
The Onyx Avanti 85 Balanced Flue Gas Fire represents the height of innovation, craftsmanship, and modern design within the Avanti collection. Created by the Stovax Heating Group, pioneers with over four decades of expertise in premium heating, the Avanti 85 delivers breathtaking realism, effortless control, and outstanding energy efficiency. Its commanding 85cm landscape design offers a stunning centrepiece for any contemporary home, combining exceptional warmth with exquisite visual appeal.
A Striking Centrepiece for Modern Interiors
With its expansive panoramic format, the Avanti 85 transforms any room into a luxurious living space. Designed to be installed as a sleek hole-in-the-wall fire, or paired with a bespoke fireplace surround, it offers remarkable versatility for a range of interiors. Choose between the minimalist Edge+ frame, the bold Expression frame, or opt for a frameless Edge installation for seamless architectural integration. The result is an elegant, modern statement piece that radiates both warmth and sophistication.
Unrivalled Flame Realism
At the heart of the Avanti 85 is a state-of-the-art burner system engineered for authenticity. Hand painted split oak logs rest upon a glowing ember bed, producing an immersive, natural flame picture that mimics a true wood burning fire. The addition of EchoFlame™ Black Glass enhances this effect, reflecting and multiplying the flickering flames within the firebox to create a deep, three-dimensional display that captivates from every angle.
Exceptional Heating Power & Efficiency
Beyond its beauty, the Avanti 85 excels in performance. With a 6.1kW heat output and an impressive 91.9% efficiency rating, it delivers both luxury and practicality in one remarkable package. This makes it ideal for larger living spaces and open plan areas, ensuring consistent, comfortable warmth while maintaining low running costs. It’s a fire that performs as brilliantly as it looks.
Effortless Operation & Intelligent Control
Every Avanti 85 comes equipped with a fully sequential thermostatic remote control, allowing you to manage every function from the comfort of your seat. From automatic ignition and flame height adjustment to room temperature regulation, the remote puts complete control at your fingertips. Its intelligent thermostat ensures consistent comfort, automatically maintaining your preferred temperature with precision.
Flexible Balanced Flue Installation
Perfect for homes without a chimney, the Avanti 85 uses a balanced flue system that draws air from outside and safely expels combustion gases. This not only improves efficiency but also enhances installation flexibility. Choose from:
- Top Exit “Up & Out” kit – ideal for walls facing outdoors.
- Top Exit Vertical kit – perfect for single storey homes or extensions.
- Optional Chimney Renovation Kit – allowing installation into an existing masonry chimney.
This adaptability ensures the Avanti 85 can be beautifully integrated into almost any property layout.

Designed for Easy Installation & Servicing
Engineered with precision and practicality, the Avanti 85 simplifies both installation and maintenance. Its compact control system integrates the valve and receiver unit for quicker setup, while the direct frame attachment system allows for cleaner fitting with minimal plasterwork. Ergonomic glass handles provide safe, straightforward access to the non-reflective glass panel, streamlining routine servicing and ensuring lasting performance.
Built to Endure
Constructed from premium materials and finished to the highest standards, the Avanti 85 promises enduring quality. The non reflective glass ensures a crystal clear view of the flames, free from unwanted glare. Backed by a 10 year extended warranty (upon registration), it offers complete peace of mind that your investment is protected for years to come.
Key Features & Benefits
- Premium 85cm balanced flue gas fire – largest in the Avanti collection
- Panoramic design for striking visual presence
- Hand painted split oak logs with glowing ember bed
- EchoFlame™ Black Glass for amplified realism
- Up to 6.1kW powerful heat output
- Exceptional 91.9% energy efficiency
- Non reflective glass as standard
- Fully sequential thermostatic remote control
- Flexible installation with multiple flue kits
- Simplified maintenance with ergonomic glass access
- 10 year extended warranty for lasting assurance
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