Opus Octave 70i 5kW Inset Wood Burning Stove

Opus

Opus Octave 70i 5kW Inset Wood Burning Stove

Customers rate us 4.9 out of 5 (103 reviews)

£1,725.00

Free delivery to England and Wales on orders over £50.

Is it right for you?

Room size: one room of up to about 29 m² with a 2.4m ceiling (rule of thumb). Check your room
Chimney: fits into a fireplace opening with a chimney, which will usually need a liner.
Fuel: dry logs only.
Smoke control: exempt, so you can burn logs in a smoke control area.
Fitting: must be fitted by a HETAS registered installer. Find one by postcode

What else will I need?

Free delivery to England and WalesUsually 3 to 10 working days. The courier usually contacts you to book a day. Scotland and Northern Ireland charges are shown at checkout.

30 days to change your mind
Manufacturer's UK warranty
UK suppliers

5kWHeat output
Wood BurningFuel
Ecodesign2022 compliant
Smoke controlExempt appliance
80.7%Efficiency
3 yearsWarranty

The Opus Octave 70i is the inset version of the Octave 70, designed to be built into a wall, chimney breast or enclosure so the fire becomes part of the room. It gives 5kW nominal at 80.7% efficiency, comes with a 50mm four-sided frame, and is exempt for use in smoke control areas in England when burning approved fuel.

Why choose the Octave 70i

Built-in look, supplied with a 50mm four-sided frame.
Convection casing circulates warm air into the room.
5kW nominal at 80.7% efficiency; energy class A+ and Ecodesign ready.
150mm top flue, with the spigot supplied loose.
Smoke control exempt in England on wood logs.

Full details and specifications

What you'll need

Everything to get this stove lit

A stove on its own isn't enough. Here's what comes in the box, what else you'll need, and what your installer brings.

In the box

Heat-resistant glove; baffle plate; flue spigot

You'll also need

A carbon monoxide alarm. Required by law in the room with the stove.
Stove pipe to connect it to the flue. Your installer will tell you the length.
A hearth for it to stand on, if you don't already have one.
A chimney liner or twin-wall flue. Your installer supplies this.

Your installer brings

A liner sized to the stove, fitted up your chimney, after the chimney has been swept and checked.

Fitting, testing and a certificate showing it meets Building Regulations. Keep it for your home insurer and for when you sell.

Ask for one quote that covers the survey, flue, fitting and certificate. Using someone who isn't HETAS registered? Your local building control must approve the work before you use the stove.

Find a HETAS installer by postcode Got your installer's parts list? Email it and we'll price what we sell How flues and installation work

How buying a stove works

Check it fitsUse our size calculator, or email us a photo of your fireplace and the room size and we'll suggest stoves that suit.
Book a HETAS installerThey survey the chimney, quote for the flue and fitting, and tell you which parts to order.
We deliverFree to England and Wales, usually within 3 to 10 working days. It weighs 91kg, so have two people ready. Book the fitting date once it has arrived.
Your installer fits itThey fit the stove and CO alarm, test it and register it. You get a certificate to keep.

The numbers, in plain English

5kW heat output: Enough for a room of about 29 m² with a 2.4m ceiling (rule of thumb)
80.7% efficient: How much of the fuel's heat it turns into useful heat
150mm flue: The flue size your installer needs
Smoke control exempt: Legal to burn logs in a smoke control area
H 535 x W 695 x D 440 mm: Size (height x width x depth)
91kg: Two people to carry it in

Full specifications, clearances and the manual are further down the page.

About this product

Will it suit your space?

As a rough guide, an average room needs about 1kW for every 14 cubic metres, so its 5kW suits around 70 cubic metres. Older, draughty or high-ceilinged rooms need more, and a heat-loss check by your installer gives the right answer.

Firepower lists the 70i at 535mm high, 695mm wide and 440mm deep, and it weighs 91kg. Optional vents at the top and bottom of the chamber recover more heat.

Specifications

Model	Opus Octave 70i inset
Heat output	5kW nominal
Efficiency	80.7%, energy class A+
Fuel	Wood logs only
Dimensions	H 535 x W 695 x D 440mm
Weight	91kg
Frame	50mm four-sided frame included
Flue	150mm, top outlet; spigot supplied separately
Outside air	100mm, with the optional direct air kit
Installation gap	At least 80mm between the casing and the chamber walls
Ecodesign	Ecodesign ready
Smoke control	Exempt in England on wood logs up to 20% moisture
Warranty	3 years (glass, seals, grate and firebricks excluded)

What's in the box

A heat-resistant glove, the baffle plate and the flue spigot.

Installation and safety

Have it fitted by a HETAS-registered installer or signed off by Building Control, with a carbon monoxide alarm in the same room. Leave at least 80mm between the casing and the walls of the opening, never block the casing slots, and keep 400mm to combustibles at the sides and 1500mm in front.

Questions

Can I use it in a smoke control area?

Yes. DEFRA lists the Opus Octave 70i as exempt in England when burning wood logs with up to 20% moisture, with the permanent air stop the exemption requires.

Can it go into my existing fireplace?

It is designed for a wall or existing opening. Opus supplies the flue spigot loose to make fitting easier where the opening is close to the stove's height. Your installer will survey the opening and chimney.

Is the frame included?

Yes. The 70i comes with a 50mm four-sided frame.

See more inset stoves, the full Opus range and DEFRA approved stoves.

Delivery

Free delivery to England and Wales. Standard items usually arrive in 3 to 7 working days; large and heavy items in 3 to 10 working days. The courier normally contacts you to book a day. Scotland and Northern Ireland charges are shown at checkout.

Delivery policy

Returns

You have 30 days from delivery to change your mind, with no restocking fees. Returns after day 14 must be unused, uninstalled and in the original packaging. If we collect, it costs £90 for a single pallet item or £150 for two-person and multi-pallet deliveries; garden buildings, and collections from Scotland, Northern Ireland, the Highlands and islands, are priced before booking and never cost more than £250. Items made to your specification are excluded, and faulty or damaged goods are collected free.

Return and refund policy

Warranty

3 year manufacturer's warranty. The manufacturer's warranty terms apply, which can include registering the product, professional installation and annual servicing. Your rights under the Consumer Rights Act are not affected.

Installation and safety

In England and Wales, installing a solid fuel appliance is notifiable building work: use a HETAS registered installer, or apply to Building Control before the work starts. Scotland and Northern Ireland have their own building standards.
Building Regulations require a carbon monoxide alarm in the room when a solid fuel appliance is installed.
Exempt for burning wood in smoke control areas. Exemptions are listed separately for England, Wales, Scotland and Northern Ireland, so check the official list for your country.

Not sure it will fit?

Send us a photo and the measurements of your room, fireplace or garden and we’ll check it for you.

Email us

Why buy from Glowing Flames?

Free delivery

Free to England and Wales on orders over £50 (£9.99 below that). Large items come on a pallet and the courier books a day with you.
Real advice

Not sure it will fit or work with your chimney? Send us a photo and we will check.
UK warranties

Supplied by the manufacturer or its UK distributor, with the manufacturer’s UK warranty and spares.
30 days to change your mind

Change your mind up to 30 days after delivery, with no restocking fees and fixed collection prices for large items.

Opus Octave 70i 5kW Inset Wood Burning Stove