Kratki – NBU11 3 sided Fireplace



Heat output: 14kW
Heating Capacity: 235 – 390m3
Strength of materials: Steel with highly refractory ceramic Acumotte
Weight: 299kg
Efficiency: 83%
CO Emissions: 0.09%
Flue pipe diameter: 200mm
Dimensions WxDxH: 578 x 1050 x 1471

The price shown is the unit price. Please contact us for a installation quotation.

Click on below links for technical drawing, product card and user guidelines:

Technical drawing

Product Card

Kratki User Guidelines



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The Kratki – NBU11 3 sided Fireplace is part of the built-in fireplace range. Kratki manufactures this three-sided, steel unit with 4mm thick steel and lines the combustion chamber with a highly refractory Acumotte ceramic. With its modern aesthetic, including a minimalist frame and blackened glass edges, the NBU 11 is the highlight of any space. This built-in fireplace offers great technical specifications and exceptional functionality while guaranteeing efficient heating and ecological wood combustion.

The NBU 11 is an impressive 3-sided fireplace with rise-and-fall glass door. This large glass door offers an amazing view of the fire in addition to being luxurious, modern and refined , this fireplace will become the centre piece of any space.


The Kratki steel firebox range pairs sleek and contemporary design with the most modern technology in fireplace combustion. Each unit boasts a sizeable glass window that provides a beautiful view of the flames once lit. For improved safety and performance, as well as an increased lifespan, the heat-resistant glass that Kratki uses is of the highest quality. The air-wash glass cleaning system greatly reduces the soot deposits on the fireplace glass.

Kratki’s manufactures it’s built-in steel range with thick, high-quality steel, most importantly Kratki built fireplaces to last Poland’s harsh winters.

Kratki lines the burn chamber with their signature ceramics. The thick, heat-intensifying ceramics offer the best thermal properties available.
This closed-combustion fireplace is an excellent heating solution for anyone looking for a high-performance, modern, built-in unit.

The range provides primary and secondary combustion. By utilising both natural convection and radiant heating technology, these units offer a cleaner burn and the maximum heat output. Most units in this range also come with tertiary combustion. The Steel fireplace is an efficient, closed-combustion fireplace therefor most of the heat generated by the burning wood is released more effectively into the room for your comfort.

All Kratki’s wood-burning fireplaces come with a 5-year warranty. Kratki designed your fireplace with strength and durability.

When cleaning your Kratki – NBU11 3 sided Fireplace glass we recommend you use the Ribitech Glass Cleaning spray.