Original firebricks for Defro DS 20 and DS II 25 kW boilers – optionally as individual units Primary stone, individual Secondary stone or as complete set With both stones. Optimal fit – ideal for repair, replacement or maintenance.

Highlights & Advantages

⭐ Original Defro replacement firebrick – high heat resistance and long service life
⭐ Suitable for Defro DS 20 kW and DS II 25 kW boilers
⭐ Individual purchase possible: Primary stone or secondary stone separately
⭐ Complete Set with primary & Secondary stone available
⭐ Perfect heat conduction in the combustion chamber – for efficient operation

Product description

The Defro fireclay brick is a high-quality, heat-resistant ceramic brick for the combustion chamber of classic solid fuel and wood gasification boilers of the following types DS 20 kW and DS II 25 kW from DEFRO. It ensures consistent flame control and high thermal safety during boiler operation.

What makes this product particularly flexible:
✔ You can only the primary stone order – e.g., when the flame guide is worn out.
✔ You can only the secondary stone Order now – ideal for damage in the area of ​​secondary air openings.
✔ Or you can choose that complete set Made from both stones – perfect for a complete renovation in one go.

💡 Primary stone: Fireclay brick flame guide – responsible for the primary combustion air supply in the boiler.
💡 Secondary stone: Two-part fireclay brick with openings for secondary air supply – supports residual combustion.

Variants & Selection

• Primary stone – individually

• Secondary stone – single (consisting of two half-shells)

• Set – Primary & Secondary stone – complete firebrick package

Technical specifications (according to product information)

Mission & Application

The firebricks serve as wear and tear protection and functional protection in the combustion chamber of your boiler. They ensure:
✅ higher thermal stability in the combustion chamber
✅ more even heat distribution
✅ optimized fuel consumption
Replacing individual stones extends the lifespan of your boiler and avoids unnecessary repair costs.

Ordering tip

Choose the variant when purchasing Primary, Secondary or set, Depending on your needs – that way you get exactly what you currently require.