Our Indispensable Guide to Briquettes


Don’t worry – it’s easier than you think! Our guide to briquettes will help you become a wood fuel expert in no time.

Wood Briquettes and Heat Logs are interchangeable terms. They both describe a product made from wood by-products. This might be sawdust, wood chip, or wood flour, using extreme pressure to form a block or log shape.

Different briquettes have different burning characteristics, making some more suitable for specific stages in your fire’s life.

Some are great for lighting the fire; others are ideal for a nice hot flame during the day, while some are designed for slow overnight burning.

Every stove is different, depending on air flow, flue set up, and especially weather conditions. One thing we’ve learned is that there’s no such thing as one ‘best’ briquette for everyone. The best option is to try a few and see what suits you. Our Sample Packs and Ready Mixed Pallets are ideal for this.

Generally speaking, a single good quality, compressed heat log is the equivalent of three or four traditional logs.

Guide to Briquettes: What makes a good briquette?

pile of wood sawdust and shavings

Composition: What is the briquette made of?

Fuel briquettes can be made of almost any biomass material, including hardwood, softwood, straw, bracken, paper, coffee, canola, etc. Our briquettes are made from pure wood waste.

We choose to stock wood briquettes made from unadulterated hardwood or softwood. Some other biomass products such as straw, bracken, and coffee tend to have a higher ash content and lower calorific value than clean timber.

The right timber is important too. It’s tempting to use old pallets or used timber from building works but  there can be hidden extras you don’t want. Waste wood often contains glues, paints and binders, all of which can give off unpleasant and smelly fumes whilst burning.

Because of this, we only stock pure wood briquettes, that we know have no additional nasties in them.

Guide to Briquettes: Compression: Is the briquette dusty or crumbly?

Compression refers to the amount of pressure the wood is placed under to make it into a briquette. High compression is better – these briquettes are denser and less dusty.

Poor quality machines running at low compression levels produce cheap and dusty briquettes. We avoid these because they often put people off burning briquettes.

High quality briquettes are made using big, expensive machinery working with very high forces to produce densities of over 1,000kg/m3. The result is briquettes of high calorific value that hold their shape and burn long and hot.

Guide to Briquettes: Calorific value: How much heat can it produce?

pini kay heat logs burning woodfuel coop guide to briquettes

We compare calorific value in terms of kilowatt hours per tonne (kWh/tonne) as this enables an easy comparison to be made with other heating fuels, such as coal, gas and oil.

As a rough guide, traditional logs have a calorific value of around 4,100 kWh/tonne (depending on moisture content and tree species) whilst good quality briquettes have a calorific value of between 4,800 and 5,000 kWh/tonne depending on compaction and tree species. (Note: 5,500kWh/tonne is the same as 5.5kWh/kg.)

Calorific value measures heat output.

Ash content: How much ash will it produce after burning?

This is how much ash is left in the ash pan when you clean the fire out. Virgin timber briquettes that have had the bark removed produce much less ash than traditional logs. Some of our briquettes are as low as 0.28% ash. Bracken briquettes, as a comparison, are 4-7% ash.

However, some bark in the mix can add to the calorific value and lots of bark in a briquette can help retain heat in your stove for longer periods and even overnight. Our pure Overnight Bark Briquettes are about 4% ash and can burn up to 12 hours. Bark contains more silica than cleaned timber and it is the silica that creates ash.

Ash from pure wood-burning is a great source of potash for your garden, so it can be safely added to the compost bin. Just make sure it’s completely cold first!

Moisture content: How much water is in the briquette?

kiln-dried birch logs

Wood briquettes generally have a water content (moisture content) of under 10%. Most high quality briquettes are dried down to under 6%.

Traditional logs, by comparison, are considered suitable for burning when below 20% and most winter purchased logs are around 30% moisture content. That’s a lot of water to evaporate, and a very expensive way to buy water.

Generally, the drier the better. Combustion goes to generate heat rather than to drive off moisture before the fuel can start producing heat for you. However, dry but poorly compacted briquettes burn too fast. Although they’re often cheap, it’s poor value compared to densely compacted but necessarily more expensive briquettes.

Additives: What else is in it?

The answer to this should always be ‘nothing’.

None of our briquettes contain any additives (to assist burning) or binders (to assist compaction). All our briquettes are held together by the natural lignin released from the wood under intense compaction pressure.

Remember: if the wood content is dry enough, you do not need additives to assist burning. And if the heat log is highly compressed, you don’t need to add binders. So, a good quality briquette will not have and will not need any additives.

Product Standards: Are there industry standards I should look for?

The best quality briquettes are made to European Standards. They tell you the manufacturer is complying with European standards for composition, traceability, environmental sustainability and product quality. The standards to look for are: ├ľNORM M7135 (Austria) or DIN51731 (Germany). The EU and British Standard equivalents are BS EN 15210-1 2009 and BS EN 15210-2 2010.

However, there are many excellent quality briquettes available that are not certified because the certification process is onerous and expensive. Responsible manufacturers will always be able to provide the information we describe above, regardless of their certification.

Pack size:

While weight isn’t a reliable way to buy traditional logs, the consistency of briquettes means that knowing your price per kilo is really helpful.

Most pack weights are around 10kg, but some are 5kg, 12kg, 15kg and others 20kg. Clearly this needs to be taken into account when comparing prices between products. That is why we always give a ‘price per kg’ to assist with comparison.

It may seem obvious, but don’t assume more is better (I frequently have to field the comment “Ah, but there are four in this pack and five in that pack”); four briquettes per 10kg pack or twelve briquettes per 10kg pack; it’s the same energy, it’s just that the four at 2.5kg each should last longer than ten at 1kg each.

Pallet size:

Again, although most pallets weigh 1 tonne, some weigh more and some less. Take this into account when comparing prices and look for our ‘price per kg’ info.

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Quick guide to choosing the best Wood Fuel for your stove and lifestyle.

Wood Fuel Co-operative

*Break - We strongly recommend you break these briquettes in half (or less for very small stoves) because they do expand whilst burning and you don't want them to overfill the fire.
*Easy to light - We always use a Firelighter and Kindling Sticks to start our fires. Most briquettes are graded four stars to light because they are quite dense and require kindling.


  • All stove and flue combinations tend to have different burning characteristics. Fuel that works well in my stove may not work so well in your stove, and vice-versa.
  • Most modern stoves are more efficient than most older stoves, meaning a modern quality stove will burn fuel more economically and generate more heat over a longer period.
  • Always try to burn fuel with a 'lick of flame'. Smouldering fuel to try to extend burn time is bad for your stove, flue and the environment due to unburned particulate matter in the smoke.
  • Be prepared to break briquettes into smaller sections to fit into your stove comfortably. Many briquettes do expand whilst burning and you don't want them to expand onto the glass.
  • The chart above indicates which briquettes are easy to break. Some are small enough so they don't need breaking. This makes for a cleaner environment around your stove.
  • All briquettes, except Everyday Value and Hotmax, benefit hugely from using kindling to light them. I suggest five kindling sticks will be sufficient, meaning a net should last 30 days.