You’ve invested in a lovely new multi-fuel stove and you are wondering now what fuels to use. Multi-fuel stoves, unlike woodburners, have a grate that allows air to flow under the fuel allowing you to burn coal as well as wood.
Your flexible liner will have been designed to withstand the heat and to hold the soot caused by burning these fuels, providing you burn seasoned wood only, and get your chimney swept regularly. This may mean every 3 months if you use your appliance a lot! If you are wanting to burn smokeless coal you should check the thickness of the liner that you have had installed. You will find this information on your data plate and reciept form the installer. Smokeless fuel is more acidic and is quick to corrode the steel liner, so if you have a 316/316 liner installed, keep away from smokeless! Also keep an eye on your stove thermometer so that you keep out of the ‘soot zone’ by burning cleanly above 300 degrees.
Make sure that when you burn wood that you don’t burn items straight from the garden. It takes around 2 years for the water content to fall to levels that are acceptable for burning. This drying process is called ‘seasoning’.
Burning unseasoned wood is one of the reasons woodburners are getting bad press at the moment, because of the air pollution it causes. The Government has started up a certification scheme for wood and log suppliers so that the sale of unseasoned wood can be brought to an end. Look for the ‘WoodSure’ Logo when finding a supplier.
Burning unseasoned wood and / or household items that are no longer needed such as packaging, furniture, clothing is all damaging for both the environment and your appliance. It will cause creosote and sticky tar to form in the stove and also the liner. When it dries it is solid and incredibly difficult and costly to remove. In the image below it is so thick that it has blocked the flue and severely reduced the airflow, making the stove impossible to use.
It’s also very flammable, and can cause your chimney to set on fire. All in all, it’s best to keep rubbish in the bin and seasoned wood and coal in your beautiful woodburner.