Description

The Onyx Athos 5 Wide Multi-Fuel Stove is solid and well-built, with a steel body and cast iron door that look like they’ll last for years. The big glass window is great for watching the flames, and the Airwash system keeps it cleaner for longer, which is a relief when you just want to sit back and enjoy the fire.

This multi-fuel stove gives out around 4.8–5kW of heat and is really efficient, so it warms your room without burning through wood too quickly. The wide model has a fixed grate, so you can burn wood or even the odd smokeless fuel, and it’s DEFRA-exempt, meaning it’s fine for Smoke Control Areas. The convector system helps spread the heat around the room, and the air controls are simple to use—you don’t have to be a fire expert to get it going.

The handle has a nice knurled grip with champagne-coloured ends, and the overall look is traditional without feeling dated. You can fit it on a 12mm hearth, or even hook it up to an external air supply if you want. It’s the kind of stove that makes a room feel cosy and welcoming, ideal for those chilly winter nights.

Features

Solid steel body and cast iron door, designed for years of use
Large glass window with Airwash system for a clear view of the flames
4.8–5kW heat output with high efficiency to warm rooms effectively
Fixed grate for burning wood or occasional smokeless fuel
DEFRA-exempt, suitable for use in Smoke Control Areas
Convector system for even heat distribution and easy-to-use air controls
Traditional design with knurled handle and champagne accents
12mm hearth compatibility, and optional external air supply

Dimensions & Specs

SKU	728-061
Product Image icon	Warranty 10 Year
Brand	Onyx
Fuel Type	Multi-Fuel
DEFRA Approved	Yes
Chimney Type	Brick Chimney (Class 1)
Flue Options	128mm (5″)
Width	575mm
Height	669mm
Depth	398mm
Efficiency (%)	79.5%
Built From	Cast Iron, Steel
Style	Timeless, Traditional
Colour	Black
Energy Rating	A
12mm Hearth Installation	Yes
Heat Output	5kW
Warranty	10 Year

Heat Output Estimator

Unsure what size of Stove or Fire you need?

Try our handy Kilowatt Calculator to give you a rough idea what size of appliance you will need for your room.

Delivery Info

Free Next Day or Day of Choice Delivery

Orders over £100 (to most UK mainland addresses) qualify for FREE delivery.
Place your order before midday (with in-stock items) for next working day delivery or choose a delivery date that suits you.
Orders under £100 are subject to a £6.95 delivery charge.
Deliveries are made Monday to Friday.
Weekend delivery (Saturday or Sunday) is available at an extra cost – contact us to arrange.

Click & Collect

Would you like your item faster? Use our Free Click & Collect service.
Available on in-stock items from our warehouses.
When placing your order, simply add a note stating your preferred collection date.
If you’re unsure about collection options, just get in touch, we’re here to help.

Delivery - What to Expect

Our standard deliveries arrive via a 10-tonne lorry (similar in size to a bin wagon or fire engine), equipped with a tail lift and pallet truck.
Access must be suitable: solid, level surfaces (no gravel, steps, steep slopes, or grass).
For palletised deliveries the driver will move the pallet to the nearest accessible point, but cannot go over unsuitable terrain or carry goods indoors, though may place them inside a garage if accessible.
If you have narrow gates, restricted access, or other challenges, please let us know in advance so we can make suitable arrangements.
Our free service is a one-man delivery. We recommend having someone available to assist, especially for larger items.
The delivery driver is not able to unpack or install your goods unless this is a service you have selected.

Checking Your Delivery

On delivery of your palletised goods, the driver will wait up to 10 minutes while you inspect the item(s).
Please check your goods before the driver leaves. If there is any damage or the driver refuses to wait, note this on the delivery slip (e.g., “Driver did not wait – damage unchecked”).
For any damage found, mark the delivery note clearly and contact us immediately.

Missed Deliveries

If you miss your pre-booked delivery, a re-delivery charge may apply.
For smaller items sent via courier (e.g., stove glass), the courier will leave a note with redelivery instructions if you’re not home.

Additional Delivery Notes

Accessory items like fitting kits and liner packs may be sent separately via courier on the same day. You’ll receive email confirmation if this is the case.
Delivery times are generally between 9am–6pm, Monday to Friday.
Delivery depots may send SMS updates, but these aren’t guaranteed.

Please DO NOT book installers, plumbers, electricians or other contractors until your goods have been delivered and checked, as delays can sometimes occur beyond our control.

Frequently Asked Questions

How much does delivery cost?

Most of our items come with free standard delivery to mainland UK when you spend over £100, but some larger or more remote deliveries may incur additional charges. You can view your delivery cost by entering your postcode at checkout before completing your order.

Do you deliver to all parts of the UK?

Yes, we deliver across the entire UK, including the Scottish Highlands and Islands, Northern Ireland, and other offshore locations. To check the exact delivery cost to your address, simply enter your postcode at checkout.

Is Click & Collect available?

Yes! We offer Click & Collect on a wide range of our products. Simply call our customer service team to check if your chosen item is eligible. Once your order is ready, we'll notify you with full collection details, including opening hours and what to bring with you.

Do you deliver to the Republic of Ireland (ROI)?

Yes, we do deliver to the Republic of Ireland. Simply select Ireland as your delivery country at the checkout to view shipping options and charges. Please note that delivery times may vary depending on the item, especially for larger or heavier products like stoves and fireplaces.

When will my order be delivered?

We offer a range of delivery options, including next day delivery on many of our products when ordered before the cut-off time. Delivery times for larger or made-to-order items may vary, each product page displays estimated delivery times to give you a good idea of when to expect your goods.