The Onyx Athos 5 Wide offers a broader firebox and versatile multi-fuel capability while maintaining the classic lines of the Athos range. With a nominal heat output of 5kW and a heat range of 2.5–7kW, it provides excellent heating for medium and larger rooms. The wider viewing window enhances the flame picture, creating a commanding and elegant centrepiece.

Designed with a fixed grate for occasional smokeless fuel burning, the Athos 5 Wide delivers up to 79.5% efficiency, alongside ECODesign compliance and DEFRA Smoke Control Area exemption. Built from robust cast iron and heavy-gauge steel and supported by Cleanburn and Airwash systems, it ensures durability and consistently clean, bright flames.

Key Features of the Onyx Athos 5 Wide Multi-Fuel Stove 

• Nominal heat output 5kW

• Heat range 2.5kW–7kW

• Efficiency up to 79.5%, A/A+ rating

• Wider fire chamber with fixed grate

• Burns wood & occasional smokeless fuel

• ECODesign compliant

• DEFRA exempt

• Cleanburn & Airwash technology

• Convector heat system

• 128mm (5”) top or rear flue

• External air compatible

• 12mm hearth compatible

• Traditional aesthetic

• Black knurled handle with champagne accents

• Cast iron & heavy-gauge steel construction

With its wider firebox and flexible multi-fuel capability, the Onyx Athos 5 Wide delivers striking flame views, powerful heating and clean, modern combustion technology.