How Long Does 20kg of Firewood Last?
The duration of 20kg of firewood depends on factors such as the type of wood, its moisture content, and how efficiently it’s burned. For a typical 5kW Log Burner, seasoned hardwood can provide heat for 3–4 hours of continuous use, while softwoods burn faster. For casual use, 20kg might last a few evenings, but frequent or intense burning will consume it more quickly. Proper storage and efficient burning practices can significantly extend its duration.
How Long Does 20kg of Firewood Last?
Burning firewood efficiently requires an understanding of how wood type, moisture content, and appliance efficiency affect burn time. This guide provides practical insights to help you maximise the warmth and efficiency of your 20kg firewood supply.
Factors Affecting Firewood Duration
Type of Wood
- Hardwoods (e.g., oak, birch): Dense and slow-burning, hardwoods are ideal for producing steady heat over longer periods.
- Softwoods (e.g., pine): Burn faster and hotter, making them better suited for kindling or short bursts of heat.
Moisture Content
- Seasoned Wood: Low moisture content (15–20%) ensures efficient burning, producing more heat and less smoke.
- Wet Wood: Inefficient and smoky, wet wood wastes energy as the water content evaporates.
Fire Intensity
- A roaring fire burns wood faster, while a steady flame conserves it.
- Adjusting airflow helps balance the burn rate and heat output.
Appliance Efficiency
- Modern Stoves: Extract maximum heat and burn wood more efficiently, extending its duration.
- Open Fireplaces: Lose a significant amount of heat up the chimney, requiring more wood for the same warmth.
Estimating Firewood Consumption
Casual Use
For occasional fires to create a cosy atmosphere, 20kg of seasoned hardwood might last 3–4 evenings, burning for a few hours each night.
Frequent Use
If used as a supplemental heat source, 20kg might last 1–2 days of consistent burning in a 5kW stove.
Intense Use
In primary heating setups, particularly during colder months, 20kg of firewood may only last a single day.
Tips for Maximising Firewood Duration
Store Properly
- Store wood in a dry, ventilated area to maintain its low moisture content.
- Stack off the ground and cover the top to protect against rain, ensuring air can circulate.
Use Kindling
- Start fires with small, dry pieces of wood or kindling to ignite larger logs effectively.
Control Airflow
- Adjust vents on stoves or fireplaces to manage the burn rate.
- A slow, controlled burn uses less wood and produces consistent heat.
Choose the Right Wood
- Prioritise seasoned hardwoods for longer, efficient burning.
- Avoid damp or freshly cut wood, as it reduces heat efficiency and creates creosote.
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