireplace, but the gas line must be shut off and capped correctly, and the old venting may need to be removed or left in place according to the new unit’s instructions and local code.

Installing a new gas fireplace usually costs more in labor and site work because the project may need a gas line, approved venting through a wall or roof, framing, a hearth and finish work. A new electric fireplace is usually the simpler and lower-cost installation if a suitable receptacle already exists; built-in framing, drywall and electrical changes can quickly become the expensive part.

Before scheduling work, identify whether the existing fireplace is a gas insert, a factory-built gas fireplace or a masonry fireplace with a gas log set. That label changes what can stay, what must be removed and how the replacement can be supported. The installation manual and local code get the final vote; fireplaces are unusually good at making a simple-looking box hide several trades.

Safety and the Rules You Cannot Ignore

Gas fireplaces need combustion air, a safe vent path, and a working carbon monoxide alarm; electric fireplaces avoid combustion but still need correct clearance and a sound electrical circuit. Treat the two appliances differently, because a pretty flame doesn’t change what is happening behind the glass.

A gas fireplace may need electricity for electronic ignition, a blower, lights, or remote controls. Some models with a standing pilot can produce heat during a power outage, but the exact answer comes from the rating plate and manual. Never assume a dead remote means the fireplace is safe to light by another method.

Plug electric heaters and electric fireplaces directly into a wall outlet, never an extension cord or power strip. Tip-over protection, overheat shutoff, and a UL, ETL, or CSA listing are useful checks, but they don’t excuse an overloaded circuit or blocked air intake. A 1,500 W heater already uses about 12.5 A, leaving little spare capacity on a standard 15 A, 120 V circuit.

In the UK, keep a portable electric heater at least 1 metre, roughly 3 feet, from the fireplace opening, curtains, furniture, and other combustibles unless the appliance instructions require more. Don’t put a portable heater inside an existing fireplace opening; an electric insert or log set belongs there only if that product is designed and listed for the installation.

Noise, Ambiance, and Everyday Comfort

Electric heat is usually the quieter, more controllable choice, while gas gives the more convincing flame and stronger room presence. The difference matters most during a quiet film, overnight in a bedroom, or in an open-plan room where a small fan has nowhere to hide.

A gas fireplace can make a soft burner or flame sound, then click during ignition; models with a blower add moving-air noise. Electric fireplaces may be nearly silent during flame display, but fan-forced heat produces a steady hum and can click as the thermostat cycles. Oil-filled or radiant electric heat avoids fan noise, though it doesn’t provide the same fireplace effect.

Electric fireplaces with mantels are available as complete furniture-style units, and recessed electric fireplaces suit a cleaner built-in look. Electric fireplace logs can refresh an existing opening, but they won’t behave like a gas burner or provide the same heat output. Flame-only mode is useful in mild weather, when you want the glow without adding heat.

How Long They Last and What Upkeep They Need

Gas fireplaces often serve for about 10–20 years, while electric fireplaces commonly last about 10–15 years; burners, gas valves, fans, switches, and circuit boards usually fail before the cabinet does. A well-maintained gas unit can run longer, but replacement parts eventually become the limiting factor.

What Each One Needs

Which to Choose for Your Space

For an existing fireplace, the best electric insert is a correctly sized, listed unit that fits the opening without blocking ventilation or leaving unsafe gaps. Measure the opening first, and have any gas supply disconnected by a qualified professional before converting a gas fireplace.

No single brand can honestly be named the best electric linear-fireplace brand from the available specifications; compare the exact model’s heat output, dimensions, controls, listing, and parts support instead. A linear unit suits a wide living-room feature wall, while a small electric heater fits a bedroom or office better.

Questions People Ask