10 Best Electric Fireplace Insert For Existing Fireplace 2026 in the United States

The PuraFlame Western 33" Electric Fireplace Insert is designed to fit an existing fireplace space with overall dimensions of 44.1" wide, 31.5" high, and 8.8" deep. It offers a realistic flame effect with three settings for intensity and brightness, and its resin log and ember bed mimic the look of a wood-burning fireplace. The insert also includes a remote control for convenience and an adjustable thermostat, allowing it to provide supplemental heat for rooms up to 400 sq. ft. However, it is not intended as a primary heat source.

Installation is straightforward as the unit can be placed directly on the floor and plugged into a standard 120V outlet, but it cannot be hard-wired, which might limit placement options for some users. The unit is energy-efficient, utilizing LED technology for flame effects, and comes with safety features like a cool-touch surface and overheat protection.

Some potential downsides include its inability to serve as a main heat source and the fact that it comes in two packages, which may arrive on different days. Additionally, while customer service is noted as responsive, the one-year warranty might seem limited compared to other products in the market.

The Dimplex Revillusion 42 Inch Built-in Electric Firebox is a solid choice for those looking to update an existing fireplace with a realistic and efficient electric insert. Its standout feature is the Revillusion flame technology, which creates flames that look remarkably like a natural fire, enhanced by handcrafted faux logs and a herringbone brick interior that adds to its authentic appearance. The 42-inch size fits many standard fireplaces and provides supplemental heat suitable for rooms up to 1,000 square feet, making it practical for living spaces that need extra warmth.

Installation is straightforward since it requires no venting, gas lines, or special tools, and users can choose between plugging it into a standard 120V outlet or hardwiring it for a cleaner look. The included remote control and thermostat allow easy temperature adjustment, adding to user convenience. Safety is improved by the electric design with no real flames, reducing fire risks associated with traditional fireplaces.

While the heater can warm a decent-sized room, it won't replace central heating in larger homes. The product is also fairly heavy at over 110 pounds, which might require assistance during installation. This insert is best suited for those who want the charm of a real fire's look and supplemental heating without the hassle of venting or gas connections. Its realistic visuals and ease of installation make it a great upgrade for existing fireplaces, especially in medium-sized rooms.

The Dimplex Revillusion 36" Built-in Firebox is a solid choice for upgrading an existing fireplace with an electric insert. It fits into standard fireplace openings with its 37-inch width and 12-inch depth, allowing for flexible installation—you can surface mount it or recess it fully for a clean built-in look. Heating-wise, it covers about 440 square feet with up to 2575 watts of power, making it suitable to comfortably warm a medium-sized living room.

A standout feature is the flame effect, which uses a Mirage Flame Panel with partially frosted acrylic to create a realistic, reflection-free flame appearance that adds a cozy ambiance without requiring a real fire. The unit includes a thermostat and remote control, making it easy to adjust heat and flame settings from across the room. Safety is addressed with vent-free operation, which simplifies installation since no external venting is required, though usage guidelines for indoor air quality should still be followed. Energy efficiency is reasonable for an electric heater of this size, though power consumption increases at higher heat settings.

The unit carries a two-year warranty, indicating reliability. At nearly 75 pounds, it is somewhat heavy, so professional installation might be advisable. While the firebox provides good heat, it may not be adequate for larger open-plan spaces. The elegant herringbone design may not suit every decor style. This fireplace insert is ideal for users who want a realistic flame effect and dependable heating for a medium-sized room, along with straightforward installation options and remote comfort control.