Still the longer the better and you can always check with a moisture measuring gauge. Soft wood has to be stored for at least 2 years, hard wood for at least 3 years. With small pieces of firewood, you create a greater surface and gasification area. The bark on wood is difficult to ignite, that is why it is always advisable to split firewood, this also speeds up the drying process. The thermal value at 15 % moisture content is approximately 4,1 kW per Kg. The thermal value of 100 % dry firewood is 5,1 to 5,3 kW per Kg, ( not naturally occurring ) A cubic metre of fire wood down to 20 % moisture still contains 200 litres of water and that is the maximum content in order to burn clean and also produce heat. Dry seasoned fire wood has a moisture content of 12 to 20 %, of course the drier the better. Green firewood can have a moisture content of over 50 %. Moisture left in the fire wood absorbs an amazing amount of the heat produced in the burn cycle as well as sooting up the chimney and flue ducts in the stove. More important than the variety of firewood is the moisture content of firewood. There is no risk for the sparks of soft wood while the fire is controlled behind a door in an enclosed environment, returning an efficiency of between 80 and 95 % to the stone mass. The quick burst of heat of dry soft wood ( birch, spruce, willow, larch, etc ) is no problem at all in a heat accumulating stove because the fire only needs to burn for a few hours in order to store a day of radiant heat. When you burn hard wood preferably mix with soft woods.
However in heat accumulating stoves and fin ovens, fast burning timber is more suitable. This is true to some extend in open fireplaces. Some people have a preference for hardwoods because of flame patterns and lasting glowing embers. As it dries in the summer sunshine, you’re collecting interest.’ Varieties of Firewood. ‘T’s been said that a long straight row of firewood standing in the yard in springtime is like money in the bank.
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