Infrared Fireplace Insert: Complete Guide for Homeowners

Most masonry fireplaces send more heat up the chimney than they ever push into the room, which is why so many homeowners end up with a beautiful brick opening they rarely use. An infrared fireplace insert fixes that problem without gas lines, venting, or ash cleanup. It slides into the existing firebox, plugs into a standard outlet, and warms people and furniture directly instead of just the air near the ceiling. If you want a working focal point back in your living room for a few hundred dollars, this is one of the most practical routes available.

What Is an Infrared Fireplace Insert?

An infrared fireplace insert is an electric heating unit built to fit inside an existing wood-burning fireplace opening. It combines a flame-effect display (usually LED-lit, sometimes with a mist or reflective panel for depth) with a heating element that emits infrared energy. A surround or trim kit covers the gap between the insert and the masonry, so the finished result looks built-in rather than like a space heater parked on the hearth.

Unlike a wood or gas insert, nothing burns. There is no combustion, no flue gas, and no carbon monoxide produced by the unit itself. The flame effect runs with or without heat, which means you can enjoy the look in July and the warmth in January. Most models draw power from a regular 120-volt household circuit and top out at about 1,500 watts, which works out to roughly 5,100 BTU per hour of output.

How infrared heat differs from forced-air heat

Conventional electric fireplaces push a fan across a hot coil and blow warm air into the room. Infrared units work more like sunlight: the element emits radiant energy that is absorbed by the surfaces and people in its path. Those surfaces then release warmth back into the room. The practical difference is that you feel warm faster when sitting in front of the insert, and the air tends to stay less dry. Many infrared inserts also include a quiet blower to spread heat further, so the best units combine both approaches.

Benefits and Limitations Worth Knowing

Before buying, it helps to be honest about what these inserts can and cannot do. They are excellent supplemental heaters, not whole-house furnaces.

• Zone heating: A 1,500-watt unit comfortably heats a room of about 400 to 1,000 sq ft, depending on ceiling height, insulation, and climate. That lets you turn the central thermostat down a few degrees and warm only the room you are using.
• No venting or permits for gas: Because there is no combustion, you avoid chimney liners, gas line work, and annual sweeping tied to the insert itself.
• Low maintenance: Occasional dusting of the glass and intake grilles, plus replacing LED bulbs or the heater element after many years, covers most upkeep.
• Safety profile: Glass fronts stay cool enough to touch on most models, which is a real advantage with kids and pets.

Now the limits. Output is capped by the circuit, so an infrared insert will never match the 20,000 to 40,000 BTU of a wood or gas insert. In a drafty room with high ceilings, you may notice it only warms the seating area. And if your chimney is left open, warm room air can still escape up the flue, eating into the efficiency you paid for. Plan to deal with the damper and chimney opening as part of the job.

Sizing an Infrared Fireplace Insert to Your Firebox

Getting the size right is the most common place homeowners stumble. Inserts are sold by the dimensions of the unit itself and the surround that covers the opening, and both matter.

1. Measure the front opening: Record the width at the top and bottom and the height on both sides. Masonry is rarely square, so use the smallest numbers.
2. Measure the rear width: Most fireboxes taper toward the back. The insert body must clear the narrowest point.
3. Measure the depth: Go from the face of the opening to the back wall at several heights. Many inserts need 12 to 16 inches of depth, though slim models exist.
4. Check the surround coverage: The trim kit should overlap the opening by at least 1 inch on each side so gaps stay hidden.

Common insert sizes run from about 23 to 33 inches wide for the visible firebox, with surrounds reaching 30 to 45 inches wide. If your opening is unusually shallow, look for “slim profile” units and confirm the manufacturer’s minimum depth before ordering. A unit that is too large simply will not go in, and one that is too small leaves an awkward gap that even a surround cannot fully disguise.

What an Infrared Fireplace Insert Costs

Pricing depends on size, flame realism, and features like remote control, app connectivity, and adjustable flame colors. Here is a realistic range for US homeowners.

Operating cost is easy to calculate. At 1,500 watts on high and an average electricity rate near $0.17 per kWh, you will spend about $0.25 per hour of full heat. Run it four hours a night and you are looking at roughly $1 per day. The flame effect alone typically uses under 50 watts, costing pennies.

Installation Step by Step

Most homeowners can install a plug-in unit in an afternoon. Start by having the chimney swept and inspected if you burned wood there recently; soot and creosote are not something you want sealed behind a new insert.

1. Clean the firebox: Remove the grate, ash, and loose debris. Vacuum the floor of the firebox with a shop vac rated for fine dust.
2. Close or seal the damper: Close the damper fully. If it does not seal well, install a chimney balloon or a top-sealing damper to stop drafts.
3. Plan the power route: Many inserts run a cord out the side of the opening. Hiding it behind the surround or feeding it to an outlet installed inside the firebox by an electrician gives a cleaner look.
4. Attach the surround: Fasten the trim kit to the insert per the instructions before sliding it into place.
5. Slide in and level: Push the unit in, check that it sits level, and use the leveling feet or shims if the hearth slopes.
6. Test all functions: Run flame-only mode, then heat on low and high, and confirm the thermostat and overheat protection respond.

When to call a licensed professional

Plug the insert directly into a wall outlet, never an extension cord or power strip. A 1,500-watt heater draws about 12.5 amps, so ideally it should be on a dedicated 15- or 20-amp circuit. If the outlet is shared with other heavy loads, if breakers trip, if you want an outlet installed inside the firebox, or if you want to hardwire a larger 240-volt unit, hire a licensed electrician. Also have a certified chimney professional inspect a fireplace that has signs of cracked firebrick, loose mortar, or water staining before you cover it. An insert hides problems; it does not fix them.

Choosing Features That Matter

With dozens of models on the market, focus on features you will use every day rather than marketing extras.

• Built-in thermostat: Lets the unit cycle to hold a set temperature rather than running flat out.
• Overheat protection and tip sensors: Look for a UL or ETL listing, which confirms the unit was tested to a recognized safety standard.
• Adjustable flame brightness and color: Dimmer flames look more realistic at night.
• Timer: An 8- or 9-hour auto-off is useful for evening use.
• Noise level: Check reviews for fan noise if the insert sits in a quiet den or bedroom.
• Warranty: One to two years is typical; longer coverage suggests confidence in the heater element.

Pay attention to the media inside the firebox too. Realistic resin logs, crushed glass, or river rock can change the look dramatically. Some units let you swap media, which keeps the display fresh as your decor changes.

Infrared Insert vs. Gas and Wood Inserts

If you are weighing options, compare on heat output, installed cost, and upkeep. A wood insert delivers the most heat and works during outages, but costs $3,000 to $6,000 installed with a stainless liner and requires annual sweeping. A gas insert typically runs $3,500 to $7,500 installed, needs a gas line and venting, and produces strong heat with minimal effort. By contrast, an infrared fireplace insert usually costs under $1,500 all in, needs no venting, and has near-zero maintenance, but it offers far less output and depends on grid power.

For renters, condo owners with restrictions on combustion appliances, or anyone who simply wants ambience plus spot heating, electric infrared is often the best value. For a primary heat source in a cold climate, gas or wood still make more sense.

Finishing the Look Around the Hearth

An insert looks best when the surrounding materials are refreshed along with it. Old, stained brick can be limewashed or painted with high-heat-rated masonry paint. A tired hearth can be refaced with porcelain tile, slate, or a single stone slab. Because an electric unit produces no open flame, you have more freedom with materials than you would with a wood-burning setup, though the manufacturer’s clearance guidance to mantels and trim still applies. Many homeowners also add a floating mantel shelf 12 to 18 inches above the surround to frame the new insert.

If the fireplace sits in a room with hardwood or LVP flooring, protect the transition with a flush hearth extension or a threshold strip. It keeps the floor edge clean and gives the whole installation a finished, intentional feel.