Good Practice / Bad Practice
This section of the website will provide suppliers and consumers with examples of good practice and bad practice when selling or buying wood fuel.
Logs are easily available, especially in rural locations or from your own woodland or wood supply. They can now also be obtained from many suppliers in towns and cities.
The moisture content of the timber should be below 25% (air dried); otherwise your boiler will produce steam.
Pellets have a moisture content of 6 to 10% and need less storage than logs or chips as they have a higher calorific value for the same volume. Pellet systems are generally fully-automated, with the pellets sucked by vacuum straight into the boiler from the store.
Wood chip is timber that has been shredded in a chipper. It is an easy fuel for automation, with a conveyor belt or screw-feed taking the chips straight from the store into the boiler. Like logs, the chipped material needs to be dried to achieve low moisture content, ideally under 25%.
Chip systems are inexpensive to run, however initial capital outlay is greater than other technologies. This is because it has some additional parts that make the boiler fully automated. This means it will start on demand according to your pre-determined time settings in much the same way as a conventional gas boiler would.
Interest-free Carbon Trust loans and the Renewable Heat Incentive do make this an attractive technology for larger premises and those with their own fuel supply.