Biofires.com

ONYX Black Bioethanol Fireplace

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£395.00 GBP

~~£535.00 GBP~~ £395.00 GBP

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This modern piece with a beautifully smooth black graphite finish can be easily mounted on the wall using screws or recessed. Regulate the burning time (3-5 hrs) and heat output (1-3kW) with a fully regulating lid. It features our dedicated Fragrance Diffuser making the Small Container bioethanol fuel box compatible with our Aura Fragrance Oils.

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ONYX Black Bioethanol Fireplace is a beautiful wall-mounted bioethanol fireplace. It comes in a smooth black graphite finish. It is very easy to use and it can also be mounted straight on the wall (using screws provided) or recessed.

The frame is made of painted and powder coated steel. However, this flawless pearl-matt finish fireplace is also available in cream colour.

Moreover, it includes our standard Container Small (1.3L) bioethanol fuel burner and its lid features our special Fragrance Diffuser. Therefore the fireplace is compatible with our Aura Oil.

Finally, by sliding the lid across slightly, you can regulate the size of the flame (fluctuating between 10-25cm). Hence, you can also regulate the heat output (1-3kW) and the burning time – between 3-5hrs.

In the box of the ONYX Black Bioethanol Fireplace:

Screws for mounting
A funnel for filling up with the bioethanol fuel
Instructions
An extinguishing tool
A lid featuring Fragrance Diffuser

Note: If your wall is not fireproof you must line it with a layer of metal or fireproof cement and optional fireproof paint or similar fireproofing material.

Technical Info

Dimensions:
W 840mm
H 725mm
D 150mm
Burner capacity: 1.3 L
Weight: approx. 15kg
Burning time per refill: 3-5 hrs (depending on the size of the opening); flame height adjustable.
Heat output guidance: 1-3 kW (This is more than most electric fires and comparable to many flueless gas fires or regular gas fires, as with gas, there is 60% heat loss through the chimney. Bio Fires are 100% efficient – all heat produced stays in the room.
Fuel suitable: Bioethanol Fuel (maximum ethanol content: 96%). NOTE: Gel fuel is NOT suitable.

Delivery

When in stock, delivery within approx. 2-5 working days.

However, it requires an address where someone is available to sign all day.

Free Delivery promotion: please note that the delivery is only free to UK mainland (go to our DELIVERY section for postcodes which qualify for a delivery supplement).

Video

Downloads

Onyx - Size Drawing

Guidance technical drawing showing size and demonstrating two ways of mounting the fire.

You must buy from this company !!!!!

Wow is the first thing that comes to mind! From start to finish this company is excellent and you will not be disappointed. The staff give excellent service and are happy to answer any questions that you may have. We ordered the Onxy black fire after looking at your website for several weeks and within two days the fire was delivered on the day you said it would. We had an e-mail the day before to say it was on its way and then on the day itself we had another one to say it would be there within the hour... It arrived five minutes after receiving the e-mail. You kindly delivered it to my parents address and my dad was already impressed with the way it was professionally packaged and I think he was more excited than me to open it up the following day and put it up for us. The fire gives off more heat than expected. We even had to turn the heating off after 30 mins as it heated up the whole of our bungalow and burned for 6.5 hours in one session. buy from here if you want a great fire!!!

Love them want one in every room!

Love this! When I moved into my house the chimney was already capped off and the fireplace filled in and removed. I really didn't want the thousands of £ spend to reopen it and also to be burning wood which we know is bad for the environment. Then I came across biofires thought it was worth a go and it most certainly was! Hang it on the wall like a picture (getting the screws right is a little tricky) then fill up and light! My room is a high ceiling, victorian room with single glazing around 3m x 4m and it heats the room in about 20 mins to the point the dog is panting because he's too warm! It finishes the room and I'm absolutely in love with it

Just what we wanted

You fire is just what we needed although expensive to run If we purchased your ethanol it would cost £6 50/ hour
Better to buy an electric fire

Great Alternative to Gas Fire

Although mounting it was a bit more painful than the original instructions provided, the simplicity and the aesthetics is very nice and much more advanced than the electric ones we looked at!

Let customers speak for us

from 2937 reviews

Nice little heater/fire

Nice little heater/fire. Customer relations excellent, wrong colour sent, immediately replacement sent. Lovely web site. I cant fault them at all.

Stephen Jones

SORRENTO White Bioethanol tabletop fireplace

12/01/2025

Great product

Great product
Easy to use
No concerns
Highly recommend

Nik B

Crystal Premium Bioethanol Fuel

11/29/2025

Burns nicely

Burns nicely.

Anonymous

11/28/2025

I totally love

I totally love it

EILEEN KENNEDY

CYLINDER Black Modern XL Bioethanol Stove

Amazing fire and adjustable ceiling stove pipe

Amazing fire and adjustable ceiling stove pipe. Very happy with the fire.

Adjustable Ceiling Stove Pipe

11/25/2025

Simple and effective

Simple and effective. Tease out the fibre glow for authentic looking flame

Fibre Glow

11/23/2025

Great service and beautiful

Great service and beautiful fire

3x Fibre Glow

The fibre glow makes all the difference to the authenticity and warmth of the fire glow

The fibre glow makes all the difference to the authenticity and warmth of the fire glow.

Lexham is Lovely!

We have been looking at Bioehthanol fires for sometime now, and honestly the product has not disappointed! It was really simple to set up, and before sit we knew ot we were sitting back and enjoying!
Not only does it look amazing, the heat output is surprisingly high, making our lounge super cosy.

Hw hghly recommend Biofires as the product we have was packaged v well and delivered v quickly too.

The Deveys

Biofires.com (Gel Fireplaces LTD)

11/21/2025

Contemporary stove for my new Eco Home.

I was looking for something contemporary for my new Eco Home rather than a traditional wood burning stove. The Saturn fits the bill perfectly, and its heat output is exactly what I need. Happy.

S R Clack

Saturn Flame Bioethanol Fireplace

11/18/2025

festive

Son said it smells like Christmas!

Vero

Aura No.3 – Winter Cinnamon Spice Fragrance Oil

Stylish heat

Product as described. Delivery & comms spot on.

GLOBE Black Bioethanol Fireplace

Excellent product makes the fire more attractive

Excellent product makes the fire more attractive to look at

Keith Sandham

Great product look amazing

Great product look amazing 🤩

Caroline Hobbs

Black Pebbles 24 pieces

11/17/2025

Authentic glow

Gives a beautiful golden glow

Mary Fox

11/15/2025

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ONYX Black Bioethanol Fireplace