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

The Touchstone Sideline Infinity 60" electric fireplace insert is a versatile and stylish option for upgrading an existing fireplace opening. Its size (60" wide) is suited for larger fireplaces and it offers flexibility in installation with four different display options, including three-sided views, which is great if you want a modern look and multiple viewing angles. The heating power is adequate for small to medium rooms, warming up to about 400 square feet with two heat settings (750W and 1500W), controlled by a thermostat to keep the temperature comfortable.

This model excels in visual customization, offering 60 different flame and ember bed color combinations, plus realistic LED flames behind cool-touch glass. The included log set and crystals add to the fireplace's modern and appealing design. Controls are easy to use with a touchscreen, remote, and even smartphone app via Wi-Fi, compatible with Alexa and Google Home for voice commands, which adds convenience.

On the installation front, it can be plugged in or hardwired, but because it’s quite large (8" deep and over 17" tall), you’ll want to measure your fireplace opening carefully to ensure a proper fit. It’s built for wall-mount setups, so it suits built-in fireplace openings rather than freestanding use. Safety-wise, the cool-touch glass and thermostat prevent overheating, making it safe for most home environments. While it provides supplemental heat, it’s not meant to replace a main heating source. The electric heater is fairly efficient for its size, but running it on high heat for long periods could impact your electricity bill. If you want a fireplace insert that combines good heating with striking flame effects and smart home features, the Touchstone model offers a compelling combination. Just be sure your fireplace dimensions match and you’re comfortable with the installation options before buying.

The Dimplex Revillusion 30" Built-in Electric Firebox is designed to fit nicely into an existing fireplace, offering a realistic and upscale flame effect thanks to its life-size hardwood-cast logs and a clear herringbone brick backdrop. Its size is manageable for most standard fireplaces, measuring about 31 inches wide and 12 inches deep, making installation by framing and wiring straightforward without the need for venting or gas lines.

The heating capacity provides heat for up to 1800 square feet with a maximum output around 4400 BTU, which should be sufficient for most living rooms but not large open areas. Controls are user-friendly with built-in touch panels and a remote, allowing easy adjustment of flame brightness and color to set the mood. It runs on hardwired power and consumes about 1975 watts, which is typical but means it will impact your electricity bill if used heavily.

Safety-wise, the vent-free design means no emissions, and it doesn’t require a safety screen, but as always, careful installation is key. The flame effect stands out with its brightness and randomness, giving a convincing wood fire look without the mess and maintenance of real logs. The unit is relatively heavy at nearly 68 pounds, so it may require help during installation. It doesn't have advanced smart features but covers the basics well, backed by a 2-year parts warranty. This electric firebox is a great choice for someone wanting a clean, attractive fireplace insert with dependable heating and a cozy flame effect, especially if you want to avoid the hassle of real wood or gas fireplaces. However, if you need a very high heat output or a smaller, portable unit, you might want to look elsewhere.

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.