Electric Fireplace Inserts

An electric fireplace insert slides into an existing masonry or wood-burning fireplace opening, replacing the firebox without any construction work. It's the fastest path to converting an old wood fireplace to electric, since you're using the opening you already have instead of framing something new.

If you're not working with an existing opening, our Built-in Electric Fireplaces are designed for new framing instead. For surface-mounted units that skip recessing entirely, see our Wall-Mounted Electric Fireplaces.

Sierra Flame, Amantii, Modern Flames, SimpliFire, and Dimplex all build inserts sized for standard fireplace openings, from compact 26" units to wider format pieces. Depth and mounting style are what to check against your existing opening before choosing a model.

Key Advantages of Our Electric Fireplace Inserts

Fits Existing Openings: Designed to slide into a standard masonry or wood-burning firebox without demolition.
No Venting or Gas Line Required: Plug-in or hardwire installation with no chimney work needed.
Fast Conversion: Swapping a wood-burning firebox for an insert is typically a same-day install.

Explore Related Electric Fireplace Types

Quick Product Comparison

Product Name	Install Type	Heat Output	Size	Brand
Sierra Flame 30" Flush Mount Insert	Insert, 8.5" depth	3,000-4,999 BTU, heats 400-500 sq. ft.	30"	Sierra Flame
Amantii Traditional Insert	Insert, flush mount	3,000-4,999 BTU, heats up to 900 sq. ft.	40"-49"	Amantii
Modern Flames Redstone 30"	Insert, flush mount	5,000 BTU, heats 400-500 sq. ft.	30"	Modern Flames
SimpliFire Traditional Insert	Insert, plug-in	5,000-6,999 BTU, heats 400-500 sq. ft.	Under 40"	SimpliFire
Dimplex Nova XHD	Insert, plug-in	5,118 BTU, heats up to 1,000 sq. ft.	Under 40"	Dimplex

Broader Hearth Collections

Why Choose Electric Fireplace Inserts from The Fireplace USA?

Manufacturer-authorized inventory from Sierra Flame, Amantii, Modern Flames, SimpliFire, and Dimplex
Genuine manufacturer warranties on every unit
Direct support from our team on sizing, install type, and model selection

Frequently Asked Questions

Will an insert fit my existing wood-burning fireplace?

Most inserts are sized for standard masonry openings, but you'll need to measure your firebox's width, height, and depth against the product's installation spec before ordering. There's no universal size, so check the dimensions carefully.

Do I need to remove my existing chimney or flue?

No. Electric inserts don't need venting, so your existing chimney can stay in place unused, or you can cap it separately. The insert itself just needs power.

Do I need an electrician to install one?

Many inserts plug into a standard 120V outlet. Higher-output models may require a dedicated circuit or hardwiring, which needs a licensed electrician. Check the electrical spec on the product page.

Can I install an insert myself?

If your opening matches the unit's dimensions and you're using a standard outlet, many customers install these themselves. Units requiring hardwiring should be installed by a licensed electrician.

Do these come with a warranty?

Yes, every unit we sell carries the manufacturer's warranty. Terms vary by brand, so check the individual product page or reach out to our support team for specifics on your model.

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Electric Fireplace Inserts

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Dimplex Revillusion Plug-in Electric Log Set Insert - RLG20/25

Modern Flames Redstone 30" Built-in Electric Fireplace Insert - RS-3021

Modern Flames Redstone 54"Built-in Electric Fireplace Insert - RS-5435

Modern Flames Redstone 26" Built-in Electric Fireplace Insert - RS-2621

Modern Flames Redstone 42" Built-in Electric Fireplace Insert - RS-4229

Sierra Flame 30" Flush Mount Electric Fireplace Insert Fireplace Insert (INS-FM-30)

Amantii Indoor/Outdoor Traditional Built-in Smart Electric Fireplace Insert

Modern Flames Redstone 36" Built-in Electric Fireplace Insert - RS-3626

Dimplex Nova Multi-Fire XHD Series Plug-in Electric Firebox

Modern Flames Orion Traditional Built-In Smart Virtual Electric Fireplace with Real Flame Effect

Simplifire Traditional Built-In Electric Fireplace Insert