Beech is a densely grained wood that makes a good burning fire. Beech is difficult to split because of its denseness. However, it will dry much faster and more thoroughly when split.
The bark on a tree acts as a sealer, delaying the moisture from leaving unsplit wood. When branches under 4 inches are split for drying they then make good kindling wood.
Properly stacked under a dry shelter, beech takes about 12 months to fully season. Keeping a constant air circulation over the stacked wood with a large fan reduces the time to about 6 months. If the storage area is enclosed, adding even a small heat source further reduces the time to a few months.
If beech is not seasoned well the wood will burn poorly and with low heat. Wetter wood actually burns faster than dryer wood, so more wood is needed just to maintain a fire.