5kW Wood Burning Stove — Peanut Bignut 5 Log Burner, DEFRA Exempt
- England & Wales — your installer signs the work off.
- Scotland & Northern Ireland — it also needs council approval. We'll tell you what to apply for.
Accessories that fit this stove
Genuine parts made for this model, supplied by the manufacturer. Added here, they travel on the same pallet as the stove — no second delivery charge, and nothing to order separately later. Sprayed and burnished finishes add five working days to dispatch.
Not sure which you need? Ask us and we will check it against your model and your install before you order.
Description
The Peanut Bignut 5 is a wood-burning stove rated at 5 kW, 80.1% efficient, DEFRA-exempt for smoke control areas. It ships direct from the manufacturer in Dorset — dispatched the same working day on orders placed before 11am, on a two-day pallet service to mainland England and Wales.
Available in standard and tall heights — choose above. The taller version raises the firebox to a more comfortable viewing height; the specification block gives both sets of figures.
What arrives, and how
- OrderPlaced before 11am on a working day, it leaves the same day. Your order goes straight to the manufacturer in Dorset; nothing sits in a warehouse.
- DeliveryThe pallet courier rings to agree a weekday. Two-day service, kerbside — the driver brings the pallet as close as level, solid ground allows. Mainland England and Wales as standard; for the Scottish Highlands, Northern Ireland and the islands, ask us for a quote before ordering.
- InstallYour HETAS installer fits the liner, hearth and stove, commissions it and issues the certificate. Typically a day.
- GuaranteeRegistered with the manufacturer on installation, per their terms.
Specifications published by the manufacturer at https://www.saltfire.co.uk/products/bignut-5, read 7 September 2026. Room sizing is the trade rule of thumb (room volume ÷ 14) and is a guide, not a calculation. Dispatch and delivery terms per Saltfire Stoves, 2 September 2026.
Will it heat my room?
- 5.0 kWNominal heat output
- 70 m³Suits roughly this room
- 80.1%Efficiency
- 125 mmFlue size
In plain terms: a 5 kW stove suits a room of about 28 m² with a normal 2.5 m ceiling — roughly 5.3 m × 5.3 m. The trade rule of thumb is room volume in cubic metres divided by 14. It is a guide, not a calculation: insulation, glazing and how open the room is all move it, and your installer will confirm. Oversizing is the common mistake — a stove run too low tars up the glass and the flue. Peanut publish an operating range of 3–8 kW for this model.
Rule of thumb: about 1 kW for every 14 m³. A well-insulated room needs less, an old draughty one more.
Can I install this where I live?
Three questions, answered before you buy
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01
Do you live in a smoke control area?
Most UK cities are one. Burning wood there is legal only in a DEFRA-exempt appliance, and this stove is one. Check your postcode on your council's website.
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02
Do you have a chimney, or room for a twin-wall flue?
An existing chimney usually needs a stainless liner. No chimney is not a blocker — a twin-wall system can be run through a wall or roof. Either way it is the installer's call.
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03
Who signs it off?
A HETAS-registered installer self-certifies and issues the certificate. Any other route means notifying building control before work starts. You need that paperwork when you sell the house.
What a compliant install looks like
- Flue liner — a stainless liner up the chimney, sized to the 125 mm outlet. Without a chimney, a twin-wall system runs up a wall or through the roof.
- Register plate — closes off the old chimney opening around the liner, so heat and debris stay where they should.
- Hearth — non-combustible, sized to Building Regulations Document J and extending in front of the door.
- Carbon monoxide alarm — required in the same room. Your installer fits and tests it.
- Clearance to combustibles — 450mm to side walls / 450mm to rear wall for this model.
Illustrative only — your installer works to the manufacturer instructions and Building Regulations Document J.
Specification
Dimensions & build
| Height — standard | 579mm |
| Height — tall | 790mm |
| Width | 485mm |
| Depth | 339mm |
| Weight — standard | approx. 110kg |
| Weight — tall | approx. 120kg |
| Flue outlet | 5" / 125mm |
| Distance to combustibles | 450mm to side walls / 450mm to rear wall |
| Hearth | Suitable for a 12mm hearth |
Performance
| Nominal output | 5 kW |
| Operating range | 3–8 kW |
| Efficiency | 80.1% |
| Fuel | Wood only |
| DEFRA | Exempt — smoke control areas |
| EcoDesign | Compliant, 2022 ErP |
| Suits room volume | approx. 70 m³ |
| Finish | Metallic black as standard; door colours to order |
| Guarantee | 5 years |
In the box, and what else you need
Included
- Peanut Bignut 5 stove body, assembled
- Door handle and air control
- Manufacturer's manual and guarantee documentation
You'll also need
- Flue liner or twin-wall system — sized to the 125 mm outlet
- A compliant hearth — non-combustible, to Building Regulations Document J
- Register plate and closure plate for a chimney installation
- A carbon monoxide alarm in the same room — a Document J requirement
- A HETAS-registered installer, or building-control notification
Your installer will size and supply most of this. Ask us and we will quote the liner kit with the stove.
- DEFRA exempt
- EcoDesign 2022
Questions people ask before they buy
Wood burning stoves need a flue, a hearth and an installer. These are the questions people actually ask before ordering one — answered straight, including the ones that might stop the sale.
I live in a city — can I legally burn wood?
Yes, if the stove is a DEFRA-exempt appliance — the certification block on this page says whether this model is. Most UK cities are smoke control areas, where burning wood in a non-exempt stove is an offence. Check your postcode with your council.
Do I need a chimney?
No. An existing chimney is usually lined with a stainless flexible liner. Without one, a twin-wall insulated flue can be run up an outside wall or through the roof. Your installer will advise which suits the property.
Can I fit it myself?
Legally you may, but the installation must then be notified to building control and inspected. Using a HETAS-registered installer avoids that — they self-certify and issue the certificate you'll need when selling the house. It also protects the guarantee.
What does delivery actually involve?
The stove ships on a pallet on a two-day service to mainland England and Wales. The courier calls to agree a weekday, so someone needs to be in. It is a kerbside delivery and stoves are heavy, so arrange help to move it. For the Scottish Highlands, Northern Ireland and the islands, contact us for a quote before ordering.
Wood only or multi-fuel — which should I choose?
Wood only if you'll burn logs, which is what most people do and what suits these stoves best. Multi-fuel adds a grate and ashpan for smokeless fuel. In a smoke control area, only approved smokeless fuels — or wood in an exempt appliance — are permitted.
How long before it’s fitted?
The stove leaves the manufacturer the same working day if you order before 11am, and delivers on a two-day service. Installer lead times are the longer part — book that first, especially between September and December.
Something not covered here? Message us before you order. If it is a question only the manufacturer can answer, we will ask them and come back to you.
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