Kratki NBU 11 3-Sided Wood Fireplace

The Kratki NBU 11 is a large, built-in 3-sided wood-burning fireplace designed to provide an impressive view of the flames from multiple angles.

Its three-sided glass design makes the fire a strong architectural feature, while the large rise-and-fall glass door gives the fireplace a clean, modern appearance.

The NBU 11 has an 11kW nominal heat output, with a heating range of 4.5–14kW. Kratki’s current manufacturer specification lists thermal efficiency at 83%.

3-Sided Fireplace with a Panoramic Fire View

The main feature of the Kratki NBU 11 is its three-sided glass design.

Glass across the front and sides allows the flames to be viewed from different positions within the room. This makes the NBU 11 particularly suited to open-plan living areas and contemporary interiors where the fireplace can be enjoyed from more than one viewpoint.

The NBU 11 is an impressive 3-sided fireplace with a large rise-and-fall glass door and a wide view of the fire.

11kW Nominal Heat Output

The Kratki NBU 11 has an 11kW nominal output and a 4.5–14kW heating range according to Kratki’s current manufacturer documentation.

This Kratki 3-sided wood-burning fireplace has a heating capacity of approximately 220–325m³. The actual heating performance of any fireplace depends on factors such as room size, insulation, ceiling height and building construction.

This makes the NBU 11 a substantial wood-burning fireplace for larger residential living spaces.

Large Rise-and-Fall Glass Door

The NBU 11 features a rise-and-fall glass door, also known as a guillotine door.

The door lifts upwards to provide access to the firebox when loading wood. When closed, the large glass area provides an unobstructed view of the flames.

Kratki also uses an air-wash system across its wood-burning fireplace range to help reduce soot deposits on the glass.

Heat-Intensifying Ceramic Lining

The combustion chamber is lined with Kratki’s heat-intensifying ceramic material.

The ceramic lining is designed to retain heat within the combustion chamber and support the combustion process. The NBU 11 also has a ceramic drop-in base that provides additional space for burning wood coals.

Efficient Closed-Combustion Fireplace

The NBU 11 is a closed-combustion wood fireplace.

Kratki’s specifications list primary, secondary and tertiary combustion, which help manage the combustion process and improve the use of heat produced by the burning wood.

The manufacturer specification lists the NBU 11 with an 83% thermal efficiency and A+ energy class.

External Combustion Air

The NBU 11 can be connected to an external air supply. This allows combustion air to be supplied from outside the room, subject to the installation design and applicable requirements.

Steel Construction

The NBU 11 is manufactured from steel and has a substantial construction designed for high-temperature wood burning.

The South African specification lists the fireplace at approximately 299kg, with dimensions of approximately 52 × 105 × 147.1cm. It uses a 200mm flue connection and has a reversible cast-iron top flue spigot.

Kratki NBU 11 Specifications

• Fireplace type: Built-in 3-sided wood-burning fireplace
• Nominal heat output: 11kW
• Heating range: 4.5–14kW
• Thermal efficiency: 83%
• Energy class: A+
• Heating capacity: Approximately 220–325m³
• Fuel: Wood
• Glazing: Three-sided
• Door: Rise-and-fall glass door
• Maximum log length: 500mm
• Flue diameter: 200mm
• Material: Steel
• Weight: Approximately 299kg
• Dimensions: Approximately 52 × 105 × 147.1cm
• Combustion technology: Primary, secondary and tertiary combustion
• Ash pan: Yes
• Country of manufacture: Poland
• Warranty: 10 years

A Statement Fireplace for Modern Interiors

The Kratki NBU 11 3-sided fireplace combines a large firebox with three-sided glazing and a modern built-in design.

The three-sided configuration allows the flames to become a visible feature from different parts of the room. Its large glass door and clean steel construction suit contemporary residential interiors.

With an 11kW nominal output and heating range up to 14kW, the NBU 11 offers substantial wood-burning heat while maintaining a strong architectural presence.

Professional Fireplace Installation

A built-in 3-sided fireplace requires careful planning for the fireplace opening, flue, combustion air, ventilation and surrounding construction.

Italfire has an in-house installation team and installs fireplaces supplied by Italfire. We recommend using Italfire for the installation to help ensure that the fireplace is installed correctly and according to the manufacturer’s requirements.

Contact Italfire to discuss the Kratki NBU 11, installation requirements and whether this 3-sided wood fireplace is suitable for your home.

All Kratki’s wood-burning fireplaces come with a 10-year warranty. Kratki designed your fireplace with strength and durability.