If you own a wood-burning or a multi-fuel stove, the type of firewood you use makes a huge difference – not just in terms of heat output, but also stove efficiency, fuel economy, and emissions. Two common types of firewood are kiln-dried logs and seasoned logs, but what’s the difference between them, and which one is better for your stove?
What Are Seasoned Logs?
Seasoned logs are logs that have been naturally air-dried over time to reduce their moisture content. Freshly cut logs are stacked and left to dry outdoors, which takes typically 12 to 24 months depending on the wood type, climate, and storage conditions. Good air circulation and protection from rain are essential to proper seasoning. The aim of seasoning logs is to bring down the moisture content to under 20%. The pros of seasoned logs is that they are natural and cost effective, although the moisture content is not always consistent, therefore you should always use a moisture meter prior to lighting up a fire. Logs with an excessive amount of moisture will burn less efficiently and produce more smoke and creosote (which can clog your flue and potentially lead to a chimney fire).
What Are Kiln-Dried Logs?
Kiln-dried logs are logs that have been artificially dried in a kiln – a specially controlled chamber that removes moisture from the wood quickly and uniformly. The process usually takes a few days to a couple of weeks to achieve the moisture content dropping to below 20%, often as low as 10–15%. Although kiln dried logs may be more expensive than seasoned, due to the low and consistent moisture content, they burn slightly hotter than seasoned logs and can produce less smoke, tar, and creosote – making them cleaner for the environment and better for your stove’s efficiency and longevity.
In the UK, look for firewood that carries the “Ready to Burn” certification. This means the logs have been tested and approved to contain less than 20% moisture – whether they’re kiln-dried or well-seasoned. Using certified wood helps to meet legal requirements (especially in Smoke Control Areas), keeps your stove efficient and clean and will reduce environmental impact.