Can you install a wood-burning insert in an old fireplace?

Installing an insert in an old fireplace: what you need to know

Do you have an old fireplace that you love but that no longer heats efficiently? Are you thinking about installing an insert to combine the charm of the past with today’s thermal comfort, but you’re unsure whether it’s really possible? At Cheminées Seguin, we often get asked this question. Here’s everything you need to know before starting your renovation project.

Can you install a wood-burning insert in an old fireplace?

The answer is yes, in most cases, it is entirely possible to install an insert in an old fireplace. In fact, this is one of the key advantages of inserts: they are designed to fit into existing hearths. This allows you to enjoy the performance of a modern appliance while maintaining the authentic charm of your original fireplace. However, this installation requires several technical parameters to be taken into account to ensure it is done properly and safely:

• The insert’s dimensions must be suited to those of the masonry hearth.
• The chimney flue must be in good condition and correctly sized.
• Insulation may be necessary to optimize the insert’s efficiency.
• Air intake and warm air circulation must be planned.

Before starting any work, it is essential to have your fireplace assessed by a professional. They will confirm the feasibility of the project, recommend any necessary modifications, and advise you on the most suitable appliance for your setup. These steps are key to a successful insert installation and to fully enjoying its benefits!

Why install an insert in an old fireplace?

If you’re considering upgrading your old fireplace by adding an insert, it’s likely because you want to benefit from the many advantages this type of appliance offers. Performance, savings, aesthetics… Let’s explore the good reasons to go ahead.

Increase efficiency and save money

The main advantage of inserts over traditional open fireplaces is, without a doubt, their much higher efficiency. While a classic fireplace offers a modest 10 to 15% efficiency, a modern insert can reach 70 to 80%, depending on the model. In concrete terms, this means that for the same amount of wood burned, your insert will release up to 8 times more heat into the room!

By choosing this efficient heating method, you’ll significantly reduce your fuel consumption while enjoying better thermal comfort. A great way to lower your bills, especially if you rely mainly on wood for heating.

Protect the environment and your health

Another major benefit of inserts: their reduced environmental impact. Thanks to optimized combustion and high efficiency, they emit fewer fine particles and less carbon monoxide into the air than old fireplaces.

By choosing a “Flamme Verte 7 étoiles” certified insert, you’re guaranteed an eco-friendly appliance that complies with the latest European standards. It’s a responsible and ecological choice that also adds value to your home if you plan to sell.

Modernize your fireplace while preserving its charm

Often overlooked, installing an insert is also an excellent way to breathe new life into an old fireplace without altering its original style. Whether you opt for a traditional log model or a more modern pellet version, you’ll find a unit that fits harmoniously into the existing hearth.

Stone or brick cladding, cast iron color options, glass door design… There are plenty of ways to personalize your renovated fireplace, making it a unique decorative element that combines performance with character. With an insert, you enjoy the thermal comfort of modern heating and the unmatched authenticity of a vintage fireplace. All the charm of a wood fire — without the downsides!

As you can see, there are plenty of reasons to install an insert. But it’s crucial to ensure your fireplace meets the technical requirements. Hearth dimensions, flue condition, insulation… Let’s review the key elements to check before starting.

Key steps to install an insert in an old fireplace

Convinced by the benefits of inserts and ready to upgrade your old fireplace? Here’s our practical guide to make sure your installation is feasible and completed successfully.

Have your fireplace inspected by a professional

Before anything else, have your fireplace checked by a certified RGE (Reconnu Garant de l’Environnement) professional. This technical assessment will verify that your hearth meets safety standards and is suitable for an insert.

Several elements will be examined closely:

• The hearth size, which must be large enough for the appliance.
• The flue condition, which must be sound, airtight, and properly sized.
• The presence of a compliant fresh air intake and smoke evacuation.
• Insulation around the hearth and flue to prevent fire risks.

After the assessment, the professional will issue a certificate of compliance and advise on any necessary work (flue lining, insulation…) before the insert installation.

Choose the right insert for your needs and setup

Once the assessment is done, it’s time to choose the appliance. Again, rely on an expert to help you pick the model best suited to your heating needs and your fireplace’s specifics. Choose a reputable brand like SEGUIN, known for quality, efficient, and durable inserts.

Several factors should be considered:

• The heating power, adapted to the room size.
• Fuel type (logs, pellets, or both), depending on your preference.
• Insert dimensions, which must be smaller than the hearth.
• Energy efficiency, ideally above 75%.
• The look (unit design, door finish) that suits your décor.

Don’t hesitate to request a detailed quote and compare it with other professionals. Financial assistance (Ma Prime Rénov, energy subsidies) may be available for purchasing a high-performance insert.

Entrust the installation to a qualified professional

Now comes the installation! Fitting an insert into an old fireplace must be done by a certified RGE professional. In addition to placing the appliance itself, this may include preliminary work such as:

• Dismantling the old hearth and decorative elements.
• Cleaning and preparing the fireplace.
• Upgrading and insulating the flue (lining, casing).
• Creating air intake and smoke exhaust systems if required.

Once installed and connected, the technician will test the insert, adjust combustion settings, and show you how to operate and maintain the unit. You’ll receive an installation report certifying the work was done correctly.

Now you know how to safely install an insert into your old fireplace and enjoy efficient heating. Still have questions about costs, subsidies, or choosing the right unit? The SEGUIN experts are here to support you at every stage of your renovation project!

Choose the right SEGUIN insert for an old fireplace

Want to equip your old fireplace with a high-performance insert? SEGUIN, a French brand specializing in wood heating for over 40 years, offers a wide range of inserts suited for renovation. Here’s an overview of the options to find the one that fits your needs.

Seguin log inserts: Combining performance and tradition

For lovers of traditional wood fires, SEGUIN’s log inserts are an ideal choice. Available in a variety of sizes (6 to 14 kW) and dimensions, they fit perfectly into old hearths. With up to 80% efficiency, they provide optimal heat through convection and radiation.

Some top models include:

• The Antao fireplace, with a sleek modern design and screen-printed glass front.
• The IP6M insert, blending classic looks with top-tier performance.
• The MP 973 TH insert, compact and powerful, perfect for small hearths.

Whichever model you choose, you’ll benefit from Clean Protect technology, which improves combustion, reduces emissions, and keeps the glass cleaner for longer.

Seguin pellet inserts: smart, eco-friendly heating

Want a heating solution that’s easier and faster to use than a log fire? SEGUIN’s next-gen pellet inserts are for you. Ultra-efficient (up to 94%), they can be controlled remotely via smartphone and programmed for daily use.

Best-selling models include:

• The IP7 insert: Ultra-compact and stylish, ideal for narrow fireplaces.
• The IP9 insert: Powerful and smart, with a 40 kg tank and up to 50h autonomy.
• The IP11 insert: Combining ease of use with top performance.

Quiet and low-maintenance, SEGUIN’s pellet inserts are a perfect way to modernize your old fireplace with minimal effort. And their low environmental impact is a real plus!

Seguin dual-fuel inserts: The best of both worlds

Can’t decide between logs and pellets? Seguin has created dual-fuel 2-in-1 inserts, allowing you to switch between combustion types in seconds. One example is the Multivision insert, offering a 180° panoramic fire view and up to 95% efficiency in pellet mode.

With Seguin’s dual-fuel inserts, choose your energy based on your mood: Cozy log fires for evenings with friends, quick pellet heating for everyday comfort. All in one high-performance unit that brings out the unique character of your heritage fireplace.

Want to learn more about our insert solutions for old fireplaces? Use our online simulator to estimate the required power and get a first project estimate. Then book an appointment with one of our approved Seguin dealers: They’ll assess your fireplace and guide you to the best appliance for your needs and budget. With SEGUIN, modernizing your fireplace while preserving its charm has never been easier!