Built-In Electric Fireboxes

A built-in electric firebox is engineered to be permanently framed into a wall, delivering the look of a true fireplace without venting, gas lines, or combustion clearances to engineer around.

Built-in electric fireboxes plug into a standard 120 volt or dedicated 240 volt circuit and produce 4,000 to 9,000 BTUs of supplemental heat, enough to take the chill off 300 to 600 square feet. The flame runs independently of the heat, so they can operate year round. Every unit Fireplace Insider sells ships free nationwide with white glove delivery, and is backed by our 20 plus years of hearth industry experience and price match guarantee.

We carry built-in electric fireboxes from Dimplex, Amantii, Modern Flames, Napoleon, SimpliFire, and British Fires in widths from 26 to 100 inches. For retrofit upgrades to an existing wood firebox, see our Electric Inserts collection, or browse Linear Electric Fireplaces for wide format options.

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How to Choose the Right Built-In Electric Firebox

Six factors that determine which built-in electric will look and perform best in your wall.

Match width to your wall opening

Built-in electric fireboxes are sized by exterior width, typically in 4 to 6 inch increments from 26 to 100 inches. The rough opening must match the unit's framing dimensions exactly, with required clearances above and beside the firebox for ventilation. Always frame to the install manual, not to the nominal product width.

Confirm your power supply

Most built-in electric fireboxes use a standard 120 volt 15 amp circuit and plug into an outlet inside the framing cavity. Larger units above 60 inches often require a dedicated 240 volt 20 amp circuit for full heat output. Verify the electrical requirement before framing so the electrician can rough in the correct circuit.

Choose the flame technology

LED projection flames are the industry standard with the widest brand selection and lowest cost. Holographic dual layer flames from Modern Flames and Amantii produce depth and randomness that read as more realistic. British Fires uses a hybrid water vapor effect on premium models. Match the technology to your viewing distance and budget.

Pick the front glass and ember bed

Most built-in electrics offer flush face or tray style fronts with options for clear glass, smoked glass, or no glass. The ember bed beneath the flame may be crushed glass, river rock, log set, or driftwood. Many models include multiple bed media in the box so you can change the look. Consider how it will read at the dominant seating angle.

Plan for clearance and finish materials

Built-in electric fireboxes are zero clearance to combustibles on the sides and back, but most require 8 to 12 inches of clearance above the firebox to a combustible mantel, with no clearance to non combustible tile or stone. A TV can typically be mounted directly above on an interior wall as long as it sits above the manufacturer's published heat plume zone.

Confirm the control system

Every built-in electric ships with a remote control. Premium models add WiFi connectivity, smartphone apps, voice control through Alexa or Google Home, and timer or thermostatic modes. If the unit will be mounted high or behind a TV, app control matters because the IR remote may have line of sight issues.

Built-In Electric Firebox Questions

The questions our hearth specialists answer most often before a customer places an order.

What is the difference between a built-in firebox and an electric insert?

A built-in electric firebox is a complete framed unit designed for new construction in a stud wall. An electric insert is sized to drop into an existing masonry or factory built fireplace opening and use the existing surround. Built-in fireboxes offer wider sizes and a flush face. Inserts are easier retrofits.

Can I run a built-in electric flame without the heat?

Yes. Every modern built-in electric firebox has separate controls for the flame display and the heater. The flame uses 20 to 100 watts of LED power. The heater uses 750 to 1,500 watts only when activated. This makes electric fireplaces practical year round for ambiance only.

How much heat does a built-in electric firebox produce?

Standard 120 volt models produce roughly 4,400 to 5,100 BTUs, enough to supplement heat in a 300 to 400 square foot room. 240 volt models double output to roughly 8,500 to 9,000 BTUs and can warm 500 to 600 square feet. Electric fireplaces are designed as supplemental heat, not as primary heat sources.

Can I mount a TV above a built-in electric fireplace?

In most cases yes. Electric fireboxes vent warm air through a front or top grille at temperatures below 130 degrees Fahrenheit, well below the level that damages a TV. Verify the heat outlet location in the spec sheet and follow the manufacturer's recommended minimum mounting height, usually 6 to 12 inches above the firebox top.

How long do built-in electric fireboxes last?

A quality built-in electric firebox lasts 15 to 25 years. LED modules typically rate 50,000 hours of life, which is more than 20 years at four hours per day. The heating element is the most common replacement part and can usually be serviced without removing the unit. Premium brands offer 3 to 7 year warranties.

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Curated by the Fireplace Insider hearth team

Fireplace Insider is operated by hearth specialists with more than two decades of fireplace installation experience and thousands of completed projects. Every built-in electric firebox in this category has been vetted by an NFI certified specialist for flame realism, build quality, and clearance specifications.

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