If you use wood then make sure it is well seasoned hard wood and that it is dry. Poor quality wood increases the build up of tar and can encourage chimney fires. Check that your appliance and flue are suitable before burning any other solid fuel such as coal. Some stoves are supplied as wood only and need an additional coal grate to be fitted before burning fossil fuels.
If your flue has been fitted in the last few years there should be a dataplate nearby or possibly in the electric meter cupboard and this will tell you what the fire and flue are suitable for.
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