Softwood vs Hardwood: Which Burns Longer For Heat?

Type and Density Matter

When it comes to burning firewood for heat, the type and density of the wood play a significant role in its burning duration. Hardwoods, such as oak and maple, typically have a denser structure and higher BTU content than softwoods, like pine and spruce. This density and BTU content translate to a longer burn time and more consistent heat output.

BTU Content by Species

A rough estimate of BTU content per cord of firewood is as follows: oak (18-20 million BTU), maple (19-22 million BTU), and ash (18-20 million BTU) are high-BTU hardwoods. In contrast, softwoods like fir (15-18 million BTU) and spruce (14-16 million BTU) have lower BTU content. Keep in mind that actual BTU content can vary depending on moisture levels and other factors. It’s essential to measure and record your firewood’s moisture level, which affects burn efficiency and BTU output.

Proper Harvesting and Preparation

To ensure your firewood burns efficiently and effectively, proper harvesting and preparation techniques are crucial. When felling trees, use a chainsaw with a sharp blade and maintain a safe working distance. Buck the tree into manageable sections, and split the wood to increase surface area for drying. Seasoning firewood for at least six months, ideally with a moisture level below 20%, will help optimize burn time and heat output. This process involves stacking the wood to allow for airflow and monitoring the moisture level regularly.