Linear Electric Fireplace Guide: Lengths, Install and Heat

A linear electric fireplace is the wide, low-profile style that turns a plain wall into a focal point: a long horizontal band of flame, usually 40 to 100 inches across, set into a framed wall or hung on the surface. The look is modern and clean, but the length that makes it attractive also makes planning more involved than with a compact insert. Bigger glass means more weight, wider framing, and in many cases a heater that needs more power than a standard outlet provides.

Here is the quick version. Pick a length that fills about one-half of the feature wall, decide early if you want it recessed into a framed bump-out or surface mounted, and check whether the model runs on a standard 120-volt plug or needs a 240-volt hardwired circuit. Then plan the TV clearance before any framing goes up. Those four decisions shape every other step.

What Makes a Linear Electric Fireplace Different

Traditional electric fireplaces mimic a log firebox: tall, roughly square openings with a log set. A linear electric fireplace stretches the flame horizontally and usually replaces logs with a bed of crystals, river rock or driftwood media. Many models let you change flame color, ember color and brightness independently, so the unit can run as accent lighting most of the year and as a heater in winter.

Owners sometimes search for a long electric fire or long electric fireplace and land on the same product category. The names vary, but the defining traits stay consistent: a width-to-height ratio of 3:1 or more, a slim depth of roughly 5 to 9 inches, and a heater that blows from a slot along the top or bottom edge.

Common Lengths

• 40 to 50 inches: bedrooms, offices and narrow walls under 10 feet.
• 60 to 72 inches: the most popular range for living rooms with 12 to 16 foot walls and 65 to 75 inch TVs.
• 80 to 100 inches: great rooms, open-plan spaces and long media walls. These are often 240-volt units and almost always need two people (sometimes three) to set.

Recessed Versus Wall Mount

Most linear models are designed to install recessed, set into a framed opening so the glass sits flush or nearly flush with the finished wall. Some also include a bracket for a surface mount electric fireplace installation. Each approach has clear tradeoffs.

Recessed (built-in): This is the look most people want. Because standard 2×4 walls offer only about 3.5 inches of depth, you will usually frame a bump-out, a false wall that projects 8 to 16 inches into the room. The bump-out creates depth for the unit, a chase for wiring, and a flat surface for tile, stone veneer, shiplap or drywall finishes. It is more work but delivers a custom result.

Surface mount: The unit hangs on a bracket fastened to the studs, with its full depth projecting into the room. It is faster, cheaper and reversible, which suits renters or anyone not ready to commit to construction. The tradeoff is a visible side profile and a cord that must reach an outlet without a cover.

120V Versus 240V Models

Most linear units 60 inches and under run on a 120-volt, 1,500-watt heater that produces about 5,000 BTU. That is enough to take the chill off roughly 400 square feet. Many 72 to 100 inch models offer, or require, a 240-volt heater in the 2,500 to 3,000 watt range, which brings output to roughly 8,500 to 10,000 BTU for larger spaces.

The power choice affects installation:

• 120-volt plug-in: plugs into a standard outlet. Most makers recommend a dedicated 15 or 20 amp circuit, since the heater pulls about 12.5 amps continuously.
• 120-volt hardwired: connects to a junction box inside the framing. Cleaner, but it is permanent wiring.
• 240-volt hardwired: needs a new dedicated double-pole circuit from the panel. This is licensed-electrician work with a permit in most areas.

Some models are field-convertible between 120 and 240 volts. If you think you may want more heat later, buying a convertible unit and having the electrician run 240-volt-ready wiring during framing saves money compared with reopening the wall.

Planning TV Clearance

Linear fireplaces and wall-mounted TVs are a natural pairing, but heat rises. Check the manual for the minimum distance between the top of the unit and any TV, mantel or combustible shelf. Front-vented and bottom-vented models typically allow a TV closer than top-vented ones, sometimes as little as 6 to 12 inches. A floating mantel or a deep shelf between the two can also deflect warm air away from the screen.

Keep viewing comfort in mind as well. Stacking a fireplace and a 75-inch TV on one wall can push the screen center to 60 inches or higher. Sitting 10 to 12 feet back makes that tolerable, while sitting 7 feet back strains necks. A lower fireplace position, with the bottom edge 18 to 24 inches off the floor, helps keep the TV lower.

Tools and Materials for a Bump-Out Install

• 2×4 or 2×6 lumber, construction screws or nails, and a framing square
• Stud finder, 4-foot and 6-foot levels, chalk line
• Circular saw or miter saw, drill/driver
• Drywall or cement board, screws, joint compound, tape and paint, or tile/stone veneer
• Non-contact voltage tester
• Junction box or recessed outlet in the framing, installed by an electrician
• Helpers for lifting long units

Step-by-Step Framing and Installation

1. Confirm the unit’s rough-in dimensions. Download the installation manual before you buy lumber. The framed opening must match the manufacturer’s width, height and depth exactly, and some units require a specific gap at the top for heat.
2. Lay out the bump-out. Snap chalk lines on the floor and ceiling. Fasten top and bottom plates into the floor and ceiling joists, then add studs at 16 inches on center. Frame a header and sill to create the fireplace opening at your chosen height.
3. Plan the power. Before closing any walls, have the electrician run the circuit and set the box in the location the manual specifies, usually inside the opening or just beside it. Turn off the breaker and confirm power is off with a non-contact voltage tester before anyone handles conductors, and never work on wiring that is still powered.
4. Sheath the framing. Hang drywall or cement board, leaving the opening clean and square. If you plan tile or stone, cement board around the opening handles the weight and any heat better.
5. Set the unit. Make the electrical connection per the manual, slide the unit into the opening, and fasten it through the mounting flanges into the framing.
6. Finish the surround. Tape, mud and paint, or install your tile or veneer up to the trim edge. Keep finishes outside the clearance zone the manufacturer lists.
7. Test. Run flame effects first, then each heater setting. Confirm warm air exits without hitting a shelf or TV directly.

Troubleshooting

• Unit will not fit the opening: framing was built to a guessed size. Always frame from the published rough-in drawing and add 1/8 inch tolerance only where the manual allows.
• Breaker trips on high heat: the circuit is shared or undersized. A dedicated circuit fixes it.
• TV feels warm on its underside: add a mantel or deflector, switch heat off when watching, or raise the TV within comfortable viewing range.
• Uneven flame color across the length: usually one LED segment is out or a connector loosened in shipping. Check the connections in the manual before calling for warranty service.
• Glass looks hazy: wipe with a soft cloth and a mild glass cleaner when the unit is off and cool. Never spray cleaner directly into the vent slot.

Cost Ranges

Linear units range from a few hundred dollars for basic 40 to 50 inch models to well over $2,000 for 80 to 100 inch premium units. A surface mount by a handyman is typically a modest labor charge. A framed bump-out with drywall finish often adds roughly $1,000 to $3,000 in labor and materials, and tile or stone veneer surrounds push that higher. A new 240-volt circuit is commonly a few hundred dollars or more depending on the distance to the panel and panel capacity.

When to Call a Licensed Professional

Any new circuit, any hardwired connection and any 240-volt installation should go to a licensed electrician, with permits pulled as your building department requires. A general contractor or carpenter is a good call for bump-outs that run floor to ceiling, tie into ceiling joists you cannot locate, or involve heavy stone veneer. If your panel lacks space for a new breaker, the electrician may need to evaluate a subpanel or panel upgrade before the fireplace goes in.