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A Complete Guide To

Certainly Wood’s Briquettes


Every fire serves a different purpose, whether you want instant warmth after a cold day, a steady glow to carry you through the evening, or low, gentle heat that keeps the room comfortable for hours. Our range of  briquettes gives you the flexibility to heat your home exactly the way you like, with each product offering ultra-low moisture, clean burning and dependable performance.
FeatureHeat BriquettesSlow Briquettes
MaterialKiln dried woodchips with small amount of barkCompressed bark
Heat OutputModerate/GoodLong & slow
Burn TimeUp to 4 hours  (if vents are closed)Burn up to 6-8 hours*
Best UseDaily heating: versatile heatEvening/overnight burn / Take the chill off
Ash ProductionVery lowVery low
*under certain conditions
Slow Burn Briquettes are designed for those moments when you want gentle, sustained warmth rather than intense heat. Made from compressed bark, they burn slowly and evenly, offering a consistent output for 6–8 hours when your stove’s seals and airflow are well controlled. 

Their dense, compact structure means they don’t produce roaring flames; instead, they give you a warm, steady glow that’s perfect for maintaining steady background heat or overnight comfort. Because bark naturally burns more slowly than wood, these briquettes offer exceptional longevity with minimal ash and a calm, controlled burn.
They are ideal for:
  • Maintaining steady background heat
  • Low heat, evening-long fires without frequent refuelling, perfect for taking the chill off
  • Overnight burns in well-sealed stoves
  • Mild winter days where high heat isn’t required

Slow Burn Briquettes

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Heat Logs are the perfect choice when you want strong, reliable warmth with the flexibility to control how your fire behaves. Made from kiln dried woodchips with a touch of bark, they are densely compressed under high pressure to create a clean, efficient fuel with an excellent calorific value.

Their dense structure allows them to deliver good heat output, but with the added benefit of versatility. By simply adjusting your stove’s airflow, you can tailor their burn to match your heating needs. With open air vents, they produce a fast, powerful heat that quickly warms your home. Reduce the airflow, and they settle into a slower, more moderate burn that can last up to 4 hours when placed on a good bed of embers.
They are ideal for:

  • Quick heat when you need warmth fast
  • A more moderate, steady burn when vents are reduced
  • Evening-long comfort with burn times of up to 4 hours
  • Open fires
  • Homes looking for a clean, sustainable, easy-to-use fuel

Heat Briquettes

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What's the difference?

Slow Burn Briquettes and Heat Briquettes contain the same amount of energy, but release it very differently. 

Slow Burn Briquettes, made from compressed bark, provide 6–8 hours of gentle, steady warmth, making them ideal for long evenings or overnight use. 

Heat Briquettes, made from kiln-dried woodchips with a touch of bark, offer a hotter, more responsive burn that lasts up to 4 hours, giving you the flexibility to create fast heat or a more moderate output by adjusting your airflow. 

Both are made in Wales, produce low ash, and perform best when added to a good bed of embers with correct air control.
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How To Use Them For Best Results

All our briquettes perform best when added to an already established fire. Their dense structure and low moisture content mean they ignite most efficiently when placed onto a warm, glowing bed of embers. Once they’re burning, you can easily control heat output by adjusting your stove’s air vents, opening them for a stronger flame or reducing airflow for a slower, longer burn.

However, if you would like to light a fire using briquettes or Heat Logs, a simple method works well:

  1. Start by stacking 6–8 sticks of kindling in a jenga-style formation.
  2. Place one Flamer in the centre of the kindling stack.
  3. Light the Flamer and allow the kindling to fully establish into a strong flame.
  4. Once you have a stable, well-lit base, add two briquettes on top.
  5. Keep your bottom air vent fully open until the briquettes have properly ignited and are burning steadily.
  6. Then adjust your vent settings as required, wide open for faster, hotter heat, or reduced airflow for a slower, more controlled burn.

Using the correct airflow makes a significant difference to performance, and a stove with good seals will always help extend burn times and maintain even heat.
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Looking for more information?

If you’d like to build your confidence and get even better results from your stove, take a look at our helpful guide: The Beginner’s Guide to Starting a Fire in Your Fireplace  
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It walks you through simple, effective fire-lighting techniques to ensure a clean, reliable burn every time.
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