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Onyx Avanti 85 Conventional Flue Gas Fire

The larger, Avanti 85 model boasts an impressive maximum heat output of 5.4kW making it ideal for keeping you warm and cosy whilst providing a truly spectacular flame set behind a non-reflective glass window. State-of-the-art operation using the fires multi-functional remote control for instant heat and ambiance!

£3,325.00(Inc. 20% VAT)+ FREE mainland UK delivery
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At a glance...

Freestanding Stove
Heat Output
5.1kW to 6kW
Flue Compatibility
Class 1 or Class 2
Product Information

Onyx Live 3 Stove 5 Year WarrantyWhether 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.

The Onyx Avanti 85 Conventional Flue Gas Fire, a masterpiece of modern design and cutting-edge technology that redefines the concept of luxury heating. Crafted with meticulous attention to detail, this elegant gas fire combines sleek aesthetics with unparalleled performance to elevate any living space. The Onyx Avanti 85 boasts a striking presence, with its expansive viewing area framed by clean lines and a contemporary finish, making it the focal point of any room.

Beyond its captivating appearance, the Onyx Avanti 85 delivers exceptional heating performance, providing both warmth and ambiance to enhance your home environment. With a powerful heat output and customisable flame settings, you can create the perfect atmosphere for any occasion, whether it's a cosy night in with loved ones or a sophisticated gathering with friends.

Experience the epitome of luxury heating with the Onyx Avanti 85 Conventional Flue Gas Fire—a true masterpiece that combines form, function, and innovation to create an unparalleled heating experience for your home.

Onyx Liv 3 Remote ControlComplete 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

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.

Oynx Avanti 85 Conventional Flue Gas Fire Sizes


Please note: Due to rising freight charges, we are now being forced to charge extra for delivery to certain Scottish 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.

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