Burning wood correctly could greatly reduce your fuel costs. When sourcing wood, the most important factor to remember is moisture content. Damp firewood can have up to three times less output compared to seasoned wood.
The examples below demonstrate the comparative cost per kilowatt of energy depending on the moisture in the wood:
60-90% moisture = 1.0kW/h per kg
30-50% moisture = 3.0kW/h per kg
<20% moisture = 4.5kW/h per kg
The below diagram outlines how moisture levels effect efficiency:
To ensure you get optimum levels of moisture, read our article on seasoning wood and digital moisture meters.