Onyx Athos 5 Wood Burning Stove
The Onyx Athos 5 wood burning stove combines contemporary styling with the warmth and atmosphere of a real wood fire. Its large viewing window creates an attractive focal point, while the convector design helps distribute warmth around the room.
With a nominal heat output of 4.8kW and an output range of 2–6kW, the Athos 5 is designed to provide comfortable heat for a variety of living spaces. The right stove output depends on your room size, insulation and installation conditions, so we recommend discussing your requirements before choosing an appliance.
Cleanburn and Airwash Technology
Cleanburn technology supports efficient combustion, while the Airwash system helps keep the viewing glass clearer during use. These features help you enjoy the flame picture while operating the stove in accordance with the manufacturer’s instructions.
Heat Output and Efficiency
The Athos 5 has a nominal heat output of 4.8kW, with a 2–6kW range and a stated efficiency of up to 82%. Actual performance depends on installation, fuel quality and how the appliance is operated.
Smoke Control and Ecodesign
The Onyx Athos 5 is DEFRA approved for use in Smoke Control Areas and is Ecodesign compliant. Always burn suitable, properly seasoned wood and follow the manufacturer’s operating instructions and local requirements.
Flue and Installation Options
The stove has a 5-inch flue outlet with top or rear connection options. It is compatible with a 12mm hearth, and an optional external air kit is available where required.
Embers Heating Studio offers supply-only and installation options. Before ordering, the appliance and proposed installation should be checked against your property’s requirements, including the flue, hearth and ventilation arrangements.
Product Specifications
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Brand: Onyx
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Model: Athos 5
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Fire type: Wood-burning stove
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Nominal heat output: 4.8kW
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Heat output range: 2–6kW
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Efficiency: Up to 82%
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Flue outlet: 5-inch, top or rear
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Hearth: Compatible with a 12mm hearth
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External air: Optional kit available
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Smoke control: DEFRA approved
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Ecodesign: Compliant
Choosing the Right Stove for Your Home
The Onyx Athos 5 is one option in the Onyx stove collection. When choosing a stove, consider the size and layout of the room, the heat output required, and the type of fuel you intend to use. The flue route, hearth and ventilation requirements should also be checked before ordering.
If you’re considering the Athos 5 for your home, contact Embers Heating Studio in Derby. We can discuss the appliance, supply-only options and whether a suitable installation service is available for your property.
Warranty
The Onyx Athos 5 has a 10-year extended manufacturer’s warranty when purchased through an Onyx Expert Retailer and registered within one month of installation. Parts and labour are covered for the first two years, with parts-only cover for years three to ten. Consumables are covered for the first year. Terms and conditions apply.
For full details, visit the Onyx manufacturer warranty page.
Explore the Onyx Range
Discover more from Onyx Fires and Stoves, including contemporary electric fires and gas fires, alongside wood-burning and multi-fuel stoves.

















