When properly seasoned, hackberry wood is almost identical to elm and you should expect a similar qualities and heating value. It is considered a good wood to burn overall, but can be prone to rotting. I would not suggest burning this wood as it nears two years of seasoning as this will create creosote and excessive smoke, leaving a dirty stove and creosote-filled chimney. As is the case with all wood for burning, please stack the wood off the ground and cover the top two thirds with a tarp and let this wood sit for at least 6 months prior to burning. I would suggest purchasing a Moisture Meter
to ensure that the wood you intend to burn has between 15% and 20% moisture content.