Twin wall chimney systems

Insulated flue systems from Hot Box ®

What is a twin wall chimney system?

A twin wall chimney system is an insulated, double-walled flue designed for safely venting the exhaust gases from wood-burning stoves and other heating appliances. It consists of two stainless steel walls with insulation in between, which helps maintain high temperatures inside the flue, ensuring a strong draft while preventing condensation. This type of system is ideal for homes without an existing chimney, as it can be routed either through walls or roofs. Schiedel, the leading manufacturer of chimney systems, is renowned for producing high-quality twin wall chimneys, offering exceptional durability, advanced aesthetics, thermal efficiency, and safety. At Hot Box ®, we have used Schiedel twin wall chimney systems since our inception back in 2008.

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Flue through walls

A twin wall chimney system can be used to penetrate a wall from the top of an appliance.

Connect to the rear

Appliance with rear flue exists can be installed using a twin wall chimney system through a wall.

twin wall chimney through a conservatory

Through conservatory roofs

Twin wall chimney systems can be used to install wood burners in conservatories or extensions.

Chimney Sweep Access

When using a twin wall chimney, access for sweeping can be outside the property via a tee section.

Create the perfect look for your home fire

A wood burner wherever

When using a twin wall chimney system, so long as certain parameters for the termination point of the flue can be met, you can install a wood burner in most locations. Document J sets out the requirements for chimney terminations.

Distance to combustibles

Schiedel chimney systems, as used by Hot Box ® are certified as being safe so long as they re 60mm away from combustibles. Ideal for creating penetrations through walls with external timber, composite or other types of combustible cladding.

Warm Flue

Because a twin wall chimney system is insulated, it will warm up quickly and maintain its temperature even when it is external. Your appliance will be more efficient. Further, the provision for future maintenance such as chimney sweeping can be designed in.

Applications

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Schiedel twin wall chimney systems are ideal for use with wood-burning stoves in the following scenarios:

Homes without an Existing Chimney: For properties that lack a traditional brick chimney, Schiedel twin wall systems provide an efficient and safe alternative. They can be installed externally on the building’s side or routed through the interior, making them versatile for modern homes.
Chimney Upgrades or Extensions: For homes with outdated or damaged chimneys, Schiedel twin wall systems can be installed as an upgrade to improve safety and efficiency. They can also be used to extend existing chimneys when necessary.
New Build Homes: Schiedel twin wall systems are an excellent choice for new construction projects, offering a modern, efficient, and aesthetic solution for wood-burning stoves. Twin wall chimney systems will offer a more cost effective solution versus constructing a masonry class I chimney. Further, they are designed for this exact purpose so will perform better.
Outbuildings and Garden Rooms: As more people install wood-burning stoves in outbuildings, garages, or garden rooms, Schiedel twin wall chimneys provide the perfect solution for creating a safe and efficient flue system in these spaces.

Roof penetrations using twin wall

A range of solutions for any roof covering

At Hot Box ® we can provide effective roof penetrations using twin wall chimney systems for most types of roof. Relying on our heritage as roofing specialists, we can provide detailed for slate, zinc, lead and all types of roof coverings. A properly formed roof penetration is vital to the integrity of your building and stove installation. Our ultimate guide to roof penetrations using twin wall chimney systems provides further reading on this topic.

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Benefits

Safety: Schiedel twin wall systems are built to strict safety standards, ensuring that the chimney operates efficiently while protecting the home from the risks of fire or overheating. The outer wall remains cool to the touch, reducing the risk of accidental burns or damage to surrounding materials.
Efficiency: By maintaining optimal flue temperatures, Schiedel systems help wood-burning stoves burn more efficiently, reducing fuel consumption and improving heat output. The well-insulated design also prevents the build-up of creosote, improving the system’s overall safety.
Versatility: Whether for a new installation or a retrofit, Schiedel twin wall chimneys are suitable for a wide range of building types, layouts, and styles. They can be installed internally, passing through ceilings and roofs, or externally, running along exterior walls.
Low Maintenance: Thanks to the corrosion-resistant properties of stainless steel and the system’s ability to prevent creosote build-up, Schiedel chimneys require minimal maintenance. Regular sweeping and inspections are usually sufficient to keep the system in top condition.
Compliance: Fully certified and compliant with industry standards, Schiedel twin wall systems offer a high level of safety assurance, giving homeowners confidence in their installation.

Testimonials

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Attention to detail

After many years of using our traditional fireplace we decided to upgrade to a wood burning stove, we engaged Hot Box to supply & fit. We are so pleased we did.
From start to finish the service we received was excellent. The team were professional, showing attention to detail. The stove supplied is easy to use and maintain.
5 star service, we would highly recommend 👍

Steve Thompson (Google)

The Pleasure

I recently had the pleasure of working with a fantastic team from Hot box for the installation of woodburning stoves in my home. From start to finish, the experience was exemplary, and I couldn’t be happier with the result.

When it came to the fitting process, Chris and Lewis handled the installation with incredible professionalism and skill. Their teamwork and dedication were commendable. They worked efficiently and meticulously, ensuring that the stoves were fitted securely and with precision. Their expertise was evident in the final outcome, which not only met but exceeded my expectations.

Amanda Mountain (Google)

Immaculate

We had recess works and our stove refitted by 2 excellent fitters. The work was completed to a very high standard and the area was left immaculately clean. The communication was clear during the entire installation and to top it off the installers were great guys! Couldn’t praise them higher. Thank you!

Ben wilson (Google)

Construction | Features

Double-Wall Construction: Schiedel twin wall chimney systems consist of two layers of stainless steel, separated by a layer of high-grade insulation. This double-wall construction provides excellent thermal performance, ensuring that the outer wall stays cool while the inner wall effectively contains the high temperatures from wood-burning stoves. This makes it safe for installation in close proximity to combustible materials.
Durable Materials: The inner and outer walls are constructed from high-quality stainless steel, which is corrosion-resistant, ensuring a long lifespan even in harsh weather conditions or with frequent use. The stainless steel construction also prevents condensation and resists the corrosive effects of combustion gases, contributing to the longevity of the system.
Superior Insulation: The insulated gap between the inner and outer walls reduces heat loss and ensures the flue gases remain at optimal temperatures, promoting better draft and preventing the formation of creosote, which can cause chimney fires. The insulation also allows for more efficient burning and less waste, enhancing the performance of the wood-burning stove.
Modular System: Schiedel’s twin wall chimneys are modular in design, meaning they can be easily assembled and customized to suit a variety of installation scenarios. Whether running through internal walls, attics, or externally along the side of a building, the system offers a range of fittings and components, including adjustable lengths, elbows, and tees, making it flexible for different building types.

Easy Installation: Thanks to its modular design, the Schiedel twin wall system can be installed quickly and efficiently. The push-fit, twist-lock connection system ensures a secure and tight seal between sections, reducing the risk of leaks and improving the overall efficiency of the flue. Installation is hassle-free, requiring minimal disruption to the property.
Compliance and Safety: Schiedel twin wall chimneys are HETAS-approved and compliant with UK building regulations, ensuring they meet all safety standards for use with wood-burning stoves. The system provides peace of mind for homeowners by minimizing the risk of overheating or fire hazards during use.
Weatherproofing: Designed for both internal and external installations, the outer stainless steel layer is built to withstand the elements, ensuring long-term durability even when exposed to rain, snow, or wind. Schiedel systems also come with a range of weatherproofing accessories, such as cowls and flashings, to ensure the chimney system remains secure and operational in all weather conditions.
Aesthetic Flexibility: Available in a polished stainless steel finish or with powder-coated color options, Schiedel twin wall chimneys can be tailored to match the aesthetic of any home. This makes them an excellent choice for both modern and traditional properties.