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Wood Burning Fires Need to Be Hot and Clean Wood burning fires are not just a relaxing and enchanting experience, but they're a critical element of our wellbeing and health. They must be hot and clean to be effective. Unseasoned, or green, wood has a high moisture content which makes it difficult to light and burn efficiently. Kiln dried or seasoned wood has a lower moisture content, making it much easier to light and maintain a fire. Efficient Combustion The wood fire must be sufficiently hot to burn off moisture and reach temperatures of over 540