Wood-burning and multi-fuel stoves have become a central feature of UK renovations over the past decade, combining visual warmth with genuine supplementary heating. But the regulatory landscape shifted significantly when Ecodesign limits for new stoves took effect in January 2022, and homeowners in smoke-control areas face additional restrictions. Understanding the real difference between a wood burner and a multi-fuel stove, and which is right for your home, can save you significant money and future headaches.
Wood Burner vs Multi-Fuel Stove: What Is the Actual Difference?
Both types of stove heat a room by radiating heat from a firebox. The difference lies in the combustion chamber design:
Wood-burning stoves have a flat base or log grate and draw air from the front or sides. They are optimised for wood, logs sit on the base and burn slowly with a controlled air supply. Running coal or smokeless fuel in a wood burner damages the grate and base (coal burns hotter and the ash is more corrosive).
Multi-fuel stoves have a raised riddling grate (a cast-iron grate that can be shaken to drop ash into a bottom chamber) and a primary air supply from below the grate. This allows both wood and approved solid fuels, including smokeless coal briquettes, anthracite, and compressed fuel logs, to burn efficiently.
| Feature | Wood burner | Multi-fuel stove |
|---|---|---|
| Burns logs | Yes | Yes |
| Burns smokeless coal | No | Yes |
| Burns house coal | No | No (house coal can no longer be sold for domestic burning in England) |
| Base design | Flat or log grate | Raised riddling grate |
| Typical efficiency | 75–85% | 70–82% |
| Typical unit cost (5 kW) | £600–£2,000 | £800–£2,500 |
| Smoke-control area use | Only DEFRA-exempt models | Exempt model to burn wood; authorised smokeless fuels in any model |
Ecodesign and Smoke Control Areas
Since January 2022, new stoves entering the UK market must be Ecodesign compliant, which means lower particulate emissions and higher efficiency than older stoves and open fires.1 This applies to both wood burners and multi-fuel stoves.
If you live in a smoke-control area (many parts of the UK are, and your local council can tell you), you can burn wood only in a DEFRA-exempt appliance, while authorised smokeless fuels can be burned in any suitable stove.2 DEFRA exemption is granted only to appliances shown, through tests at an accredited test centre, to emit smoke below acceptable limits.3 Not every Ecodesign-compliant stove is DEFRA-exempt, so check the stove manufacturer’s literature explicitly for the DEFRA-exempt status.
In a smoke-control area:
- A DEFRA-exempt wood burner can burn dry wood (moisture content ≤ 20%).1
- A DEFRA-exempt multi-fuel stove can burn dry wood and authorised smokeless fuels; a non-exempt one can burn authorised smokeless fuels only.
- Neither should burn house coal, which can no longer be sold for use in homes in England, or wet, unseasoned wood.4
Installation Costs
A new stove installation involves the stove itself, a hearth, a flue liner, a register plate, and a cowl. If you have an existing chimney, costs are:
| Component | Cost range (2026, inc. VAT) |
|---|---|
| Stove unit (5–7 kW) | £800–£2,500 |
| HETAS installation labour | £600–£1,200 |
| 316-grade stainless liner (per metre) | £35–£60 |
| Liner installation (6 m chimney) | £400–£700 |
| Register plate | £80–£150 |
| Hearth (slate or granite, supply & fit) | £250–£600 |
| Cowl and cap | £50–£120 |
| Total (existing chimney) | £2,500–£5,500 |
If there is no chimney, a twin-wall flue system through the roof adds £1,500–£3,500 to the above. These are jobs for a HETAS-registered installer. HETAS is a competent person scheme for solid fuel appliances, so a registered installer can self-certify the work instead of you applying to building control, saving you the £200–£400 building control fee.5 The installer notifies the job through HETAS, which sends the record on to your council.6
Fuel Costs Compared
| Fuel | Unit | Approx. cost (2026) | Calorific value |
|---|---|---|---|
| Seasoned hardwood (ash, oak) | per tonne | varies widely by area | about 4.1 kWh/kg (20% moisture) |
| Kiln-dried hardwood | per tonne | about £370 | about 4.1 kWh/kg |
| Smokeless coal briquettes | per 25 kg bag | £12–£18 | about 6.7 kWh/kg |
| Anthracite nuts | per 25 kg bag | £14–£20 | about 9.2 kWh/kg |
Forest Research puts air-dried log wood, at 20% moisture, at about 4.1 kWh per kg.7 Anthracite is more than twice as energy-dense, at 9.2 kWh per kg.7 Smokeless fuel is not cheaper heat, though: the Nottingham Energy Partnership’s September 2026 comparison puts smokeless fuel at about 13.4p per kWh of useful heat, against about 10.7p for kiln-dried logs.8 The convenience advantage of smokeless fuel (slower burn, longer hold overnight) is the main reason many homeowners choose a multi-fuel stove even though wood is their primary fuel.
Practical running cost: A 6 kW stove running 4 hours per evening delivers approximately 24 kWh of heat. Bought-in kiln-dried logs averaged 37.26p per kg in the East Midlands in September 2026, about 10.7p per kWh of heat in an 85%-efficient stove, so that evening costs about £2.60.8 The same heat from an 80%-efficient gas fire at the price cap gas rate of 7.97p/kWh costs about £2.40, so logs you have to buy are no cheaper than mains gas; wood saves money mainly where you have your own or a cheap local supply.9
Chimney Requirements
Each stove needs its own flue: Approved Document J says each solid fuel appliance should have its own flue.10 For the flue itself, Approved Document J (the official guidance on Part J) gives:
- An internal flue diameter of at least 150 mm for a stove of up to 30 kW burning any fuel.10
- 125 mm for a stove of up to 20 kW that burns only smokeless fuel, or a DEFRA-exempt stove burning wood.10
- A flue height of at least 4.5 m, which is usually enough for natural draught.10
- A liner at least equal to the designation T400 N2 D3 G under BS EN 1443, the rating for solid fuel.10 Flexible stainless liners are sold in 316 and 904 grades, and installers commonly recommend 904 where smokeless coal will be burned.
A HETAS-registered installer will assess the chimney, advise on the liner specification, and issue a HETAS Certificate of Compliance, which your insurer may ask for and which you will need when you sell the house.6
Which Should You Choose?
Choose a wood burner if:
- You have access to cheap or free seasoned logs.
- You are not in a smoke-control area (or will only use DEFRA-exempt dry wood anyway).
- You prefer maximum radiated heat output from wood.
Choose a multi-fuel stove if:
- You want the flexibility to use smokeless fuel during cold spells or when wood is unavailable.
- You have neighbours or chimney positioning issues that mean overnight burns on a hot fuel are useful.
- Your local area has easy access to smokeless briquettes at a reasonable price.
Either way, buy the largest stove your room can sensibly accommodate, undersized stoves are run flat-out (inefficient and dirty) while the right-sized stove can be throttled back for cleaner, more economical combustion. A commonly quoted rule of thumb: 1 kW per 14 m³ of room volume for a well-insulated modern home; 1 kW per 10 m³ for older, draughtier properties.
References (10)
Figures in this note were checked against the sources below on 2 October 2026. Superscript numbers in the text point to them. Every source the site cites, by topic.
- 1technicalvery strongDepartment for Environment, Food and Rural Affairs (UK-AIR), guidance.RN-73ZJ2SDefra's consumer guidance on burning at home. It states that since January 2022 new stoves must be Ecodesign compliant, and gives the 20% moisture threshold for dry wood.
- 2technicalvery strongGOV.UK, guidance.RN-55FX5RIn a smoke control area you must not release smoke from a chimney and must not burn unauthorised fuel unless it is in a Defra-approved exempt appliance. Authorised smokeless fuels include anthracite, semi-anthracite, gas and low volatile steam coal. Wood and other unauthorised fuels may only be burnt in a Defra exempt appliance, and only the fuel types the manufacturer specifies. Outdoor barbecues, chimineas, fireplaces and pizza ovens are outside the rules, as are garden bonfires that follow the bonfire rules. Penalties in England are up to £300 for smoke from a chimney and up to £1,000 for burning unauthorised fuel in a non-approved appliance. Whether an address sits in a smoke control area is confirmed by the local council's environmental services team.
- 3technicalvery strongGOV.UK, guidance.RN-HBS6THGOV.UK's appliance exemption page says an exemption shows a stove emits smoke below the acceptable limits, and the maker must prove testing at an accredited test centre.
- 4technicalvery strongDepartment for Environment, Food and Rural Affairs (GOV.UK), guidance.RN-G0D21FDefra guidance for coal retailers. It confirms that traditional house coal can no longer legally be sold for domestic use in England, while anthracite and low volatile coals can.
- 5technicalvery strongMinistry of Housing, Communities and Local Government.RN-SAMO3MThe official list of competent person schemes whose members can self-certify certain building work instead of getting building regulations approval, published 4 April 2013 and last updated 12 March 2018. Named schemes with contact numbers include ATTMA, APHC, Assure Certification, Blue Flame Certification, the British Board of Agrement, BESCA, Capita Gas Registration and Ancillary Services trading as Gas Safe Register, CIGA, Certass, Certsure LLP trading as NICEIC, the Elmhurst Airtightness Scheme, Fensa Limited, HETAS Limited, NAPIT Registration Limited, the National Federation of Roofing Contractors trading as CompetentRoofer, and OFTEC. Two footnotes matter: the Gas Safe Register is not technically a competent person scheme although in practice its installers carry the same building regulations responsibilities, and Benchmark Certification Limited ceased to operate as a competent person scheme on 10 February 2017, becoming part of NAPIT Registration Limited that day. Installers joining an electrical scheme are added to the single electrical competent person register.
- 6technicalstrongHETAS, guidance.RN-9TKJX2HETAS explanation of its Certificate of Compliance. It says registered installers notify work through HETAS, which passes records to the local authority, and that the certificate may be needed for insurance and a sale.
- 7technicalstrong locallyForest Research, guidance.RN-39RTL0Forest Research reference table of fuel calorific values. It gives air-dried log wood at 20% moisture as 4.1 kWh/kg against anthracite at 9.2 kWh/kg.
- 8costfairNottingham Energy Partnership.RN-23RP1HA price, true at 2026-09. Monthly domestic fuel cost comparison from an energy advice charity; for September 2026 it gives kiln-dried logs at 37.26p per kg, 4.09 kWh/kg and 10.73p per kWh of heat at 85% efficiency.
- 9technicalvery strongOfgem.RN-YYE8U2The live source for any running-cost sum in a heating note. For 1 October to 31 December 2026 the direct debit cap is 26.32p per kWh for electricity with a 54.83p daily standing charge, and 7.97p per kWh for gas with a 29.68p daily standing charge, giving a typical annual dual fuel bill of £1,723, a 4% rise on the previous period. Ofgem states these are the average unit rate and standing charge for direct debit customers in England, Scotland and Wales; gas prices include 5% VAT while electricity carried no VAT in this period. The cap is reset every three months, so any note quoting a pence-per-kWh figure should be dated against this page.
- 10technicalvery strongMinistry of Housing, Communities and Local Government.RN-IU0X2MThe 2022 amendments took effect 1 October 2022 and extended the carbon monoxide alarm provisions. Table 2 sets the minimum flue sizes: 200mm diameter for a fireplace with an opening up to 500mm by 550mm, 125mm diameter for a closed appliance up to 20kW burning smokeless or Clean Air Act compliant fuel, 150mm for other closed appliances up to 30kW and 175mm for those above 30kW and up to 50kW. Diagram 17 gives the flue outlet clearances: at or within 600mm of the ridge the outlet must be at least 600mm above the ridge, elsewhere on a roof it must be at least 2300mm horizontally from the nearest weather surface and either 1000mm above the intersection or as high as the ridge, and it must be 1000mm above the top of any openable rooflight or dormer within 2300mm. Bends must be no more than 45 degrees to the vertical and paragraph 1.49 limits a sweepable flue to four changes of direction.
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Burn Better, Breathe Better, Department for Environment, Food and Rural Affairs (UK-AIR), accessed 30 September 2026. uk-air.defra.gov.uk
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Smoke control areas: the rules, GOV.UK, accessed 30 September 2026. gov.uk
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Apply for an appliance exemption for use in smoke control areas, GOV.UK, accessed 2 October 2026. gov.uk
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Selling coal for domestic use in England, Department for Environment, Food and Rural Affairs (GOV.UK), accessed 30 September 2026. gov.uk
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Competent person scheme: current schemes and how schemes are authorised, Ministry of Housing, Communities and Local Government (GOV.UK), accessed 30 September 2026. gov.uk
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Certificate of Compliance: Building Regulations, HETAS, accessed 30 September 2026. hetas.co.uk
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Typical calorific values of fuels, Forest Research, accessed 30 September 2026. forestresearch.gov.uk
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Energy Cost Comparison, Nottingham Energy Partnership, accessed 30 September 2026. Priced at 2026-09 and left there. nottenergy.com
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Energy price cap unit rates and standing charges, Ofgem, accessed 29 September 2026. ofgem.gov.uk
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Approved Document J: Combustion appliances and fuel storage systems, Department for Levelling Up, Housing and Communities, accessed 30 September 2026. assets.publishing.service.gov.uk
