25kg bag of Smokeless Anthracite Large Nuts Welsh Anthracite Large Nuts is a natural smokeless fuel, ideal to be used in cookers, boilers, & other closed appliances. Anthracite nuts pack together tightly to create an intense & long lasting fire bed which is popular with those looking for efficient heat. Anthracite Nuts are a high performance fuel which burn with a high heat & low flame, & leave little ash behind. Suitable for burning in smoke control areas.