What Fuel Should You Burn in a Multi Fuel Stove?
Feeling the chill of rising heating costs? You’re not alone. As we head into 2026, getting the most out of every log and briquette is more important than ever. With modern Ecodesign rules and clean-burn requirements tightening up, choosing the right fuel for your multi-fuel stove isn’t just about warmth – it’s about efficiency, compliance, and protecting your investment.
So, what exactly makes a multi-fuel stove tick? It’s all in the design. Unlike a dedicated wood burner, a multi-fuel stove features a specialised grate system (often a raised, riddling grate) and versatile airflow controls. This allows air to come from below the fuel bed (primary airflow) to burn solid fuels, and from above (secondary airflow or ‘airwash’) to burn wood cleanly.
This guide will demystify the debate between smokeless fuel vs firewood, boost your multi-fuel stove efficiency, and help you find the absolute best fuel for your multi-fuel stove.
What Is a Multi-Fuel Stove?
Before we dive into the fuel itself, let’s clarify the multi-fuel stove meaning. In simple terms, it’s a versatile heating appliance designed to burn a variety of approved solid fuels, not just wood.
The key features that set it apart are:
- A Raised Grate: This allows air to circulate underneath the fuel, which is essential for burning smokeless fuels efficiently. Wood, by contrast, burns best on a flat bed of ash.
- An Ash Pan: Located beneath the grate, this pan collects the fine ash produced by mineral fuels, making cleanup much easier.
- Bottom Airflow Control: A dedicated vent allows you to control the primary air coming from underneath the grate, giving you precise control over the burn rate of coals and briquettes.
So, can a multi-fuel stove burn wood? Absolutely! That’s the ‘multi’ part of the name. You simply close the bottom vent and use the top airwash vent to burn wood, just like you wood in a wood burner.
Here’s a quick look at the differences between wood-burning and multi-fuel stoves:
| Feature | Multi-Fuel Stove | Wood-Burning Stove |
| Grate | Raised, often with a riddling mechanism. | Flat firebox floor. |
| Primary Fuel | Wood and authorised smokeless fuels. | Wood only. |
| Airflow | Primary (from below) and Secondary (from above). | Primarily Secondary (airwash from above). |
| Ash Management | Removable ash pan for easy disposal. | Ash builds up to form a bed for wood to burn on. |
| Flexibility | High – can switch between fuel types. | Low – restricted to burning wood. |
The Best Fuels to Burn in a Multi-Fuel Stove
This is the mega-section you’ve been waiting for. Choosing the right fuel impacts heat output, burn time, and how often you have to clean your stove glass. Let’s break down the top contenders.
1. Kiln-Dried Logs (Low-Moisture Firewood)
For that classic flame pattern and cosy aroma, nothing beats wood. But not just any wood. To comply with ‘Ready to Burn’ legislation, you must use logs with a moisture content under 20%. Kiln-dried logs are the gold standard. They are dried in a controlled environment to guarantee low moisture, resulting in a clean burn, higher heat output, and significantly reduced smoke and tar build-up in your flue.
- Pro Tip: If you’re searching for the best wood for a multi-fuel stove, look for certified kiln-dried logs UK. While cheaper, seasoned firewood for stoves can also be excellent, you must verify its moisture content with a meter before burning.
Shop the range of kiln dried logs at Direct Stoves >
2. Smokeless Coal (Authorised Smokeless Fuels Only)
This is where the ‘multi-fuel’ advantage really shines. Smokeless fuels are manufactured mineral fuels that produce incredible heat and can slumber for hours. Crucially, traditional house coal is now banned for domestic use in the UK. You must only use authorised smokeless fuels.
So, can you burn smokeless fuel in a multi-fuel stove? Yes, it’s what they are designed for! Always check that you are buying approved solid fuel UK from a reputable merchant. These are the go-to smokeless fuels for stoves in smoke control areas.
3. Smokeless Briquettes & Eco Briquettes
Briquettes are a fantastic, modern fuel choice. They are made from compressed materials like sawdust, wood chips, or other biomass. Their key advantages are their uniform shape and extreme density, which leads to a very long, consistent burn duration and high BTU output (a measure of heat).
Pro Tip: When comparing eco briquettes vs logs, briquettes often win on burn time and ease of storage. They are excellent briquettes for multi-fuel stoves, and many users seek out long-burning briquettes for overnight heating.
4. Peat, Turf, and Regional Fuels
In some parts of the UK and Ireland, burning peat or turf is a long-standing tradition. However, its availability and legality are changing due to environmental concerns. While it produces a distinctive, aromatic smoke, it’s generally a high-ash, lower-heat fuel compared to modern alternatives.
If you’re asking, ‘can you burn peat in a multi-fuel stove?’ the technical answer is yes, but it’s not recommended. It’s becoming harder to source, and cleaner, more efficient fuels are widely available. For those with an Irish turf multi-fuel stove tradition, consider switching to high-density eco briquettes for a similar long burn with less environmental impact.
Fuels You Should NEVER Burn in a Multi-Fuel Stove
Using the wrong fuel is not only inefficient but can be dangerous, illegal, and destructive to your stove and flue liner. This is a critical list of what not to burn in a multi-fuel stove for safety:
- House Coal: It’s now illegal to burn in UK homes due to high pollution levels.
- Wet Wood: Any wood with a moisture content above 20%. It creates excessive smoke, tar, and very little heat.
- Treated or Painted Timber: This includes fence posts, decking, and old furniture. They release toxic chemicals when burned.
- MDF, Chipboard & Pallets: These materials contain glues and chemicals that are harmful to breathe and can damage your stove. Pallets are often chemically treated.
- Driftwood: The salt absorbed by driftwood is highly corrosive and can rapidly destroy the internal components of your stove and flue.
- Rubbish & Waste Materials: Plastics, packaging, and general household waste produce toxic fumes and are not suitable for burning.
- Printed Paper: Burning large quantities of glossy magazines or printed paper releases harmful chemicals and creates a lot of floating ash.
How to Choose the Best Fuel for Your Multi-Fuel Stove
This actionable guide will help you decide.
- For maximum heat output → Choose high-quality smokeless coal/briquettes. Their dense composition provides the highest, most consistent heat.
- For clean glass and low maintenance → Kiln-dried logs are your best friend. They burn cleanly with minimal soot.
- For the longest burn time → High-density smokeless briquettes are the champions of all-day burning.
- For smoke control areas → You have no choice: you must use DEFRA-authorised fuels only. This includes all smokeless fuels, and certified ‘Ready to Burn’ wood (if your stove is DEFRA approved).
Still unsure? Here’s a quick comparison table:
| Fuel Type | Heat Output | Burn Time | Cost (per kWh) | Cleanliness |
| Kiln-Dried Logs | High | Short-Medium | Medium | Very High |
| Smokeless Coal | Very High | Long | Low-Medium | Medium |
| Eco Briquettes | Very High | Very Long | Low-Medium | High |
| Wet Wood (Avoid) | Very Low | Very Short | High (inefficient) | Very Low |
Ultimately, the cheapest fuel for a multi-fuel stove is often smokeless fuel or briquettes when measured by cost per kilowatt-hour (kWh) of heat produced, thanks to their efficiency and long burn times.
Fuel Storage Tips for Efficiency, Safety & Longevity
Proper storage is just as important as your fuel choice.
- Wood: A ventilated log store is essential. It should have a roof to keep rain off but slatted sides to allow air to circulate. Stacking logs off the ground prevents them from absorbing damp. Moisture management is key to an efficient fire.
- Smokeless Fuels & Briquettes: These must be kept dry. While they don’t absorb ambient moisture like wood, rain will ruin them. Store them in a sealed bunker, coal shed, or dry garage. Good condensation control in your fuel shed is vital.
The best way to keep wood dry is to allow constant airflow while protecting it from direct rain.
Signs You’re Using the Wrong Fuel
Is your stove underperforming? It might be your fuel.
- Blackened Glass: You’re likely burning wet wood or running the stove at too low a temperature, preventing the ‘airwash’ system from working.
- Excess Soot/Tar in Flue: This is a classic sign of burning unseasoned, damp wood. It’s a serious fire hazard.
- Low Heat Output: The fuel is probably damp, or you’re using a low-quality fuel with poor calorific value.
- Fuel Burning Too Fast: You might have the airflow vents open too wide. If you’re burning logs, they might be a softwood species; try a dense hardwood or briquettes for a longer burn.
- Clinkers in Ash Pan: This is a hard, glassy residue caused by burning fuel at excessively high temperatures or using a fuel with impurities. Some smokeless fuels are prone to this.
- Strong Smoke from Chimney: If you see thick, smelly smoke, you’re burning something you shouldn’t be, like damp wood, treated wood, or rubbish. A correctly operating stove should produce almost no visible smoke.
If you’re noticing these wrong fuel signs, it’s time to reassess what you’re burning. A stove burning poorly is inefficient and unsafe.
Before You Light the Next Fire
Choosing the right fuel for your multi-fuel stove is a simple balance of three things: efficiency, cost, and a clean burn.
- For ambience and a sustainable, clean flame, use kiln-dried wood.
- For raw heating power, longevity, and value for money, use smokeless fuels or high-density briquettes.
By following this guidance, you’ll not only stay warm but also comply with regulations, save money, and keep your stove running beautifully for years to come.
Ready to become a stove expert? Browse our other guides on stove maintenance and cleaning!
Frequently Asked Questions (FAQ)
Here are some detailed answers to the most common questions:
Q: Can a multi-fuel stove burn wood and coal at the same time?
A: While you technically can do this, it is strongly not recommended. Burning wood and smokeless fuel together is inefficient and can even damage your stove over time.
Here’s why:
- Different Air Requirements: Wood burns best with air from above (secondary air), which fuels the combustion of gases released from the wood. Smokeless fuel needs air from below the grate (primary air) to burn effectively. Trying to provide both at once means neither fuel burns at its optimal efficiency.
- Inefficiency and Smoke: When mixed, the wood tends to smoulder due to a lack of sufficient top-down air, creating excessive smoke and tar. This will blacken your stove glass and dramatically increase creosote buildup in your flue, which is a fire hazard.
- Corrosion Risk: The moisture released from the wood (even kiln-dried logs have some moisture) can mix with the sulphur present in mineral fuels. This can create a mild sulphuric acid, which is corrosive to the stove’s internal components and your flue liner.
- Best Practice: Burn one fuel at a time. If you want to switch from wood to smokeless fuel, let the wood fire burn down to a hot bed of embers, then add the smokeless fuel and open the primary air vent.
Q: Is smokeless fuel better than wood?
This really depends on your priorities, as each fuel excels in different areas. There’s no single ‘better’ fuel, only the ‘better’ fuel for your specific needs.
Choose Smokeless Fuel if you prioritise:
- Maximum Heat Output: Smokeless fuels have a very high calorific value (BTU), delivering intense and convenient heat.
- Long Burn Times: They are dense and burn slowly, making them perfect for keeping a room warm throughout the day or slumbering for hours with minimal intervention.
- Convenience: They come in uniform sizes and are easy to store in a bunker or shed, often taking up less space than an equivalent energy value of logs.
Choose Kiln-Dried Wood if you prioritise:
- Ambience and Aesthetics: Nothing beats the lively, dancing flames and cosy crackle of a real wood fire.
- Sustainability: When sourced from responsibly managed forests, wood is a renewable and carbon-neutral fuel source.
- Cleanliness: Properly burned dry wood produces very fine, soft ash and is generally less harsh on the stove’s interior components.
Many owners use both: wood for a beautiful evening fire, and smokeless fuel for when they need serious, long-lasting heat.
Q: What fuel burns the hottest?
A: The highest heat output comes from fuels with the highest energy density and carbon content.
The general hierarchy for heat output (BTU) is:
- Anthracite-based Smokeless Fuels: These are at the top of the pyramid. Anthracite is a hard, compact variety of coal with an extremely high carbon content, leading to the highest heat output. Manufactured smokeless ovoids are engineered to match or exceed this.
- High-Density Eco-Briquettes: Made from highly compressed wood or biomass, these can produce heat comparable to top-tier smokeless fuels.
- Kiln-Dried Hardwoods: Dense woods like oak, ash, and beech burn hot and long.
- Kiln-Dried Softwoods: Woods like pine and larch ignite easily and burn very hot initially, but they don’t burn for quite as long as hardwoods.
A word of caution: Chasing the absolute hottest burn can be dangerous. Over-firing your stove (running it above the manufacturer’s recommended temperature) can warp the stove body, crack the glass, and damage the internal firebricks and flue. Always use a stove thermometer to ensure you’re operating in the safe and efficient zone.
Q: Does a multi-fuel stove need different fuel from a wood burner?
A: Yes, absolutely. This is the fundamental difference between the two appliances.
A wood-burning stove is a specialist designed only for burning wood. It has a flat firebox floor because wood burns most efficiently on a bed of its own insulating ash. It lacks a grate robust enough to handle the intense, focused heat of mineral fuels. Burning coal in a wood burner will destroy it.
A multi-fuel stove is a versatile generalist. It has a raised, riddling grate and an ash pan specifically to accommodate smokeless fuels, which need air from below and produce more ash. This grate is built from durable cast iron to withstand the higher temperatures.
So, while you can burn wood perfectly well in a multi-fuel stove (by closing the bottom air vent), you can never burn smokeless fuel in a standard wood burner.
Q: What is the cheapest fuel for heating a multi-fuel stove?
A: The cheapest fuel is not the one with the lowest price per bag, but the one with the lowest cost per kilowatt-hour (kWh) of heat produced. This accounts for how much heat the fuel contains and how long it burns.
- Generally Most Economical: High-density smokeless briquettes or smokeless coal often provide the lowest cost per kWh. Their high energy density and long, slow burn rate mean you use less fuel to generate the same amount of heat over a longer period.
- Potentially Economical: Kiln-dried logs can be very cost-effective if you can buy them in bulk (by the crate or cubic metre) from a local supplier. Buying small, plastic-wrapped bags from a garage forecourt is usually the most expensive way to buy wood.
- The Most Expensive Mistake: The most expensive fuel is, without a doubt, cheap, wet wood. You pay for fuel that wastes most of its energy boiling off internal moisture instead of heating your room. It’s incredibly inefficient and also creates costly flue problems.
Q: Are multi-fuel stoves allowed in Smoke Control Areas?
A: Yes, they are, but you must follow strict rules to avoid a hefty fine. A Smoke Control Area is a zone where you cannot emit a significant amount of smoke from your chimney.
You have two ways to comply:
- Use an Authorised Fuel: This is the easiest method. You can burn any fuel that appears on the official DEFRA list of authorised fuels in your multi-fuel stove. These are typically smokeless coals and manufactured briquettes. Look for the ‘Authorised for use in smoke control areas’ logo on the packaging.
- Use an Exempt Appliance (with the right fuel): Some modern stoves are so clean-burning they are classified as ‘DEFRA-exempt’. This means the appliance itself is approved to burn specific fuels (like wood) in a Smoke Control Area. Even with an exempt stove, you must still use the correct fuel, i.e., ‘Ready to Burn’ wood with less than 20% moisture.
Q: What ruins a chimney liner?
A: A chimney liner is a critical safety component, and it can be easily damaged by improper use. The three main culprits are:
- Creosote and Chimney Fires: This is the biggest threat. Burning wet wood releases moisture that mixes with smoke, condensing inside the cooler flue as a flammable, tar-like substance called creosote. If this buildup ignites, the resulting chimney fire can reach over 1100°C, which will buckle, crack, or completely destroy a stainless steel liner.
- Chemical Corrosion: Burning the wrong things creates a chemical attack on the liner. The main offenders are:
- Driftwood: Contains salt, which is extremely corrosive to stainless steel at high temperatures.
- Household Rubbish: Plastics and treated materials release acids and chemicals that eat away at the metal.
- Constant Slumbering with Coal: Continually burning smokeless fuel at a very low temperature can cause acidic condensation to form, leading to long-term corrosion.
- Aggressive Cleaning: Using improper tools, like sharp metal scrapers or chains, can scratch and gouge the inside of the liner. These scratches create weak points that are vulnerable to heat damage and corrosion. Always use a correctly sized polypropylene flue brush.
How to protect your liner: Only burn dry approved fuels and have your chimney swept at least once a year by a certified professional.
