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- Always burn well seasoned firewood (ideally air-dried for at least 12 months). Freshly felled ('green') timber produces less heat, more smoke and tar deposits in the chimney.
- One tonne (1000kg) of green timber will contain between 250kg – 650kg of water.
- Dry oak timber is approximately 750kg per cubic metre compared to most coniferous species, poplars and willows, which range from 350kg to 600kg per cubic metre.
- The burning properties of each species are also important (see timber facts page). The modern stoves exhibit 70 - 85% efficiency compared to open fires giving 30% efficiency.
- At current prices, the price (per unit of energy) of firewood is far cheaper than natural gas or heating oil.
- An average three bed roomed house would need 7-9 tonnes of air-dried wood to provide all the heating requirements.
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