Is Your Fireplace Energy Efficient?

Your fireplace is a beautiful and functional asset to your home, producing warm air to make you comfortable. But did you know that it could be even more efficient? Whatever fireplace type you have at home, making a few simple changes can help improve its efficiency so you can enjoy the benefits of a cozy fire without worry.

What Is Fireplace Efficiency?

Before improving your fireplace’s efficiency, you should understand what the term means. Fireplace efficiency measures how well a fireplace produces heat and how little energy it wastes. A high efficiency fireplace will use less fuel and produce more heat, so it’s essential to consider if you’re looking to save money and get the most warmth out of your fires.

There are two main types of fireplace efficiency:

• Thermal Efficiency. This measures how much heat from the fire is used to warm the room and is expressed as a percentage. The higher the number means the fireplace is more efficient.

• Combustion Efficiency. This measures how much potential heat from the fuel is released during burning and is also expressed as a percentage. Again, a higher number means it’s more efficient.

What Are High Efficiency Fireplace Types?

There are three main types of fireplaces, but some are more efficient than others. Overall, gas and electricity are the most efficient ones. Below is a summary of each type:

Gas Fireplaces

Gas fireplaces are more efficient than wood fireplaces, with 50 to 70% thermal efficiency ratings. This means that for every 100 BTUs of heat the fire produces, 50 to 70 BTUs are used to heat rooms.

There are several reasons for this improved efficiency, as follows:

• Gas fires burn cleaner than wood fires, so less smoke and pollutants are in the air.

• They’re also easier to control than wood fires, so you can adjust the heat produced to suit your needs better.

Note that BTU is an abbreviation for British Thermal Unit and is used to measure how much energy is released by burning fuel.

There are three types of gas fireplaces, such as:

Types of Gas Fireplaces

• Inserts

  Gas fireplace inserts fit into an existing fireplace and can run on either natural gas or propane.

• Built-ins

  Built-in gas fireplaces are designed to be integrated directly into a home’s architecture for a seamless appearance.

• Freestanding

  Freestanding gas fireplaces are standalone units that can be placed almost anywhere in the home.

On the other hand, there are two types of fuel that you can use for your energy-efficient gas fireplace, such as:

• Natural Gas

  Natural gas is a fossil fuel extracted from the earth. It burns relatively cleanly and is often the most affordable fuel option for gas fireplaces.

• Propane

  Propane is a liquid petroleum gas typically stored in tanks. While it is generally more expensive than natural gas, it offers greater portability and flexibility.

Electric Fireplaces

Electric fireplaces are even more efficient than gas, with 75 to 99% thermal efficiency ratings. This means that for every 100 BTUs of heat the fire produces, 75 to 99 BTUs are used to heat rooms.

Energy efficient electric fireplaces offer several advantages when compared to gas and wood, such as:

• They’re easy to install since they don’t require venting or a chimney.

• They don’t produce smoke or other pollutants, so they won’t contaminate the air in your home.

• They usually come with adjustable temperature settings so you can adjust the amount of heat produced to suit your needs better.

Meanwhile, there are two types of electric fireplaces, such as:

• Wall-mounted

  Wall-mounted electric fireplaces can be installed directly onto a wall, offering a modern and space-saving design.

• Freestanding

  Freestanding electric fireplaces are standalone units that can be placed almost anywhere in the home for added flexibility.

How to Make Your Fireplace More Efficient?

Here are some helpful guidelines to make an efficient fireplace more efficient:

• Install a programmable thermostat

  A programmable thermostat helps regulate your home’s temperature more efficiently, reducing energy usage when heating is not needed.

• Install a fireback

  A fireback is a metal plate placed behind the fire that reflects heat back into the room. This can increase your fireplace’s heat output by up to 15%.

• Upgrade your gas or electric fireplace insert

  The fireplace insert is a key component that draws in air, heats it, and circulates warm air back into your home. Upgrading an older insert to a newer, energy-efficient model can improve overall performance.

• Install glass doors

  Glass doors help prevent cold air from entering your home through the chimney when the fireplace is not in use, improving warmth and reducing winter energy costs.

• Check your chimney flue size

  Your chimney flue should be properly sized for the fireplace to safely and efficiently vent smoke and pollutants out of your home.

Are Traditional Wood-Burning Fireplaces Efficient?

Traditional wood-burning fireplaces are notoriously inefficient, with thermal efficiency ratings as low as 15 to 30%. This means that for every 100 BTUs (British Thermal Units) of heat produced by the fire, only 15 to 30 BTUs are actually used to heat the room. The rest is lost up the chimney.

There are several reasons for this low efficiency, as follows:

• Wood fires burn best when they have proper airflow, which means the damper must remain slightly open. Unfortunately, this also allows heat to escape through the chimney.

• Wood-burning fires also produce significant smoke and pollutants, which can reduce the amount of usable heat entering the room.

How to Make Your Traditional Wood-Burning Fireplace More Efficient

Although wood-burning fireplaces generally have lower efficiency ratings, many homeowners still prefer the authentic ambiance of a real wood fire. If you want a more energy-efficient wood-burning fireplace, consider the following improvements:

• Install glass doors

  Glass doors help prevent warm indoor air from escaping while keeping cold outdoor air from entering your home.

• Install an insert

  A fireplace insert helps contain and distribute heat more efficiently instead of allowing it to escape through the chimney.

• Install a fireback

  A fireback reflects heat back into the room, improving the overall efficiency of your wood-burning fireplace.

• Install a chimney liner

  A chimney liner reduces smoke and pollutant buildup, improves safety, and helps prevent heat loss through the chimney.

• Use dry, well-seasoned wood

  Dry, seasoned wood burns more efficiently and produces less smoke than wet or green wood. For best results, store firewood in a dry location and season it for at least six months before use.

• Have your chimney cleaned regularly

  Regular chimney cleaning helps maintain proper airflow, improves heating efficiency, and reduces creosote buildup.

• Use an eco-friendly firelog

  Eco-friendly firelogs are made from recycled materials and burn cleaner than traditional wood logs.

• Invest in an EPA-rated wood stove

  EPA-certified wood stoves burn wood more efficiently and produce fewer emissions than traditional wood-burning fireplaces.

Raj Bhavra (Senior Vice President - Operations)

Raj Bhavra leads operations at LG Home Comfort, overseeing installation standards and service delivery across Ontario. TSSA-certified, he specialises in cold-climate heat pumps, high-efficiency furnaces, air conditioning systems, and tankless water heaters ensuring every project is built for efficiency and long-term performance for homeowners.