Expert Guidance from ProSweep Devon
When it comes to running your stove efficiently and protecting your chimney system, choosing the right fuel makes all the difference. Although many appliances are marketed as multi‑fuel, mixing fuels isn’t as beneficial as it sounds. At ProSweep Devon, we help homeowners understand how to burn safely, efficiently, and in a way that prolongs the life of their flue.
Wood and Coal Burn Differently
Wood and coal require completely different airflow to burn properly:
- Wood burns best with air supplied from above.
- Coal needs air from below, through a grate.
Multi‑fuel stoves include a grate to accommodate coal, while wood‑only stoves have a solid base. When you mix fuels, they compete for the same air supply, which leads to poor combustion and increased residue.
Why Mixing Fuels Damages Stainless Steel Liners
The biggest issue with burning wood and coal together is the chemical reaction inside your flue.
- Coal releases sulphur.
- Wood releases moisture — even seasoned logs contain around 20% water.
When sulphur and moisture combine, they form a highly acidic deposit. This residue is known to corrode stainless steel liners, reducing their lifespan and increasing the risk of expensive repairs.
The Problem with “Slumbering”
Slumbering — turning your stove’s air controls right down to make the fuel last longer — causes the fire to burn at a low temperature. This leads to:
- Excess moisture
- Tar and creosote buildup
- Higher risk of chimney fires
- Faster liner deterioration
Even burning a single fuel at low temperatures can cause problems, but mixing fuels makes the issue worse.
ProSweep Devon’s Recommendation
To protect your stove and flue system:
- Use one fuel at a time, even in a multi‑fuel appliance.
- If you’re in a smokeless zone and your stove is not DEFRA‑exempt, you must use smokeless fuel.
- If you’re outside a smokeless zone or have a DEFRA‑exempt stove, you may choose either wood or smokeless fuel — but avoid mixing them.
For best results, burn your chosen fuel hot and clean. A simple stove thermometer can help you stay in the ideal temperature range.
Keep Your Chimney in Top Condition
Regular sweeping is essential for:
- Preventing tar and creosote buildup
- Improving stove efficiency
- Protecting your liner
- Reducing the risk of chimney fires
ProSweep Professional Chimney Sweep is approved by Devon Trading Standards Buy With Confidence offering a professional and personal chimney sweep & stove flue service in Newton Abbot, Torquay, Dawlish, Teignmouth, Bovey Tracey, Chagford and surrounding towns and villages. Give us a call 01626 832051