Electric Fireplace To Put In Existing Fireplace: A Complete Guide
Transform your unused or outdated fireplace into an efficient, clean-burning electric heat source. Learn how to choose the right electric fireplace insert, understand sizing and installation requirements, and find the best options for your home.
View Recommended ModelsWhy Choose an Electric Fireplace Insert? If you have an existing fireplace that is inefficient, rarely used, or requires expensive repairs, an electric fireplace insert offers a practical solution. It provides realistic flames, supplemental heat, and requires no venting, gas lines, or chimney maintenance. This guide will help you make an informed decision.
Why Put an Electric Fireplace in Your Existing Fireplace?
Many homeowners have a traditional wood-burning or gas fireplace that sits unused for most of the year. Converting it to an electric fireplace insert can breathe new life into the space without the hassle of major renovations. An electric insert fits directly into the existing firebox, using the cavity that is already there.
The benefits go beyond convenience. Electric inserts are highly efficient at converting energy into heat, and they produce no smoke, ash, or carbon monoxide. This makes them a safer option for households with children or pets. If you are exploring whether to replace a wood-burning fireplace with electric, this is often the most straightforward path.
No Venting Required
Electric inserts do not produce combustion byproducts, so no chimney, flue, or vent is needed. This simplifies installation and reduces costs significantly.
High Heating Efficiency
Nearly all the electricity consumed is converted into heat. Many models include thermostats and blowers to distribute warmth effectively across the room.
Low Maintenance
No chimney sweeping, ash removal, or creosote concerns. Regular dusting and occasional glass cleaning are typically all that is required.
Realistic Flame Effects
Modern electric inserts use advanced LED and reflection technology to mimic realistic flames, often with adjustable brightness, color, and crackling sound.
Year-Round Enjoyment
You can operate the flame effect without heat, allowing you to enjoy the ambiance even during warmer months.
Cost-Effective Upgrade
Compared to converting to gas or restoring a wood-burning system, an electric insert is generally a more affordable project with fewer permitting requirements.
Types of Electric Fireplace Inserts for Existing Fireplaces
Not all electric inserts are the same. Understanding the differences will help you choose the right model for your firebox dimensions, heating needs, and aesthetic preferences.
| Type | Best For | Heating Capacity | Installation |
|---|---|---|---|
| Insert with Remote | Convenience and modern control | Small to medium rooms | Slides into existing firebox |
| Infrared Insert | Efficient, targeted heating | Medium to large rooms | Slides into existing firebox |
| Fan-Forced Insert | Even heat distribution | Medium rooms | Slides into existing firebox |
| Log Set Insert | Traditional look with realistic logs | Small to medium rooms | Slides into existing firebox |
| Built-In Insert | Clean, flush appearance | Varies by model | Requires precise sizing and framing |
For a deeper comparison of how electric inserts stack up against other options, see our guide on electric vs gas vs wood fireplaces. If you are specifically interested in replacing a wood-burning unit, our article on electric fireplace inserts to replace wood-burning provides detailed insights.
How to Size an Electric Insert for Your Existing Fireplace
Proper sizing is critical. An insert that is too large will not fit, while one that is too small will leave gaps and look unfinished. Follow these steps to measure your existing firebox accurately.
Step-by-Step Measuring Guide
- Measure the front opening width at the widest point. This is the maximum width the insert can have.
- Measure the front opening height from the hearth to the top of the opening.
- Measure the depth of the firebox from the front opening to the back wall. Ensure there is enough room for the insert and its plug.
- Measure the rear width and height if your firebox tapers toward the back. Many inserts have a tapered design to fit these spaces.
- Account for the hearth if it extends into the room. Some inserts require clearance for the blower and controls.
- Check for a nearby outlet or plan to route a cord discreetly. Most electric inserts plug into a standard household outlet.
If you are unsure about the right size for your room's heating needs, consult our fireplace heating capacity and BTU guide. For smaller spaces, you may also want to review options for fireplaces for small spaces.
Installation Overview: What to Expect
One of the biggest advantages of an electric insert is the relative ease of installation. In most cases, you do not need a professional contractor, though some situations may warrant one. Here is a general overview of the process.
Before You Begin
- Ensure the existing fireplace is clean and free of debris.
- Cap or seal the chimney flue to prevent drafts and moisture.
- Verify that a grounded electrical outlet is accessible.
- Read the manufacturer's installation manual thoroughly.
Basic Installation Steps
- Slide the insert into the firebox and check the fit.
- Adjust leveling legs if included.
- Secure the insert with screws or brackets if required.
- Attach the trim or surround to cover gaps.
- Plug in the unit and test all functions.
When to Call a Professional
- If the firebox requires modification or repair.
- If you need a new electrical outlet installed.
- If the chimney needs capping or sealing.
- If you are uncomfortable with DIY electrical work.
For a more detailed walkthrough, see our guide on installing an electric fireplace into an existing fireplace. If you are considering a plug-and-play approach, our article on electric fireplace installation covers the basics.
Pros and Cons of Electric Inserts
Like any home improvement decision, installing an electric insert has both advantages and limitations. Weighing these carefully will help you determine if this is the right choice for your home.
Advantages
- No venting, chimney, or gas line required
- Zero emissions and no carbon monoxide risk
- Can be used with or without heat
- Easy to install in most existing fireboxes
- Low maintenance and cleaning requirements
- Adjustable flame colors, brightness, and speed
- Safe for apartments and rentals in many cases
- No seasonal chimney inspections needed
Limitations
- Requires a nearby electrical outlet
- Heating capacity is limited compared to gas or wood
- Higher operating cost per BTU than natural gas
- Flame realism varies by model quality
- May not fit unusually shaped or very small fireboxes
- Some models produce fan noise during operation
- Not a substitute for central heating in large homes
To understand how electric inserts compare in terms of running costs, see our article on whether electric fireplaces are expensive to run. You may also find our guide on electric vs gas running costs helpful for long-term planning.
Maintenance Tips for Electric Fireplace Inserts
Electric inserts are known for their low maintenance, but a little care goes a long way in extending their lifespan and keeping them looking their best.
Regularly dust the exterior and vents with a soft cloth or vacuum brush attachment. Clean the glass panel with a non-abrasive glass cleaner to maintain clarity. Check the power cord for signs of wear, and ensure the outlet is not overloaded. If your model has a blower, listen for unusual noises that might indicate a need for cleaning or lubrication.
For a comprehensive checklist, see our electric fireplace maintenance guide. If you encounter issues such as the unit not heating or the flame not working, our troubleshooting articles on electric fireplace not heating and flame not working can help.
Frequently Asked Questions
Yes, this is one of the most common applications. The electric insert slides into the existing firebox and uses the cavity that is already there. You will need to ensure the dimensions match and that an electrical outlet is accessible. It is also recommended to cap the chimney to prevent drafts. For more details, see our guide on electric fireplace insert into wood-burning fireplace.
In most cases, no. The electric insert is designed to fit into the existing firebox. You may need to remove old log grates, andirons, or damaged refractory panels, but the surrounding masonry or prefabricated structure typically remains intact. This makes it a relatively non-invasive upgrade.
Most residential electric inserts produce between 1,500 and 5,000 BTUs, with many models capable of heating spaces up to 400 square feet. Some larger or infrared models can heat up to 1,000 square feet. The actual heating capacity depends on the room's insulation, ceiling height, and layout. See our BTU guide for more information.
Yes. Unlike wood or gas inserts, electric models do not require a chimney or vent, so the location of the fireplace relative to exterior walls is not a concern. However, you still need access to a power outlet. If one is not nearby, you may need to have an electrician install one.
Most modern electric inserts are designed with safety features such as automatic shut-off and cool-touch exteriors. However, it is always best to follow the manufacturer's guidelines. Many people operate them overnight, but if you have concerns, you can use the flame effect without heat. See our article on leaving a fireplace on overnight for more safety tips.
Most inserts are rectangular and designed for standard fireboxes. If your firebox is unusually narrow, short, or tapered, you may need a smaller model or one with a tapered back. Measure carefully before purchasing. If a standard insert does not fit, you might consider a freestanding electric fireplace placed in front of the opening instead.
Use a soft, lint-free cloth and a non-ammonia glass cleaner. Avoid abrasive pads or harsh chemicals that can scratch or damage the surface. For detailed instructions, see our guide on how to clean fireplace glass.
With proper care, a quality electric insert can last 10 to 20 years or more. LED components are generally long-lasting, and the heating element may outlast the flame effect in some cases. Regular cleaning and avoiding overloading the circuit can help maximize lifespan. See our article on fireplace lifespan for more details.
Related Guides and Resources
If you are considering other options or want to explore further, these resources can help you make a well-rounded decision:
- Electric Fireplace to Fit in Existing Fireplace – Sizing tips and model selection.
- Best Electric Fireplace Insert for Existing Fireplace – Top-rated picks and features to consider.
- Electric Fireplace Inserts for Wood Burning Fireplace – Specific guidance for wood-burning conversions.
- Cost of Converting Wood Fireplace to Electric – Budgeting and cost factors explained.
- Most Realistic Looking Electric Fireplace Insert – Flame realism comparison.
- Electric Fireplace Insert with Remote Control – Convenience features and options.
- Realistic Electric Fireplace Insert with Heat – Balancing ambiance and warmth.
- Electric Fireplace Insert for Old Wood Burning Fireplace – Revitalizing older masonry fireplaces.
- Installing Fireplace Insert into Existing Fireplace – Step-by-step installation guide.
- Fireplace Maintenance Schedule – Keep your insert in top condition year-round.
Ready to Upgrade Your Fireplace?
Browse our recommended electric fireplace inserts below. These models are selected for their fit, performance, and value across different tiers.
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