How to Convert a Wood Fireplace to Electric

An old wood-burning fireplace can cost you heat instead of adding it. Open dampers, cracked flues and warm air pulled up the chimney make many masonry fireplaces a net loss in winter. Learning how to convert a wood fireplace to electric fixes that: you keep the hearth and mantel, close off the chimney, and add a heater that turns on with a remote. Done right, the conversion takes one or two days and needs no venting at all.

The basic sequence is simple. Have the chimney cleaned and inspected, close and seal the damper or install a chimney balloon or top-sealing cap, get power to the firebox through a safe route, choose between a full electric fireplace insert and a log set, then finish the surround. The rest of the work is in the details, and homeowners asking how to convert a wood fireplace to electric are usually surprised how little of it requires tearing anything out.

How to Convert a Wood Fireplace to Electric: Planning

Start by measuring the firebox opening: front width, rear width, height and depth. Fireboxes are often tapered, so the rear measurement matters for insert fit. Write down where the nearest outlet is and whether the hearth has any cracks or loose bricks. If you are researching a wood to electric fireplace conversion for a home built before the 1980s, note that too, since some old fireplace panels, cement boards and mortar products can contain asbestos.

Decide on the end goal before buying anything:

• Electric fireplace insert: a boxed unit with a glass front and trim kit that fills the firebox. It delivers the most realistic look and directs heat into the room through a blower. This is the best option for most conversions.
• Electric log set: a log grate with built-in flame effect and heater that sits on the hearth floor inside the open firebox. It costs less and keeps the open look, but heat output can drift up the chimney unless the flue is sealed tight.
• Wall-mount unit over a closed firebox: some homeowners close the firebox entirely and hang a unit on the wall. That is a bigger renovation and changes the room.

Step 1: Clean and Inspect the Chimney

Even though you will never burn wood again, have a certified chimney sweep clean and inspect the flue. Years of creosote, nests or debris can fall into a new insert, and creosote leaves a stubborn smell when warmed. The sweep can also confirm that the crown, cap and flashing are sound so water does not drip into the firebox and onto electrical equipment.

If the chimney serves a gas furnace or water heater through a separate flue, make sure nobody seals that flue by mistake. Only the fireplace flue gets closed.

Step 2: Close and Seal the Damper

Air leaks are the biggest energy cost of an unused fireplace. Close the existing damper and check it for gaps. Old throat dampers rarely seal well, so choose one of these upgrades:

• Chimney balloon or plug: an inflatable or foam plug that fits up into the flue over the damper. Inexpensive and removable.
• Top-sealing damper: a spring-loaded cap at the chimney crown that seals with a gasket. Installed by a chimney pro, it stops drafts and keeps rain out.
• Insulated block-off plate: a rigid panel sealed with high-temperature sealant inside the throat. Common with full inserts.

Seal mortar cracks in the firebox at the same time. Fresh, clean masonry also makes the insert fit tighter.

Step 3: Bring Power to the Firebox

Most electric inserts and log sets use a standard 120-volt plug and a 1,500-watt heater, which draws about 12.5 amps. That is a big load, so a dedicated 15 or 20 amp circuit is recommended. You need a way to get power to the unit without running a cord across the hearth.

Common approaches include:

• Outlet beside the fireplace: if an outlet sits within reach of the cord, run the cord neatly along the side of the insert through the trim gap.
• Outlet in the firebox: an electrician can run a circuit through the damper area or the side wall and install a box inside the firebox. This hides the cord entirely.
• Outlet in the hearth or mantel: sometimes the easiest route is through the mantel leg or wall to one side.

Running new wiring into a firebox is work for a licensed electrician. They will choose cable and boxes suitable for the location, keep the run away from any residual heat and moisture, and pull a permit where required. If anyone opens an existing box during the job, turn off the breaker and confirm power is off with a non-contact voltage tester first, and never work on wiring that is still powered. Plug the fireplace straight into the outlet and never use an extension cord or power strip.

Step 4: Choose and Fit the Insert or Log Set

Match the insert to the firebox measurements, leaving the clearance the manual requires around the sides and top. Most manufacturers publish minimum and maximum opening sizes, plus a trim kit that covers gaps around the face. Look for these features:

• A heater with a thermostat and at least two output settings
• Independent flame and heat controls so you can enjoy flames in summer
• Overheat protection and an automatic shut-off
• A UL-listed or equivalent safety certification
• A front-facing heat outlet so warm air enters the room rather than the chimney

To install, set the insert on the hearth floor, connect the cord, slide it back into the firebox, and attach the trim kit. Leave the vents clear. Do not stuff insulation or fabric into the gaps around the unit, since the heater needs airflow to run cool.

For a log set, place the grate centered in the firebox, route the cord to the outlet, and make sure the flue is sealed so the heat does not rise and escape.

Step 5: Finish the Surround

The conversion is a good time to update the look. Painting old brick, refacing with tile or stone veneer, or replacing the mantel can make the fireplace feel new. Keep combustible materials outside any clearances the insert manual lists. If you are painting brick, use a masonry primer and a paint rated for the surface.

Pre-1978 homes may have lead paint on trim and mantels, so test before sanding. Pre-1980s fireplace components can contain asbestos; have suspect materials tested before cutting or removing them.

Fire and Electrical Safety

An electric fireplace is far safer than wood, but it still uses a heating element. Keep these practices in mind:

• Use a dedicated circuit and plug directly into the wall.
• Keep furniture, curtains and decor about 3 feet away from the front of the heater.
• Never cover the heater outlet or block air intakes.
• Do not coil excess cord behind the unit or under rugs, where heat can build.
• Check the plug and outlet occasionally for discoloration or warmth, which signal a poor connection.
• Keep the chimney and flue in good repair so water stays out.

Troubleshooting

• Cold drafts around the insert: the flue seal is leaking. Re-seat the balloon or have a top-sealing damper installed.
• Smoky smell when the heater runs: residual creosote or soot in the firebox. Clean the firebox walls and have the flue swept.
• Breaker trips: the fireplace shares a busy circuit. A dedicated circuit solves it.
• Insert does not fit: measure again at the rear and the top of the firebox, where taper and lintels reduce space. Choose a smaller model or a trim kit with a wider overlap.
• Water in the firebox: chimney cap or crown failure. Fix it before running any electrical equipment.

Cost Ranges

Electric log sets usually cost a few hundred dollars. Full inserts with trim kits often run several hundred to around $2,000. Chimney cleaning and inspection adds a modest service fee, and a top-sealing damper typically costs a few hundred dollars installed. Running a new circuit and outlet to the firebox commonly costs a few hundred dollars or more, depending on access. Surround updates range from a can of paint to several thousand dollars for stone veneer. Once you know how to convert a wood fireplace to electric yourself, the main savings come from doing the insert fitting and surround finishing on your own while leaving wiring and chimney work to licensed trades.

When to Call a Licensed Professional

A fireplace conversion to electric is mostly DIY, but some steps belong to pros. A licensed electrician should handle any new circuit or outlet inside or near the firebox. A certified chimney sweep should inspect and clean the flue and install top-sealing dampers. If the masonry is cracked, the chimney leans or the hearth is failing, a mason should evaluate it before you install anything. Testing for lead and asbestos should be done before disturbing old materials.