10 Easy Steps to Replace a Fireplace Insert

Fireplace Insert Replacement

Replacing a fireplace insert can be a daunting task, but it’s a project that can be completed in a day with the right tools and a little know-how. Whether you’re looking to update the look of your fireplace or replace an old, inefficient insert with a new, high-efficiency model, this guide will walk you through the steps involved in replacing a fireplace insert.

Before you begin, it’s important to gather all of the necessary tools and materials. You’ll need a screwdriver, a wrench, a hammer, a chisel, and a level. You’ll also need a new fireplace insert, fireproof caulk, and insulation. Once you have all of your tools and materials, you can begin the replacement process.

The first step is to remove the old fireplace insert. To do this, you’ll need to disconnect the gas line and electrical wiring. Once the insert is disconnected, you can remove it from the fireplace. Be careful not to damage the fireplace surround when removing the insert.

Removing the Old Fireplace Insert

Before you can install a new fireplace insert, you’ll need to remove the old one. This is a relatively straightforward process, but it’s important to take your time and follow the instructions carefully to avoid damaging your fireplace or chimney.

Tools You’ll Need

Screwdriver
Pry bar
Flashlight
Vacuum cleaner
Safety glasses

Instructions

Turn off the gas or electricity to the fireplace insert. This is a critical safety step, as you don’t want to risk an electrical shock or gas leak while working on the fireplace.
Remove the faceplate of the fireplace insert. This is usually held in place by a few screws. Once the faceplate is removed, you’ll have access to the inside of the fireplace insert.
Disconnect the gas line or electrical wires from the fireplace insert. Be careful not to damage the gas line or electrical wires.
Remove the bolts that are holding the fireplace insert in place. These bolts are usually located on the sides or back of the fireplace insert.
Carefully lift the fireplace insert out of the fireplace. Be careful not to drop the fireplace insert, as it can be heavy.
Clean the fireplace. Once the fireplace insert is removed, you’ll need to clean the fireplace. This includes removing any ashes, soot, or debris.
Inspect the chimney. While you have the fireplace open, take a few minutes to inspect the chimney. Look for any cracks, holes, or other damage. If you find any damage, you’ll need to have it repaired before you install the new fireplace insert.

Preparing the Fireplace for the New Insert

Before you can install the new insert, you need to prepare the fireplace. This will involve removing the old insert, cleaning the fireplace, and making sure that the fireplace is properly ventilated.

Removing the Old Insert

To remove the old insert, you will need to:

Turn off the gas or electricity to the fireplace.
Disconnect the gas line or electrical wires.
Remove the screws or bolts that are holding the insert in place.
Carefully lift the insert out of the fireplace.

Cleaning the Fireplace

Once the old insert is removed, you need to clean the fireplace. This will help to ensure that the new insert will fit properly and that it will operate safely.

To clean the fireplace, you can use a vacuum cleaner to remove any dust or debris. You can also use a brush to scrub the fireplace walls and floor.

Ensuring Proper Ventilation

Fireplaces need to be properly ventilated in order to operate safely. This is because fireplaces produce carbon monoxide, which is a poisonous gas. To ensure that your fireplace is properly ventilated, you need to make sure that there is an adequate supply of fresh air to the fireplace.

You can do this by opening a window or door near the fireplace. You can also install a ventilation fan in the fireplace.

Ventilation Requirements for Fireplaces
Fireplace Type	Ventilation Requirements
Gas Fireplace	1 square inch of ventilation for every 1,000 BTUs of input
Wood-burning Fireplace	1 square inch of ventilation for every 60 square inches of fireplace opening

Installing the New Hearth Pad

Before installing the new hearth pad, you’ll need to remove the old one. If the old hearth pad is made of tile, you can use a hammer and chisel to break it up. If it’s made of stone or concrete, you’ll need to use a power tool, such as a jackhammer or a concrete saw.

Once the old hearth pad is removed, you can install the new one. Start by placing the hearth pad in the desired location. Then, level the hearth pad using a level. Once the hearth pad is level, you can secure it in place using thin-set mortar or construction adhesive.

Once the hearth pad is installed, you can finish the installation by applying grout to the joints between the tiles. Allow the grout to dry completely before using the fireplace.

Additional Information About Installing the Hearth Pad

Here are some additional things to keep in mind when installing a new hearth pad:

Make sure the hearth pad is large enough to extend at least 16 inches beyond the front of the fireplace opening and 8 inches beyond each side.
The hearth pad should be made of a non-combustible material, such as tile, stone, or concrete.
The hearth pad should be at least 1/2 inch thick.
The hearth pad should be level and securely attached to the floor.

Type of Hearth Pad	Thickness	Material
Tile	1/2 inch to 1 inch	Ceramic, porcelain, or natural stone
Stone	1 inch to 2 inches	Marble, granite, or slate
Concrete	1 inch to 4 inches	Poured concrete or precast concrete

Setting the Fireplace Insert

1. Secure the Firebox: Lift the fireplace insert into place and align it with the opening. Use shims or spacers to ensure a snug fit and prevent gaps that may allow heat or smoke to escape.

2. Connect the Vent: Attach the vent pipe to the outlet on the back of the insert. Use sealant around the connection to prevent leaks.

3. Connect the Gas or Electric Supply: Connect the gas line or electrical wires to the appropriate outlets on the insert according to the manufacturer’s instructions. Ensure that all connections are secure and gastight.

4. Level and Secure the Insert:

Use a Level: Place a level on top of the insert to check for levelness. Adjust the shims or spacers as needed until the insert is level both front to back and side to side.
Secure the Insert: Once the insert is level, secure it to the fireplace surround using screws or bolts. Use washers to distribute the load and prevent damage to the fireplace surround.
Create a Backstop: Build a backstop behind the insert using fire-resistant materials, such as firebricks or insulation, to prevent heat and flames from escaping into the fireplace cavity.

5. Seal the Insert: Seal any gaps between the insert and the fireplace surround using caulk or high-temperature sealant. This will prevent drafts and heat loss.

Connecting the Gas Line

Connecting the gas line to your fireplace insert is a crucial step that should be performed carefully and according to the manufacturer’s instructions. Here are some detailed guidelines to ensure a safe and functional connection:

1. Shut Off the Gas Supply

Before you begin any work, make sure to turn off the gas supply at the main valve located outside your home or at the meter. This will prevent any gas from flowing into the fireplace during the installation process.

2. Locate the Gas Line Connection

Identify the gas line connection on your fireplace insert. It is typically a pipe or fitting located at the rear or bottom of the unit. Make sure the connection is clean and free of any debris.

3. Connect the Gas Line

Connect the gas line to the insert using a flexible gas connector. Ensure that the connector is the correct size and type for your fireplace insert and gas line. Tighten the connections securely using a wrench.

4. Apply Pipe Dope

To prevent gas leaks, apply pipe dope to the male threads of the gas line connection before tightening. Pipe dope is a sealant that helps create a tight and gas-proof connection.

5. Pressure Test the Gas Line

Once the gas line is connected, perform a pressure test to ensure there are no leaks. To do this, follow these steps:

Turn the gas supply back on.
Apply a soap solution to all the gas connections.
Observe the connections for any soap bubbles, which indicate a leak.
If you detect any leaks, tighten the connections further or use additional pipe dope.
Once you are certain there are no leaks, proceed with the remaining installation steps.

Running the Electric Line

To install an electric fireplace insert, you’ll need to run an electrical line to the location. If you’re not comfortable doing this yourself, it’s best to hire an electrician. Here’s a step-by-step guide to running the electric line:

Determine the location of the electrical panel and the fireplace insert.

Measure the distance between the two points and purchase the appropriate length of electrical wire.

Run the wire from the electrical panel to the fireplace insert, making sure to secure it every few feet with wire staples or other fasteners.

Connect the wire to the electrical panel and the fireplace insert according to the manufacturer’s instructions.

Turn on the power to the fireplace insert and test it to make sure it’s working properly.

Additional Information

Amperage Wire Gauge

15 amps 14 AWG

20 amps 12 AWG

30 amps 10 AWG

Amperage	Wire Gauge
15 amps	14 AWG
20 amps	12 AWG
30 amps	10 AWG

Connecting the Vent Pipe

Once the insert is in place, you will need to connect the vent pipe. The vent pipe is a metal pipe that carries the exhaust gases from the insert to the outside of the house. The vent pipe must be properly sized and installed to ensure that the insert operates safely and efficiently.

To connect the vent pipe, you will need the following materials:

Vent pipe
Vent pipe adapter
Vent pipe sealant
Screws
Drill

To connect the vent pipe, follow these steps:

Measure the distance from the insert to the outside of the house.
Cut the vent pipe to the correct length.
Attach the vent pipe adapter to the insert.
Seal the joint between the vent pipe and the adapter with vent pipe sealant.
Drill a hole in the wall for the vent pipe.
Insert the vent pipe into the hole and seal the joint with vent pipe sealant.
Secure the vent pipe to the wall with screws.

Vent Pipe Size	Insert Size
2-inch	Up to 40,000 BTU
3-inch	40,000 to 60,000 BTU
4-inch	Over 60,000 BTU

Finishing the Installation

Now that the insert has been fitted, it’s time to finish the installation.

Connect the gas line. Once the insert is in place, you’ll need to connect the gas line. This should be done by a qualified gas fitter.
Connect the electrical wiring. The insert will also need to be connected to an electrical outlet. This should be done by a qualified electrician.
Install the trim. The trim will help to finish the look of the insert and hide the edges of the opening.
Caulk around the insert. Caulking around the insert will help to prevent drafts and keep the heat in.
Turn on the insert. Once everything is connected, you can turn on the insert. Follow the manufacturer’s instructions for turning on the insert and setting the desired temperature.
Enjoy the warmth. Your fireplace insert is now installed and ready to enjoy.

Checking for Gas Leaks

It’s important to check for gas leaks after installing a fireplace insert. This can be done using a gas leak detector. Follow the manufacturer’s instructions for using the detector.

Signs of a Gas Leak	What to Do
Smell of gas	Evacuate the area and call the gas company
Bubbling in water near the gas line	Evacuate the area and call the gas company
Dead or dying plants near the gas line	Evacuate the area and call the gas company

Safety Considerations

Replacing a fireplace insert requires careful attention to safety precautions to minimize the risk of injuries or damage.

Here are some key safety considerations:

1. Ensure that the fireplace is completely cool before starting work.

2. Turn off all gas or electrical supply to the fireplace.

3. Cap off any gas lines to prevent leaks.

4. Wear appropriate protective gear, such as gloves and safety glasses.

5. Have a fire extinguisher readily available in case of emergencies.

6. Check the manufacturer’s instructions carefully before proceeding.

7. Keep the work area clear of flammable materials.

8. Allow ample time for the old insert to cool down before removing it.

9. Dispose of the old insert properly. Most municipalities have regulations regarding the disposal of hazardous materials, so it’s important to check with your local authorities.

Hazardous Materials	Disposal Method
Asbestos	Contact a licensed asbestos removal specialist.
Lead	Wrap in plastic and dispose of at a hazardous waste disposal site.
Creosote	Burn in a properly rated wood stove or fireplace.

By following these safety precautions, you can reduce the risk of accidents and ensure a successful fireplace insert replacement.

Troubleshooting Common Issues

1. The new insert doesn’t fit into the existing fireplace.

Check the dimensions of the new insert to make sure it is the correct size for your fireplace. If it is too large or too small, you may need to modify the fireplace opening or purchase a different insert.

2. The insert won’t turn on.

Check the power supply to make sure the insert is getting electricity. If the power is on, check the circuit breaker or fuse box to make sure the circuit is not tripped or blown. You may also need to check the remote control or thermostat to make sure they are working properly.

3. The insert is not heating properly.

Check the fuel supply to make sure the insert is getting enough fuel to burn. If the fuel supply is adequate, check the air supply to make sure the insert is getting enough air to burn the fuel efficiently. You may also need to check the flue to make sure it is clear of any obstructions.

4. The insert is making strange noises.

Check the insert for any loose parts or debris that may be causing the noise. If you cannot find the source of the noise, you may need to contact a qualified technician for assistance.

5. The insert is leaking smoke or gas.

Check the seals around the insert to make sure they are intact and not allowing smoke or gas to escape. If the seals are damaged, you may need to replace them. You should also check the flue to make sure it is clear of any obstructions and that it is properly sealed to the insert.

6. The insert is overheating.

Check the air supply to make sure the insert is getting enough air to cool down. You may also need to check the flue to make sure it is clear of any obstructions and that it is properly sealed to the insert.

7. The insert is not working at all.

8. The insert is smoking up the room.

Check the flue to make sure it is clear of any obstructions and that it is properly sealed to the insert. You may also need to check the air supply to make sure the insert is getting enough air to burn the fuel efficiently.

9. The insert is not producing enough heat.

10. The insert keeps tripping the electrical circuit.

The insert may be drawing too much power for the circuit it is connected to. Check the amperage rating of the circuit and the amperage draw of the insert. If the amperage draw of the insert is greater than the amperage rating of the circuit, you will need to install a new circuit with a higher amperage rating. You may also need to check the wiring of the insert to make sure that it is not loose or damaged.

How To Replace A Fireplace Insert

Replacing a fireplace insert can be a challenging task, but it is possible to do it yourself with the right tools and materials. Here are the steps on how to replace a fireplace insert:

Remove the old insert. To do this, you will need to disconnect the gas or electric line, and then remove the screws or bolts that are holding the insert in place. Once the insert is loose, you can carefully lift it out of the fireplace.
Clean the fireplace. Once the old insert is removed, you will need to clean the fireplace. This includes removing any ashes or debris, and then vacuuming or sweeping the area. You may also want to clean the chimney flue at this time.
Install the new insert. To do this, you will need to first place the insert in the fireplace. Once the insert is in place, you will need to connect the gas or electric line, and then secure the insert with screws or bolts. Be sure to follow the manufacturer’s instructions for installation.
Test the insert. Once the insert is installed, you will need to test it to make sure that it is working properly. To do this, turn on the gas or electric supply and then light the insert. If the insert is working properly, you will see a flame. If you do not see a flame, you may need to troubleshoot the problem.