Whether you're wanting to give your room a stylish, 'hole-in-the-wall' style feature with the fire fitted raised up in the wall or you're looking for a modern centrepiece to build into a custom fireplace surround, the incredible Onyx Avanti 85 conventional flue gas fire is definitely one to consider!
This designer gas fire can be combined within a fireplace with a custom back panel opening to create a unique frameless feature without a outer frame. Alternatively, the Onyx Avanti 85 gas fire can be supplied with a Edge+ trim for a minimalist 'hole-in-the-wall' feature where the flames take centre stage or with the larger Expression fascia which frames the fire beautifully!
A powerful gas fire that is suitable for installation into a Class 1 flue (real chimney) or 5" pre-fabricated flues subject to adequate depth being available to accommodate the fires depth. Enjoy a wonderful view of the mesmerising flames dancing around the hand-painted, split oak effect fuel bed through the special, non-reflective glass front.
The Onyx Avanti Gas fire range is designed with elegance in mind. With their sleek exteriors, these luxurious inset feature fires complement all manner of contemporary interior styles, creating a breathtaking centrepiece.
With many ergonomic features, Avanti Gas fires are designed for an optimised installation and servicing experience. These conventional flue fires are available as natural gas and LPG models and come in two sizes, the Avanti 65 and the larger 85.
The Avanti Gas range exhibits alluring EchoFlame™ Black Glass Lining, which offers a reflective backdrop for mesmerising layered flame visuals. Combining the mystique of this feature with an ultra-realistic, handpainted Split Oak log-effect, these premium fires drive at picture-perfect quality.
Make a truly exceptional statement with the bold Expression frame, or opt for effortless sophistication with the minimalist Edge+. The Avanti Gas burner system creates a glowing ember-effect bed and wrap-around, rolling flames placed in thoughtful points around the log-effects, mirroring a traditional woodburning fire.
This is enhanced by our alluring EchoFlame™ Black Glass Lining, a reflective backdrop creating mesmerising layered flame visuals. Combining these features with an ultra-realistic, handpainted Split Oak log-effect, these premium fires drive at picture-perfect quality.
Complete Control
All Onyx Avanti Gas Fires feature a compact, fully integrated control system, putting ignition, flame adjustment, heat output and extinguishing right into the palm of your hand. The included remote handset also offers thermostatic control, so your Avanti can keep the room at the temperature you desire.
Onyx. experience the exceptional.
As part of the Stovax Heating Group, all Onyx stoves and fires are born in their state-of–the-art research and development laboratories. Every Onyx Avanti incorporates industry leading technology and design, and these premium gas fires are the culmination of over 40 years of experience designing and crafting best-in-class heating products. By choosing the Onyx Avanti, you can be sure you’re getting a premium quality gas fire that’s backed up by a network of retailers across the UK.
Onyx Avanti 85 Conventional Flue Gas Fire Features
- Heat output: Up to 5.4kW heat output
- High Efficiency: 77.9%
- Energy Efficiency Class: D
- Fully Sequential Thermostatic Remote Control
- EchoFlame™ Black Glass Lining
- Hand-painted Split Oak Log-effect
- Choice of Frame Options
- Top and Rear Flue Exit
- Natural Gas and LPG Models

Download Instructions
(Manufacturers instructions are offered as a guide only and may not always be the latest version)
Key features of the Onyx Avanti 85 Conventional Flue Gas Fire can be found below.
Fuel | Natural Gas or LPG |
Heat Output | 4.9kW - 5.4kW |
Efficiency | 77.9% |
Flue Outlet | Top or Rear |
Colour/Finish | Black |
Fuel Effect | Logs |
Control | Multi-Functional Remote Control |
Warranty | 5 Years (extended warranty) |
The dimensions (width, height, depth) of the Onyx Avanti 85 Conventional Flue Gas Fire are listed here.

Please note: Due to rising freight charges, we are now being forced to charge extra for delivery to Highland postcodes.
Due to the size and weight of this model, the Onyx Avanti 65 Conventional Flue Gas Fire will be delivered to you on a palletised delivery service. All pallet deliveries are kerbside/front door delivery only, so please arrange adequate means to take your order into your home. Under normal circumstances this may take 2 people.
Current delivery times for the Avanti 65 is approximately 7 days however, this is dependant on stock levels at time of placing an order. Once an order is placed, we will contact you to advise if there is likely to be any delays on the estimated delivery time.
Returns information
We understand that from time to time some of our customers may change their mind or simply not be pleased with their chosen products once delivered and/or installed. Our returns policy should hopefully help with the process of returning your order in this instance. Please feel free to contact us should you have any further queries.