The Stûv 21/125 SF Single Faced Inset Wood Burning Stove is the widest single-sided model in the Stûv 21 range, designed for customers who want a large architectural wood fire with retractable glass and significant heating performance. It offers the broadest single-faced flame view in the family and is intended for statement fireplace installations.
The retractable glass allows the fire to work in two ways. When raised, it creates an open-fire experience. When lowered, it becomes a high-efficiency closed stove with strong safety and combustion control. The wide firebox and large viewing area make it especially effective in larger interiors where a smaller model may feel visually under-scaled. Like the other Stûv 21 fires, the door tilts forward for easier cleaning and maintenance.
In performance terms, the 21/125 SF offers a rated output of 25.6 kW, an optimal range of 11.4 to 28.9 kW, 76.3% efficiency at rated power and an energy efficiency class of A. It accepts 100 cm logs, weighs 305 kg, and uses a 300 mm flue outlet. It is compatible with outside air connection and a wide selection of claddings, facades and ready-to-fit fireplace options.
Key Features:
- Single faced inset wood burning stove
- Retractable glass
- Open or closed fire use
- Extra-wide architectural fire view
- Rated output 25.6 kW
- Operating range 11.4 to 28.9 kW
- 76.3% efficiency
- Energy efficiency class A
- Accepts logs up to 100 cm
- Outside air connection
- Optional barbecue
- Optional claddings and facades
Expert Insight
The 21/125 SF is the right model where a broad panoramic single-sided fire is required. Its large log capacity and strong rated output make it much better suited to large feature walls and bigger living areas than the narrower models.
Suitability
The Stûv 21/125 SF Single Faced Inset Wood Burning Stove is well suited to large living rooms, architectural feature walls and interiors where a very wide single-sided built-in fire is wanted.
Installation / Technical Notes
This model weighs 305 kg, accepts 100 cm logs, uses a 300 mm flue, and requires a minimum combustion air section of 200 cm². Minimum insulation thickness is 11 cm at the back, 15 cm at the sides, 0 cm above and 10 cm below.
Frames, Claddings And Front Panel Examples:
Front Panel Colour Options
19 heat resistant powder coated front panel colours to choose from including a rust option.















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