Stuv 21 Inserts
The Stûv 21 range includes a choice of single sided and double sided inset wood burning fires, designed for built-in fireplace installations.
With a retractable glass window, the Stûv 21 can be enjoyed as an open fire or used as a closed wood burning stove for improved efficiency.
Its frameless design, clean lines and large fire opening make it ideal for modern interiors and architectural fireplace projects.
Available in a range of sizes, the Stûv 21 creates a powerful, elegant and highly visual centrepiece for your home.

Showing all 9 results
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- Single faced design
- Full retractable glass
- 19.8 kW output
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- Double sided fire
- Retractable glass sides
- 27.4 kW output
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- Single faced fire
- Retractable glass
- 25.6 kW output
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- Double sided fire
- Retractable glass both sides
- 18.0 kW output
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- Single faced design
- Retractable glass
- 13.7 kW output
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- Double sided fire
- Retractable glass both sides
- 22.6 kW output
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- Single faced design
- Retractable glass
- 16.1 kW output
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- Double sided fire
- Retractable glass both sides
- 27.1 kW output
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- Single faced fire
- Retractable glass
- 18.4 kW output
Showing all 9 results
The Stûv 21 collection is a premium range of built-in inset wood burning fires, designed for homeowners who want the atmosphere of an open fire with the performance of a modern closed appliance. With 8 models available, including 4 single sided and 4 double sided versions, the range offers flexible options for feature fireplaces, room dividers and contemporary chimney breast installations.
One of the key features of the Stûv 21 is its retractable glass window. When lowered, the appliance operates as an efficient closed wood burning stove, helping to improve heat control and combustion performance. When raised, it creates the feel of a true open fire, giving you a more traditional flame experience when desired.
The single sided Stûv 21 models are ideal for creating a clean, frameless fireplace feature against a wall or within a chimney breast. The double sided models are perfect for open-plan spaces, allowing the fire to be viewed from both sides and used as a striking divider between two living areas.
With its pure lines, concealed mechanisms and large fire opening, the Stûv 21 has a refined architectural look that works beautifully in modern homes, luxury interiors and bespoke fireplace projects. The generous glass area provides an impressive view of the flames, while the powerful heat output makes the range suitable for larger rooms and open living spaces.
Whether you are planning a new fireplace build, upgrading an existing opening or designing a double sided feature fire, the Stûv 21 offers a highly flexible and visually impressive solution. Bonfire can help you compare the full range, choose the correct size and advise on suitable installation requirements for your home.
Why Choose the Stûv 21 Range?
- 8 models available
- Single sided options
- Double sided options
- Built-in inset design
- Retractable glass window
- Open fire mode
- Closed stove mode
- Large flame viewing area
- Clean frameless styling
- Ideal for feature fireplaces
