Wood fuel can be from hardwood or softwood tree species (or mixed).
Hardwoods - deciduous, broadleaved tree species, such as Oak, Ash, Birch – are generally better as firewood as they tend to be denser and burn for along period of time.
Softwoods - evergreen, coniferous species such as Spruce – tend to light more easily and can be good for kindling but are less dense so will burn faster and compared to a similar sized hardwood log will provide less heat.
A tonne of dry hardwood logs will occupy a smaller space than a tonne of dry softwood logs.
Different logs will require different amounts of time to get fully seasoned and ready for burning.
Wood felled in the summer contains more sap so will take longer to dry.
DO NOT burn treated waste wood (eg old furniture, pallets or fence panels) or household rubbish
Treated waste wood and household rubbish can emit harmful fumes and toxic pollutants, such are arsenic, into your home when burnt.