What Log Length Do I Need for My Stove?

How do I find the right log length?

1. Check the manual. Stovax says the maximum log size for its stoves is given in the user's instructions, and that it's specific to the size of stove and model. Most makers also list it on the product page.
2. No manual? Measure the firebox. Measure the inside from side to side and front to back, where the logs sit. Allow room at both ends: Morsø says logs should be short enough to lie flat over the embers with air at both ends.
3. Check the logs sit clear of the glass. Morsø says to avoid wood so long that it presses against the glass when the door is closed.
4. Split thick logs. Thinner logs burn more cleanly. See the thickness advice below.

Maximum log lengths for popular stoves

Figures from each maker's manual, spec sheet or product page. Check your own model, as sizes change between versions.

How thick should logs be?

Thinner than most people think. Burnright says 100 to 150 mm across is best, and its log size page explains that a big log has less surface for its volume, so less of the gas burns, which means lower efficiency and more emissions. Stove makers often go smaller:

• Stovax: logs no more than about 10 cm across, and 75 mm in its Stockton manual.
• Charnwood: 75 mm in its C-Four manual.
• Morsø: 8 to 12 cm, and always split anything over 10 cm.

Follow your manual where it gives a figure.

What happens if logs are too long or too big?

• Black glass. Stovax lists a fire that touches the glass as a cause of blackening, and Charnwood says logs overhanging the front fence will blacken it. See how to clean log burner glass.
• Blocked air. Stovax says not to load fuel above the log guard and the air inlets at the back of the firebox, and Hunter says to keep wood below the top of the rear brick.
• Smoke. Stovax says overloading can cause excess smoke, and Burnright says an overloaded stove sends large amounts of smoke up the chimney.
• Damage. Woodwarm warns not to overload, as heat damage can occur.

Does log size matter in a smoke control area?

It can. An exempt stove is approved to burn a stated fuel, and some listings set the log size. Defra's listing for one exempt stove allows dry, split logs up to 25 cm long and 10 cm across. See Defra exempt stoves explained.

Will your logs fit my stove?

Our logs are cut to a consistent size for easy stacking. If you're not sure they'll fit, check your stove's maximum log length and give us a call with the make and model before you order.