How little does it cost to run an Onyx gas stove?

Liv 3 BF Nat Gas

Input: 5.3kW (high), 3.5kW (low)
Nominal Heat Output: 4.5kW
Remote Control Model
Maximum Efficiency: 94.3%†
Efficiency Class: A

27c

1 hour on low heat

40c

1 hour on high heat

€1.06

4 hours on low heat

€1.61

4 hours on high heat

*Based on Liv3 Balanced Flue Natural Gas model, running at 4 hours on low input of 3.5kW. Costs presented are based on the effective unit price of natural gas on a Bord Gáis Energy Fixed Rate Tariff, with a fixed unit price of 7.58c/kWh (Bord Gáis Energy; https://www.bordgaisenergy.ie/home/our-tariffs; Accessed 19/03/2026). Does not include any costs relating to product maintenance and servicing. Prices rounded to nearest whole cent.
†Maximum efficiency is achieved when running product on high output setting.

How little does it cost to run an Onyx gas fire?

Avanti Gas Fire♦

Input: 6.4kW (high), 3.6kW (low)
Nominal Heat Output: 4.5kW
Remote Control Model
Maximum Efficiency: 78.4%†
Efficiency Class: D

27c

1 hour on low continuous heating

49c

1 hour on high continuous heating

€1.09

4 hours on low continuous heating

€1.94

4 hours on high continuous heating

*Based on Avanti Gas 65 Conventional Flue Natural Gas model, running at 4 hours on low input of 3.6kW. Costs presented are based on the effective unit price of natural gas on a Bord Gáis Energy Fixed Rate Tariff, with a fixed unit price of 7.58c/kWh (Bord Gáis Energy; https://www.bordgaisenergy.ie/home/our-tariffs; Accessed 19/03/2026). Does not include any costs relating to product maintenance and servicing. Prices rounded to nearest whole cent.
†Maximum efficiency is achieved when running product on high output setting.
♦Based on Avanti Gas 65 Conventional Flue Natural Gas model.

How little does it cost to run an Onyx gas fire?

Eclipse Gas*

Input: 5.1kW (low), 7.3kW (high)
Nominal Heat Output: 5.1kW
Remote Control Model
Maximum Efficiency: 78%†
Efficiency Class: D

39c

1 hour on continuous heating

55c

1 hour on high continuous heating

€1.55

4 hours on low continuous heating

€2.21

4 hours on high continuous heating

*Based on Eclipse 60HL Conventional Flue Natural Gas model, running at 4 hours on low input of 5.1kW. The costs presented are based on the effective unit price of gas on a Bord Gáis Energy Fixed Rate Tariff, with a fixed unit price of 7.58c/kWh (Bord Gáis Energy; https://www.bordgaisenergy.ie/home/our-tariffs; Accessed 19/03/2026). Does not include any costs relating to product maintenance and servicing. Prices rounded to nearest whole cent.
†Maximum efficiency is achieved when running product on high output setting.

Why choose an Onyx stove or fire?

There are lots of fantastic reasons to choose an Onyx luxury gas or electric stove or fire for your home.

Over 40 Years of Expertise

As part of the Stovax Heating Group, Onyx represents the pinnacle of more than four decades of British design and engineering expertise. Every fire and stove is born in our state-of-the-art research and development laboratories, and incorporates industry leading technology and design.
Effortless Control

All of our stunning stoves and fires come with an intuitive remote handset for effortlessly controlling your Onyx stove or fire from the comfort of your armchair. What’s more, many of our electric fires are controllable with compatible iOS and Android smartphones via an innovative app.
Unparalleled Ambience

Many of our electric stoves and fires boast a plethora of different flame and lighting effect combinations, thanks to our advanced Chromalight® Immersive LED systems. When coupled with our authentic and lifelike log sets, Onyx electric fires deliver a truly unparalleled fireside ambience.
Highly Efficient

Onyx gas stoves and fires are designed to be as efficient as possible, with some offering up to a 94.3% efficiency rating. Likewise, our electric stoves and fires are designed with smart Ecodesign energy saving features such as Open Window Detection, to maximise energy efficiency.

How little does it cost to run an Onyx electric fire?

Avanti Electric Range†

Input: 1.0kW (low) - 2.0kW (high)
Output: 1.0kW (low) - 2.0kW (high)
      (depending on usage of heat & effects)
Enjoy with or without heat
Media Wall Compatible

5c

4 hours flame effect only

27c

1 hour on low heat

53c

1 hour on high heat

€1.12

4 hours on thermostatically maintained heat*

*Based on running the fire for 4 hours, with heat on for 50% duty cycle due to thermostatic control, and flame effects for the full duration. Costs presented are based on a fixed unit price of 26.00c/kWh for electricity on a Bord Gáis Energy Fixed Rate Electricity Tariff (https://www.bordgaisenergy.ie/home/our-tariffs; Accessed 19/03/2026). Does not include any costs relating to product maintenance and servicing. Prices rounded to nearest whole cent.
†Figures based on the Avanti Electric 110RW Fire

How little does it cost to run an Onyx electric fire?

Fusion 150RW Electric Fire

Input: 1.0kW (low) - 2.0kW (high)
Output: 1.0kW (low) - 2.0kW (high)
      (depending on usage of heat & effects)
Enjoy with or without heat
Media Wall Compatible

4c

4 hours flame effect only

27c

1 hour on low continuous heating

53c

1 hour on high continuous heating

€1.10

4 hours on thermostatically maintained heating*

*Based on running the fire for 4 hours, with heat on for 50% duty cycle due to thermostatic control, and flame effects for the full duration. Costs presented are based on a fixed unit price of 26.00c/kWh for electricity on a Bord Gáis Energy Fixed Rate Electricity Tariff (https://www.bordgaisenergy.ie/home/our-tariffs; Accessed 19/03/2026). Does not include any costs relating to product maintenance and servicing. Prices rounded to nearest whole cent.

How little does it cost to run an Onyx electric fire?

Orbit Electric Fire

Input: 0.75kW (low) - 1.5kW (high)
Output: 0.75kW (low) - 1.5kW (high)

      (depending on usage of heat & effects)
Enjoy with or without heat
Ceiling-hung fire

2c

4 hours flame effect only

20c

1 hour on low continuous heating

40c

1 hour on high continuous heating

81c

4 hours on thermostatically maintained heating*

*Based on running fire for 4 hours, with heat on for 50% duty cycle due to thermostatic control, and flame effects for the full duration. Costs presented are based on a fixed unit price of 26.00c/kWh for electricity on a Bord Gáis Energy Fixed Rate Electricity Tariff (https://www.bordgaisenergy.ie/home/our-tariffs; Accessed 19/03/2026). Does not include any costs relating to product maintenance and servicing. Prices rounded to nearest whole cent.

Onyx

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