Heat Logs: Efficient, Eco-Friendly Fuel to Complement Your Kiln Dried Logs

Key Takeaways

• Heat logs are ultra dry heat logs - compressed wood briquettes with moisture content often under 10% - that burn hotter, cleaner and more efficiently than most traditional firewood logs.

• Logan's Logs sells three British and Scottish heat log brands: Roastie Toasties, Burlyburn Heat Logs and Woodlets Briquettes, each suited to wood burners and open fires with slightly different strengths.

• Pairing heat logs with kiln dried logs gives faster warmth, a long burn time and less ash, helping households across Cornwall and the UK cut fuel costs and lower emissions.

• All three products are sustainably sourced from UK timber or forest-floor wood, produce less smoke, and carry Woodsure Ready to Burn or Clean Air Act compliance for use in smoke-controlled areas.

• Below, we compare heat logs vs traditional fire logs in detail, then explain how to choose between Roastie Toasties, Burlyburn and Woodlets based on burn length, flame appearance and budget - a great alternative to relying solely on firewood.

What Are Heat Logs and Why Were They Invented?

Heat logs - sometimes called eco fire logs or briquettes - consist of compressed blocks of dry wood waste formed into dense, uniform shapes. They are made from 100% recycled wood waste: sawdust, shavings and untreated wood residues that would otherwise be discarded by sawmills and forestry operations. During manufacturing, immense pressure binds wood fibres together through natural lignin, meaning heat logs are held together by natural lignin without glue, chemicals or additives.

They emerged in the late 20th century across the UK and Europe as sawmills needed a productive use for mounting wood waste. Instead of letting by-products rot or burning them uncontrolled, manufacturers compressed and dried them into a fuel with far more consistent performance than variable cordwood. Where traditional firewood can sit at 20–30% moisture or higher, quality heat logs have a low moisture content typically below 10%, which dramatically improves how heat logs burn.

That combination of compression and dryness means higher calorific value per kilogram, less smoke, and more predictable burn times. On a cold January evening in Cornwall, a couple of briquettes in a wood burning stove can warm a living room faster than an armful of damp cordwood ever could.

Heat Logs vs Traditional Firewood Logs

At Logan's Logs we specialise in kiln dried firewood logs as well as heat logs, and many customers successfully mix both to get the best of each fuel. Here are the key advantages and differences:

• Heat output - Quality briquettes like Roastie Toasties and Woodlets are rated around 4.8 kWh/kg and can burn 20% hotter than kiln dried wood of similar weight. Heat logs burn significantly hotter than regular wood due to their densely compressed structure, giving you great heat from fewer pieces.

• Burn time - Heat logs provide a burn time of 1.5 to 4 hours depending on the product and stove settings, with a longer, more predictable burn due to their uniform density and size. Traditional logs tend to be quicker and more variable.

• Ash and smoke - High-quality heat logs produce considerably less ash and smoke than ordinary logs. Ash residue is often less than 1%, making clean-up easier compared with bark-heavy firewood.

• Moisture - Good-quality wood fuel should generally be at 20% moisture or below for efficient combustion. Kiln dried logs meet that threshold, but heat logs go further at under 10%, providing higher energy efficiency and lower moisture content than traditional firewood.

• Practicality - Heat logs are convenient and consistent, with less variation in size, moisture and density. They're uniform in shape, making them cleaner to store than loose logs. However, traditional logs deliver the attractive flame pattern, natural aroma and crackling sound many people want.

• Cost - Because heat logs have a high energy density, releasing more heat per weight than ordinary logs, households often use fewer pieces per evening. Some customers see up to 40% annual savings versus regular price purchases of lower-quality, wetter firewood logs.

Many people prefer to start a fire with a couple of heat log "pucks" for fast heat, then top up with kiln dried hardwood for flame character - logs provide the atmosphere, heat logs provide the power.  Check out our FAQs page for more answers to frequently asked questions about heat logs.

Why Heat Logs Burn So Efficiently (and Cleanly)

Efficiency comes from a combination of low moisture, high density and quality control during manufacturing. Heat logs do not create more energy than wood itself contains, but they are more efficient due to their dryness, density and consistency.

• Lower moisture means less energy wasted boiling off water - more of each kilogram turns into room-warming heat instead of steam up the chimney.

• The compression process creates dense briquettes with consistent shape, which helps airflow in stoves be more predictable than with random-sized firewood. Manufactured heat logs have a uniform size, shape and density for a predictable burn rate.

• Heat logs produce ultra-low emissions when burned. The ultra-low moisture content produces less creosote and soot build-up on stove glass and in chimney flues, potentially reducing sweeping frequency.

• Heat logs ignite quickly, burn hotter and produce significantly less smoke than unseasoned wood - clean burning fuel that makes it easier to meet Clean Air Act requirements.

• Heat logs burn almost completely, leaving behind minimal ash residue. They typically burn for 2 to 3 hours, and expand slightly as they burn, providing a steady release of heat.

• In smoke-controlled areas, Woodsure Ready to Burn and low-emission briquettes are designed to comply with tighter standards when used in a DEFRA-approved appliance.

Logan's Logs Heat Logs Range: Roastie Toasties, Burlyburn and Woodlets

We offer three types of heat log - all suitable for wood burners, multi-fuel stoves and open fires across Cornwall, Plymouth and the wider UK. Each is made from sustainably sourced UK or Scottish timber with moisture under 10% and ash under 0.7%, making them ideal partners for kiln dried wood. Although all three burn hot and clean, they differ in lighting speed, burn duration and which customers they suit best. All can be ordered online for delivery throughout Cornwall and Plymouth, with next working day delivery via courier for other UK postcodes, or collected via free click and collect from our Wadebridge store.

Roastie Toastie Sustainable Wood Briquettes

Roastie Toasties are a premium briquette made in Scotland from leftover forest-floor wood that would otherwise go to waste - a 100% sustainable, eco friendly fuel. Key specs: calorific value around 4.8 kWh/kg, moisture under 10%, ash below 0.7%, Clean Air Act compliant and suitable for stoves, open fires, chimineas and fire pits.

Briquettes can burn 20% hotter than kiln dried wood, meaning fewer are needed to produce the same warmth. Claims of up to 40% annual fuel cost savings make them compelling for homes running a stove as a primary heat source from October to March - a high heat output option for serious heating. Start an evening fire with 1–2 compressed wood briquettes, let them establish strong embers, then continue with more or add kiln dried hardwood logs for flame character.

Burlyburn Heat Logs

Burlyburn Heat Logs are UK-grown, Woodsure Ready to Burn certified briquettes sold in a 15 kg bag, designed for any solid fuel appliance. They're easy to break into smaller pucks by hand, and burn hot and steadily with minimal smoke, sparks or spitting - ideal for living rooms and holiday cottages.

The recommended method: break 1–2 logs into pucks with kindling and a firelighter to light the fire, then add 4–5 more pucks once established for a long, steady burn. Lower moisture means quicker start-up and cleaner stove glass, making Burlyburn especially attractive for regular weekday use. Sourced from UK renewable forestry, they deliver convenience and reduced transport miles compared with imported fuel - a versatile all-rounder to complement your firewood. For detailed lighting techniques, see our guide on how to light a fire in your wood burning stove.

Woodlets Briquettes

Woodlets Briquettes are compact, high-density, British-made briquettes produced from 100% UK timber from FSC responsibly managed forests. Woodlets Heat Logs are sourced from sustainable British forests and suit customers who burn their stove for many hours a day.

Each 10 kg pack contains six briquettes (approx. 295 × 70 × 70 mm), with Woodlets Heat Logs weighing around 2 kg each. Calorific value sits at 4.8 kWh/kg, with sustained heat output that can last up to twice as long as traditional logs. Woodlets Heat Logs have an active burn time of 1.5 to 2 hours, and each Woodlets Briquette can last up to 4 hours when used properly. Woodlets Heat Logs exceed Clean Air Act standards, produce ultra-low emissions, and leave compost-ready ash. Their uniform rectangular shape stacks neatly in sheds and log stores - the regular shape allows for efficient storage of usable heat, and compact packs fit easily into car boots for click and collect. A popular strategy: run Woodlets during the day for steady background warmth, then add a couple of kiln dried oak logs in the evening for bright flames and ambiance.

How to Use Heat Logs with Your Wood Burner or Open Fire

Heat logs can be used alone or mixed with kiln dried logs in your fireplace, stove or open fire. Here's how to get the best results:

• Use kindling and firelighters, start with a small number of briquettes or broken pucks, and keep stove vents fully open at first. Reduce airflow once a good ember bed forms.

• Heat logs can expand significantly as they burn, requiring proper loading in stoves. Break larger Woodlets or Burlyburn pieces in half for smaller appliances and avoid overfilling the firebox.

• A proven mix-and-match strategy: begin with 1–2 Roastie Toasties for quick ignition and rapid heat, then top up with kiln dried hardwood or Woodlets for extended, even burning throughout the evening.

• Because these fuels burn cleanly, you should see less tar and soot on stove glass and flues compared with burning damp wood. Still schedule a professional chimney sweep at least once a year before the heating season - see our safety and maintenance guide for more.

Environmental and Practical Benefits of Choosing Heat Logs from Logan's Logs

Less fuel used per winter, lower emissions and better use of UK forestry by-products: heat logs help you heat your home sustainably without sacrificing performance. Roastie Toasties use forest-floor leftovers, while Burlyburn and Woodlets use 100% UK timber from renewable or FSC-certified sources - a next generation fuel approach that reduces your carbon footprint compared with burning coal or wet, unseasoned wood.

By using very dry briquettes, households in Cornwall, Plymouth and beyond can reduce particulate emissions from their wood burners, supporting cleaner local air for the future. Heat logs are tightly packed in compact bundles, taking up less storage space than firewood, and the lighter bags are simple to move. You can buy in stock from single packs to full pallets - just add to your basket online. They're also suitable for fire pits, chimineas and certain BBQ setups, making them a year-round fuel option.

Treat heat logs as a smart complement, not a replacement, to quality kiln dried logs - combining efficiency, convenience and the traditional log-fire experience at a competitive price.