Wood Briquettes: More Heat for Your Money and the Environment

For winter heating, most people tend to think of traditional firewood bought from a builders’ merchant or supplied by a forestry worker. However, another fuel is now becoming increasingly popular: highly compressed wood briquettes made from sawdust and wood shavings. They may not look particularly remarkable, yet they can make a substantial everyday difference to both household budgets and the environment.

What compressed wood briquettes are made from

Compressed wood briquettes, also known as pressed-wood or fireplace briquettes, are produced from dry sawdust and leftover wood material compacted under extremely high pressure. No glue is added, as the wood binds together through its natural lignin structure.

The result is a very dense, consistently manufactured fuel with clearly defined characteristics. Unlike conventional logs, there are few surprises regarding moisture levels or the type of wood used.

“Because of their high compression, wood briquettes can provide up to 300 per cent more usable heat per kilogram than many conventional logs.”

This predictability is precisely why a growing number of households are replacing at least some loose firewood with briquettes.

Why pressed wood performs far better in a stove

High energy density rather than ‘air in the wood’

The key factor is calorific value. Compressed briquettes generally achieve around 4.8 to 5.2 kWh per kilogram. Even well-seasoned firewood often reaches only about 2 to 3 kWh per kilogram.

• Briquettes: around 4.8–5.2 kWh/kg
• Traditional firewood: around 2–3 kWh/kg

This is mainly down to moisture content. Briquettes usually contain less than 10 per cent moisture, whereas ordinary firewood, even when stored properly, is more likely to contain 20 to 30 per cent. Water in the wood must evaporate before the stove can heat efficiently, using energy that would otherwise warm the room.

Clean, consistent combustion

Since briquettes are so dense and uniform, they burn more steadily and predictably. They create less smoke, less flickering and fewer sparks. Anyone with a fireplace featuring a glass door will notice that the glass stays clean for considerably longer.

The chimney also benefits. Less soot and tar means fewer deposits, which in turn reduces the risk of chimney fires and lowers cleaning costs.

Less ash and fewer trips carrying fuel

Their high calorific value means less ash remains once the fuel has burned. This reduces the work involved in emptying the stove and cuts down on dust in the living area. At the same time, less fuel is simply needed to produce the same amount of heat.

“Anyone who previously needed a trailer full of logs can achieve similar heating performance with roughly a quarter of the volume in briquettes.”

A space-saving option for the cellar: storage and handling

Storage requirements are another advantage. Compressed wood briquettes make efficient use of available space. Supplied in manageable packs, they can be stacked like bricks and do not fall apart.

For households without a large garage or shed, this is a genuine benefit. As a rough guide, briquettes take up only around a quarter of the space required by logs for the same amount of energy.

How to store briquettes correctly

• Keep them dry and well ventilated, for example in a cellar or beneath a canopy.
• Do not place them directly on a damp floor; use a pallet or wooden battens instead.
• Open the plastic wrapping only partly so that any residual moisture can escape.

Provided the packs stay dry, they can generally be stored for several years without any notable loss of quality.

How pressed wood compares with firewood

Feature	Compressed wood briquettes	Traditional firewood
Calorific value (per kg)	approx. 4.8–5.2 kWh	approx. 2–3 kWh
Moisture content	< 10%	20–30%
Storage space needed	very low	considerably higher
Ash volume	low	noticeably higher
Environmental balance	good (use of leftover wood)	heavily dependent on forestry practices

From an environmental perspective, briquettes score well because, ideally, they are made from residual materials that would otherwise need to be disposed of. Sawdust, planing shavings and industrial wood offcuts are therefore given a second use.

How to use briquettes properly every day

In practical use, briquettes differ slightly from conventional logs. Following a few basic points makes them straightforward to use.

The best way to light a fireplace or stove

• Start the fire with firelighters and small pieces of very dry wood.
• Place one or two briquettes on the fire only once a stable bed of embers has formed.
• Initially leave the air supply more open until the briquettes are burning properly.

Briquettes require a slightly higher starting temperature, but then burn for a long time and at a steady rate. Many users get used to adding just one briquette in the evening instead of continually putting several logs into the stove.

Air control: the key to efficiency

Managing the air supply carefully helps get more from the fuel. Too much air causes briquettes to burn away quickly, while too little produces smoke and incomplete combustion. It is worth carrying out brief tests with different settings on your own stove.

Drawbacks of briquettes – and who they suit

There are, of course, disadvantages too. Briquettes usually appear more expensive to buy than a cubic metre of firewood. Once calorific value is factored in, however, the difference is often balanced out or may even favour briquettes.

• Higher unit price: You pay more per pack, but use less fuel overall.
• Local availability: In rural areas with established firewood supplies, briquettes are still less common in some places.
• The feel of a real fire: Some fireplace enthusiasts miss the familiar crackling and irregular flames produced by logs.

Nevertheless, briquettes can be the more sensible option for people with limited storage space, no dedicated wood store, or greater heating needs during winter.

Where to buy the fuel and what to look for

Builders’ merchants, heating-fuel suppliers and many online retailers now sell a range of wood briquettes. The choice can quickly seem confusing, but quality differences are real.

Quality features buyers should check

• The stated calorific value in kWh/kg
• Moisture content, ideally < 10 per cent
• The origin of the wood, such as PEFC- or FSC-certified sources
• Clear confirmation that no chemical binding agents have been used

It is worth buying one or two packs as a trial before ordering an entire pallet. This allows you to see how your own stove performs and how the heat feels throughout the home.

What consumers should also know

The term “calorific value” repeatedly causes confusion. What matters is not the volume of a stack of wood, but the amount of energy per kilogram and how much of it actually reaches the room. Wet wood wastes a large proportion of its energy as water vapour going up the chimney.

Those seeking a combination of convenience and low emissions can pair briquettes with other measures, such as a hydraulically balanced heating system, good insulation, or support from a heat pump or solar thermal system. The more efficiently the home works overall, the greater the effect of high-quality fuels on heating bills.

The main risks arise from incorrect use: adding too much fuel at once, closing the air supply, or having an inadequate flue draw. Guidance from a fireplace installer or chimney sweep, together with checking the stove’s operating manual, prevents damage and ensures briquettes can genuinely deliver their full potential.