Wood Briquettes versus Logs
They burn hotter and cleaner, are cheaper to buy, and much easier to store and handle – so why do so few people with open fires and wood-burning stoves use recycled wood briquettes to heat their home?
Big in Europe, but still largely untried by many fire users in the UK – particularly in the south – those selling them claim that once you have tried briquettes, you’ll never go back to hauling piles of logs off your drive.
Briquettes deliver around 50% more heat for each pound spent than logs. They also have strong environmental credentials as they are made from waste wood produced as part of the furniture or other wood-related businesses – or in some cases collected from skips. Burning wood is generally considered a low-carbon alternative to fossil fuel because trees absorb carbon as they grow. The Environmental writer Chris Goodal has done the sums and heats his home using wood pellets – similar to briquettes – made from UK wood. The Drax coal power station burns pellets shipped from the US on the basis that the carbon savings are more than 80% once the life cycle of the trees are taken into account.
Briquette producers take sawdust and other shredded wood, apply 10,000psi (pounds per square inch) of pressure, and out pop briquettes. They are almost entirely natural – the lignin molecules in the wood melt under the pressure and bind the wood chip and dust together. They come in a variety of shapes from a number of providers, and in initial tests by Guardian Money they perform fantastically well in wood-burners. One briquette can last up to four hours, and big users will find they save around £150 a year compared to buying conventional logs.
Rowland Parke, director of the Dumfries-based Wood Fuel Co-operative says people in the UK are finally starting to wake up to the benefits of briquettes. “We are selling more and more of them, particularly in the past year or so. Once people try them they soon stop buying logs locally. They are cleaner and easier to store, and take up around half the space of a log pile. Until you have tried one you won’t believe how much heat they can deliver,” he says.
The moisture content of most briquettes is 10% or less, meaning they burn better and cause fewer chimney and flue problems. Logs sold in the UK generally have much higher levels of moisture – 20% in well-seasoned wood, and up to 50% in other cases, Parke says.
The co-op was set up by a group of like-minded people to gain bulk-buy discounts. It started selling briquettes in 2012, and they are now its biggest seller. Parke says some of the briquettes come from the Verdo plant 90 miles away in Grangemouth, but the majority arrive by ship from eastern Europe – particularly Latvia and Estonia.
Stuart Fitzgerald, managing director of online supplier White Horse Energy is another big fan. “Until recently you could draw a line across the UK: southerners all ordered nice-looking kiln-dried wood, while all our briquette orders came from the north. Now that’s changing, partly because of a growing awareness that briquettes can deliver more heat for the money.”
He says you have to keep them in a dry place as if they expand rapidly if they get wet. When they burn they leave around 1% of their original volume as ash, meaning you don’t have to empty the stove as often.