Perfect firewood quality. Stoves are best fuelled with wood types such as beech, oak and birch, since hardwoods have a higher fuel value, burn more consistently and produce less combustion noise than coniferous woods, such as spruce or fir, which, in contrast, are outstandingly suitable for lighting a fire. They burn faster and produce greater heat in a shorter time than hardwood woods. Independently of which wood you are using, the drier the fuel wood, the more cleanly it will burn and the higher the energy yield. Therefore, only natural, air-dried wood with a maximum residual moisture of 20% (in ideal case 15-17%) must be used. Chipboard, painted or coated foods must never be used as a fuel.