Description
Liv 3 Gas Stoves
Onyx Liv 3 gas stoves combine a sophisticated cylindrical design with stunningly realistic flames and log effects. Adding poise and allure to any interior, these elegant gas stoves can create an unmistakably contemporary centrepiece in your home.
Inspired Design. Innovative Engineering.
Onyx Liv 3 gas stoves combine a sophisticated cylindrical design with stunningly realistic flames and log effects. Adding poise and allure to any interior, these elegant gas stoves can create an unmistakably contemporary centrepiece in your home.
Complete Range Overview
The Onyx Liv 3 range offers both Balanced Flue and Conventional Flue options, available in Natural Gas or LPG configurations. Each model features the same stunning cylindrical design with 180° panoramic flame visuals and EchoFlame Black Glass lining.
| Model Option | Heat Output | Efficiency | Energy Class |
|---|---|---|---|
| Liv 3 Balanced Flue (BF) – NG/LPG | 4.5kW (2.6 – 4.5kW) | 94.3% | A |
| Liv 3 Conventional Flue (CF) – NG/LPG | 4.1kW (2.1 – 4.1kW) | 78.0% | D |
Liv 3 Gas Stoves Features
- Heat output range: 2.1kW – 4.5kW across the range
- Energy Efficiency Class: Balanced Flue A / Conventional Flue D
- High Efficiency: Balanced Flue 94.3% / Conventional Flue 78.0%
- Natural Gas and LPG options available
- Fully-sequential thermostatic Remote Control
- EchoFlame Black Glass lining for enhanced visual depth
- Conventional and balanced flue models
- Optional linerless flue kit (Conventional Flue only)
Stunning 180° flame visuals
Beyond the sweeping curves and clean lines of this remarkable gas stove, front and side glass panels showcase the Onyx Liv 3’s panoramic flames, providing 180° views for maximum visibility. Inside, life-like flame burner technology creates a tall, lazy fire which dances through highly realistic log effect fuel bed.
EchoFlame™ Black glass lining
Within the Onyx Liv 3, the three-sided flame visuals are further enhanced by EchoFlame™ Black Glass lining, which provides a mirror polished backdrop to reflect the tall rolling flames, lending additional visual depth and definition.
Conventional and Balanced Flue options
Conventional flue and balanced flue options mean that Onyx Liv 3 gas stoves can be installed with or without a chimney. For masonry chimney installations, the conventional flue Liv 3 can be fitted with our linerless flue kit instead of a full chimney liner, facilitating a simpler and more cost-effective installation.
Complete Control
All Onyx Liv 3 gas stoves feature a fully integrated control system, putting ignition, flame adjustment, heat output and extinguishing all in the palm of your hand. This powerful handset also lets you set the Liv 3 to thermostatically maintain your desired room temperature.
Designed and engineered in Britain
As part of the Stovax Heating Group, all Onyx stoves and fires are born in our state-of-the-art research and development laboratories. Every Onyx Liv 3 incorporates industry leading technology and design, and these premium gas stoves are the culmination of over 40 years of experience designing and crafting best-in-class heating products. By choosing the Onyx Liv 3, you can be sure you’re getting a premium quality gas stove that’s backed up by a network of retailers across the UK.
Key Facts
| Specification | Balanced Flue (BF) | Conventional Flue (CF) |
|---|---|---|
| Brand | Onyx | Onyx |
| Nominal Heat Output | 4.5kW (2.6 – 4.5kW) | 4.1kW (2.1 – 4.1kW) |
| Maximum Efficiency | 94.3% | 78.0% |
| Energy Efficiency Class | A | D |
| EchoFlame Black Glass | ✓ | ✓ |
| Thermostatic Remote Control | ✓ | ✓ |
| Natural Gas & LPG compatible | ✓ | ✓ |
| Linerless flue kit option | – | ✓ |
| Oxygen Depletion Sensor (ODS) | – | ✓ |
Specifications
| Specification | Value |
|---|---|
| Width (mm) | 430 |
| Height (mm) | 673 |
| Depth (mm) | 357 |
| Weight (kg) | 65 |
| Balanced Flue Outlet Size | 100mm |
| Balanced Flue Inlet Size | 150mm |
| Conventional Flue Outlet Size | 127mm (5 inches) |
| Gas Inlet Connection | 8mm |
Technical Dimension Matrix

| Model | Width (mm) | Height (mm) | Depth (mm) | Weight (kg) |
|---|---|---|---|---|
| Liv 3 Balanced Flue (BF) | 430 | 673 | 357 | 65 |
| Liv 3 Conventional Flue (CF) | 430 | 673 | 357 | 65 |
*All dimensions in mm. Weight is approximate. Please contact retailer for exact specifications.
**Balanced Flue models achieve 94.3% efficiency and A rating. Conventional Flue models achieve 78.0% efficiency and D rating.
†Linerless flue kit available for Conventional Flue models only.






