How do I measure for an electric fireplace insert?

Measure the width, height, and depth of your existing fireplace opening. Also measure the interior rear width and height. Choose an insert that is slightly smaller than your opening to allow for easy installation and proper airflow.

Electric Fireplace Inserts for Existing Fireplaces

Transform your outdated wood-burning or gas fireplace into a clean, efficient, and beautiful focal point. Learn how to choose the right electric insert, understand installation requirements, and find the perfect fit for your home.

Explore Recommended Inserts

Why consider an electric fireplace insert? If you have an existing fireplace that is inefficient, rarely used, or simply outdated, an electric insert offers a practical and cost-effective upgrade. It requires no chimney, no venting, and no gas line. You get instant ambiance and supplemental heat with the flip of a switch.

Electric fireplace inserts are designed to fit into the opening of your existing masonry or prefabricated fireplace. They are a popular choice for homeowners who want to modernize their living space without the expense and complexity of a major renovation. Whether your current fireplace is wood-burning, gas, or simply a decorative opening, there is likely an electric insert that can bring it back to life.

This guide covers everything you need to know: how electric inserts work, the key features to compare, sizing and installation considerations, and how to choose the best model for your needs. By the end, you will have a clear understanding of whether an electric insert is right for you and how to select one with confidence.

Why Choose an Electric Fireplace Insert?

An electric fireplace insert is a self-contained unit that slides into your existing fireplace opening. Unlike traditional fireplaces, it does not burn fuel or produce smoke, so no chimney or vent is required. This makes it one of the simplest and most versatile fireplace upgrades available.

No Venting Required

Because electric inserts produce no combustion byproducts, they do not need a chimney or flue. This means you can install one in any room with a standard electrical outlet.

Easy Installation

Most electric inserts are plug-and-play. They slide into the existing opening and plug into a standard outlet. No permits, no gas lines, and no structural changes are typically needed.

Zone Heating Efficiency

Electric inserts are nearly 100% efficient because all the heat they generate stays in the room. You can warm only the space you are using, reducing overall energy consumption.

Year-Round Ambiance

Enjoy the look of a fire with or without heat. Most models let you operate the flame independently, so you can create a cozy atmosphere even in summer.

Low Maintenance

No ash to clean, no chimney to sweep, and no fuel to store. Electric inserts require only occasional dusting and an annual inspection of the cord and plug.

Safe Operation

Electric inserts produce no carbon monoxide, and the exterior surfaces remain cool to the touch. They are a safe choice for homes with children and pets.

Pros and Cons of Electric Inserts

Before you decide, it is important to weigh the advantages against the limitations. Here is an honest look at what electric inserts offer.

Advantages

No chimney, vent, or gas line required
Simple DIY installation in most cases
Very low maintenance compared to wood or gas
Safe for indoor air quality — no smoke or fumes
Can be used with or without heat
Compatible with remote controls and smart home systems
Runs on standard household electricity

Limitations

Heat output is typically lower than gas or wood
Requires a nearby electrical outlet
Flame realism varies by model — premium units are more convincing
Fan or blower noise may be noticeable on some models
Not suitable as a primary heat source for large homes

For many homeowners, the benefits far outweigh the drawbacks. If you want a convenient, low-maintenance fireplace that provides supplemental heat and year-round ambiance, an electric insert is an excellent choice. If you need a primary heat source for a large area, you may want to consider a gas insert with a blower or a wood-burning stove insert instead.

Types of Electric Fireplace Inserts

Electric inserts come in several styles and configurations. Understanding the differences will help you narrow down your options.

Type	Best For	Key Features
Standard Insert	Traditional fireplace openings	Fits into masonry or prefab fireplaces; includes flame effect and heater
Built-In Insert	Clean, flush installation	Recessed into the wall or fireplace surround for a seamless look
Corner Insert	Corner fireplace openings	Angled design to fit corner spaces; space-saving
Linear Insert	Modern, contemporary spaces	Wide, low-profile design with a long flame bed
Double-Sided Insert	See-through applications	Flame visible from two sides; ideal for room dividers

If you are looking for a realistic flame effect, consider a most realistic electric fireplace insert with heat. These models use advanced LED and mirror technology to mimic the look of a real fire. For a more immersive experience, some inserts include crackling sound effects that add to the ambiance.

How to Measure for an Electric Insert

Getting the right size is critical. An insert that is too large will not fit, while one that is too small may look awkward and leave gaps. Follow these steps to measure your existing fireplace opening accurately.

Measure the front opening width. Use a tape measure to record the width at the widest point of the opening.
Measure the front opening height. Record the height from the hearth to the top of the opening.
Measure the depth. Measure from the front face to the back wall of the firebox.
Measure the rear width and height. Many fireboxes taper toward the back. Measure the rear dimensions as well.
Check for obstructions. Look for a gas line, damper, or other components that may interfere with installation.
Allow for clearance. Choose an insert that is slightly smaller than your opening — typically 1–2 inches smaller in width and height — to allow for easy installation and airflow.

Tip: If your existing fireplace is a zero-clearance unit, you may have more flexibility with insert sizes. Always check the manufacturer's specifications for the exact dimensions of the insert you are considering.

For more detailed guidance on sizing, see our fireplace sizing worksheet and BTU guide.

Installation Overview

One of the biggest advantages of electric inserts is how easy they are to install. In most cases, you can complete the installation yourself in under an hour.

Here is a general overview of the process:

Step 1: Turn off power to the area if you will be hardwiring the unit. Most inserts plug into a standard outlet.
Step 2: Remove any old fireplace components, such as grates, log sets, or glass doors.
Step 3: Clean the firebox thoroughly to remove ash and debris.
Step 4: Slide the electric insert into the opening. Adjust leveling feet if needed.
Step 5: Secure the insert according to the manufacturer's instructions.
Step 6: Plug in the unit or connect it to a hardwired circuit.
Step 7: Test the flame and heater functions.

If you are not comfortable working with electrical components, or if you need to install a new outlet near the fireplace, consider hiring a licensed electrician. For a more detailed walkthrough, see our electric fireplace installation guide.

Note: If you are replacing a wood-burning fireplace with an electric insert, you may need to cap or seal the chimney to prevent drafts. This is a simple job that most homeowners can do with a chimney cap or inflatable draft stopper.

Key Features to Compare

Not all electric inserts are created equal. Here are the features that matter most when comparing models.

Heating Capacity

Measured in BTUs, this determines how much space the insert can warm. Entry-level models typically heat around 400 square feet, while mid-range and premium units can heat up to 1,000 square feet or more.

Flame Realism

Look for LED flame technology with multiple color options and adjustable brightness. Premium models offer the most realistic flame effects, often with ember beds and logs that glow.

Thermostat and Remote

A built-in thermostat maintains your desired temperature, while a remote control lets you adjust settings from across the room. Many models now offer smart home integration via Wi-Fi.

Noise Level

Some models have louder fans than others. If the insert will be in a bedroom or living area, look for a model described as quiet or whisper-quiet.

Safety Features

Automatic shut-off, cool-touch glass, and overheat protection are important, especially if you have children or pets. See our safety features guide for more information.

Power Source

Most inserts plug into a standard outlet. Some models can be hardwired for a cleaner look. Consider your electrical setup before choosing. See our guide on hardwired vs plug-in electric fireplaces.

Electric vs Gas vs Wood Inserts

If you are still deciding between fuel types, this comparison can help.

Feature	Electric Insert	Gas Insert	Wood Insert
Venting Required	No	Yes (direct vent or B-vent)	Yes (chimney liner required)
Installation Complexity	Low (DIY-friendly)	Moderate to high (professional recommended)	High (professional recommended)
Heat Output	Supplemental	Moderate to high	High
Maintenance	Very low	Low to moderate	Moderate to high
Ambiance	Good to excellent	Excellent	Excellent
Indoor Air Quality	No impact	Very low emissions	Requires proper draft

For a deeper comparison, see our articles on electric vs gas vs wood fireplaces and electric vs gas running costs.

Maintenance Tips for Electric Inserts

Electric inserts are among the lowest-maintenance fireplace options available. Here is what you need to know to keep yours running smoothly.

Dust the exterior and vent openings every few weeks to prevent dust buildup, which can affect performance and cause odors.
Clean the glass with a soft, damp cloth. Avoid abrasive cleaners. See our guide on how to clean fireplace glass.
Check the cord and plug regularly for signs of wear or damage. Replace if necessary.
Inspect the heater and fan annually. Remove any debris that may have accumulated. See our electric fireplace maintenance guide.
Test the remote control and replace batteries as needed. If the remote stops working, see our remote troubleshooting guide.

For a complete seasonal maintenance schedule, see our fireplace maintenance checklist.

Common Issues and Troubleshooting

While electric inserts are reliable, you may encounter occasional issues. Here are some common problems and their solutions.

Problem	Possible Cause	Solution
No heat, but flame works	Heater switch off or thermostat set too low	Check the heater switch and thermostat settings. See our electric fireplace not heating guide.
Flame not working, but heat works	Flame effect switch off or LED issue	Check the flame switch. If the issue persists, see our flame troubleshooting guide.
Remote not working	Dead batteries or signal interference	Replace batteries. If that does not work, see our remote fix guide.
Tripping the breaker	Overloaded circuit or faulty wiring	Plug the insert into a different circuit. If the problem continues, see our breaker troubleshooting guide.
Buzzing or humming noise	Fan motor or electrical interference	Check for loose parts. If the noise persists, see our noise troubleshooting guide.

Recommended Electric Fireplace Inserts

To help you find the right model, we have curated a selection of highly rated electric fireplace inserts. These products are chosen based on performance, features, and value. Whether you are looking for a budget-friendly option or a premium model with the most realistic flame, you will find something here.

Best Electric Fireplace Inserts for Existing Fireplaces

⚠️ AFFILIATE DISCLOSURE: This website contains affiliate links. As an Amazon Associate, we earn from qualifying purchases. If you make a purchase through these links, we may receive a small commission at no additional cost to you. Read our full affiliate policy.