The hottest burning wood is Hardwood. Hardwoods like ash, birch, oak, maple, and most fruit trees are the best burning woods that will give you the hottest and longest burning time.
Make sure your wood is dry. Do not burn green or insufficiently dried wood. It produces less heat and more smoke – creosote than the well dried or seasoned wood.
It is important to use only the firewood that burns well and produces a good amount of heat, as we have seen above. However, you ought to avoid using woods because they will not give you a good amount of heat and will instead produce a lot of smoke.