Holzbriketts: Bis zu 300 Prozent mehr Wärme pro Kilo

Many households stick with ordinary firewood simply out of habit. Look a little closer, though, and you’ll spot a fuel that can deliver significantly more heat from each kilogram, burn more cleanly, and take up far less space in the cellar. That fuel is densified wood briquettes - compressed leftover wood rather than chunky logs.

What’s behind densified wood briquettes

Densified wood briquettes are made from sawdust and wood offcuts produced by sawmills and furniture manufacturing. These remnants are dried and then compressed under extremely high pressure.

"Loose sawdust becomes a solid, dense fuel - with no glue, no chemicals, only the wood’s natural resin acting as the ‘binder’."

The result is compact cylinders or blocks that stack neatly, produce hardly any crumbs, and create a surprisingly steady flame when burned. In shops they’re usually sold under names such as “wood briquettes”, “compressed wood briquettes” or “wood heating briquettes”.

Up to 300 per cent more heat per kilo

The key advantage: calorific value

The standout benefit of briquettes is their very low moisture content. While air-dried logs often still contain 20 to 30 per cent moisture, good wood briquettes are typically below 10 per cent. Less water means more usable energy from every kilogram.

Typical figures compared:

Property	Wood briquettes	Standard logs
Calorific value	approx. 4.8–5.2 kWh/kg	approx. 2–3 kWh/kg
Moisture	< 10 %	20–30 %
Amount of ash	low	noticeably higher
Storage requirement	up to 4× less volume	large, needs plenty of space

In day-to-day use, that means you often need only a fraction of the fuel to achieve the same room temperature. If you’ve previously ordered whole stacked cubic metres of logs, you may get by with far fewer pallets of briquettes.

Clean, consistent combustion

Because briquettes are pressed to a uniform density, they burn far more predictably than a random mix of thick and thin logs. The flame tends to stay fairly constant, there’s less sparking, and you get fewer clouds of smoke at the lighting stage.

"Less smoke means the flue gets tarred up more slowly, the stove glass stays clear for longer, and fine particulate emissions fall."

Especially in closely built-up residential areas, this can noticeably improve local air quality - and help avoid arguments with neighbours when the wind is blowing the wrong way.

A space-saver in the cellar or garage

Anyone living in a semi-detached house or a rented flat with a stove knows the usual headache: where do the logs go? Wood briquettes solve that storage dilemma in a straightforward way.

• Compact shape: cylinders or blocks stack like building bricks.
• Less volume: for the same amount of energy, you need roughly a quarter of the storage space compared with logs.
• Cleaner to store: no flaking bark, far fewer pests, and much less wood dust.

They’re typically supplied in plastic-wrapped packs or cartons you can carry much like a crate of drinks. If you don’t want a huge pile in the garden, briquettes are often the lower-fuss option.

How wood briquettes are made - and why it makes ecological sense

From an environmental point of view, wood briquettes make use of a raw-material stream that exists anyway: sawdust, planing shavings and smaller wood leftovers. Without this route, the material would need disposing of or would be burned with poorer efficiency.

The usual process:

• Wood residues from sawmills and industry are collected.
• The material is dried until the moisture content is very low.
• Large presses compress the particles under high pressure into solid briquettes.
• The finished products cool down, are packaged and shipped out by the pallet.

Because no additional binding agents are required, the fuel remains purely wood-based. As with standard firewood, the CO₂ balance depends on forestry practices - but using residual materials means forests are not being felled specifically for briquette production.

How to use wood briquettes correctly in a fireplace or stove

Lighting: small first, then dense

Wood briquettes need heat to get going cleanly. If you treat them like lightweight kindling, you’ll be disappointed - they take longer to catch. The following approach has proven reliable:

• Build a strong starter fire using small, very dry logs and a firelighter.
• Only once you have a stable bed of embers, add one or two briquettes.
• Set the air supply slightly higher at the beginning until the briquettes are burning strongly.

Many users find that, after a short adjustment period, they need to refuel far less often - a briquette will frequently burn much longer than a standard log.

Setting the air controls properly

Because the fuel is so dense, the fire responds more sharply to too little or too much air. Too little air produces a dark, sooty flame; too much air drives the fuel through unnecessarily quickly.

Rules of thumb for everyday use:

• Open the air fully when lighting.
• Once the briquettes are glowing well, reduce the air slightly.
• Make adjustments in small steps and watch the burn for a few minutes each time.

What are the downsides - and who benefits from switching?

Despite the many advantages, wood briquettes won’t suit every home or every appliance. It’s worth checking three points first:

• Price: the cost per kilogram is usually higher than loose firewood bought directly from a woodland owner. However, when you compare energy per pound, it often works out similar - or even cheaper.
• Availability: in rural areas with lots of woodland, logs are often easier to source, whereas briquettes are more commonly found at DIY stores or fuel merchants.
• Appliance suitability: some older fireplaces or open hearths are designed around logs. In those cases, check with your chimney sweep or consult the stove manual beforehand.

For owners of modern wood-burning stoves who want convenience, less mess and predictable heat, wood briquettes are often a very appealing option. If you already have fuel delivered by the pallet, it’s easy to try both and compare.

Practical tips for storage and buying

To make the on-paper advantages show up in real life, storage matters. The crucial rule is simple: keep them dry. Even a few weeks in a damp corner can be enough for briquettes to swell and crumble.

• Choose a storage spot that is dry, well ventilated and protected from splashes.
• Don’t place pallets directly on the floor; set them on battens or Euro pallets.
• Only open the packaging film at the top and keep the sides as closed as possible.

When buying, it’s worth checking certifications and the information printed on the pack. Reputable manufacturers state moisture content, calorific value and the wood species used. Mixes of softwood and hardwood often provide a good balance between a quick flame and long-lasting embers.

What many people don’t realise: impact on health and neighbour relations

Burning the wrong wood - or wood that’s too wet - is one of the biggest contributors to wintertime fine particulate pollution. Briquettes with a low moisture content reduce that effect substantially, particularly in modern stoves with well-designed air controls.

"Less smoke from the chimney isn’t just more efficient - it also reduces strain on the airways of children, older people and those with pre-existing conditions."

In some local authorities, guidance and restrictions around wood stoves are increasing. If you can then demonstrate that you’re using a high-quality, dry fuel, you’re in a much stronger position during inspections.

Practical takeaway: when switching is especially worthwhile

Wood briquettes become particularly attractive for households that:

• have very limited storage space,
• run the stove daily or frequently,
• want to heat as cleanly and with as few emissions as possible,
• are willing to pay a bit more per kilogram if the energy yield is right.

If you’re unsure, order one or two packs for a trial rather than a full pallet. That way you can quickly see, in your own stove, whether the fuel suits you better than classic logs - and whether the promise of “up to 300 per cent more efficient” is something you can actually feel in your living room.