*Please note this fuel must be mixed* CAUTION - very hot! Due to its heat output, Wonderco MUST be mixed with other fuels. If burnt on its own, it will damage your stove or grate. When mixed with another fuel, this fuel gives a very high heat output and produces very little ash.Mix recommendation: 40% Wonderco / 60% coal. Although this is a Smokeless Fuel, it is NOT suitable for use in smoke control areas.