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How to use a charcoal barbecue: chimney, zones, vents

Updated: 23 October 2026

You already own a lidded charcoal barbecue, and the problem is not which ASIN to buy. The fire is either out or roaring, and you are tempted to splash something flammable on cold coal. How to use a charcoal barbecue comes down to three habits: light outside with a chimney and recognised cubes, bank a two-zone fire, and move one vent at a time. Model rankings stay on the [charcoal barbecue comparison](/hub/grills-and-barbecues/charcoal-barbecue). Peter F. edits DIY and tools at Products Compared. Updated 23 October 2026. We did not run timed cooks on these listings. A qualifying purchase through our links can earn a commission at no extra cost to you.

You already own a lidded charcoal barbecue, and the problem is not which ASIN to buy. The fire is either out or roaring, and you are tempted to splash something flammable on cold coal.

Our top picks

CosmoGrill CosmoGrill XL charcoal smoker

Best overall

CosmoGrill CosmoGrill XL charcoal smoker
9.2/10about £159.99
View offer
Weber Weber Compact kettle 47 cm

Best value

Weber Weber Compact kettle 47 cm
9.0/10about £49.49
View offer
Big Smokey Big Smokey barrel barbecue

Alternative

Big Smokey Big Smokey barrel barbecue
8.8/10about £67.99
View offer
On this page
  1. 1.Light it outside with a chimney
  2. 2.Bank the coals for two zones
  3. 3.Move one vent, then wait
  4. 4.Add fuel without dumping the food

Light it outside with a chimney

GOV.UK’s outdoor fire advice is the baseline: about 5 cm of charcoal, recognised lighters on cold coals, never petrol or paraffin to start or revive a fire. Weber UK’s how-to puts a chimney starter on the charcoal grate, not on the lawn, over a few lighter cubes. When flames show at the top and the upper coals are ashed grey, pour the load into the bowl with heat-resistant mitts. Lighter fluid is a poor habit because the smell clings to food. Lumpwood lights faster and burns hotter; briquettes usually last longer. That contrast is Weber UK’s, not a lab result for a fuel in this hub. Keep children and pets clear while the chimney is roaring. Without a chimney, mound cubes under cold charcoal outdoors. A camping or portable title is not permission to light under an awning. If breathing trouble or a fire takes over, stop cooking and use the safety page.

Bank the coals for two zones

Direct heat is the hot half of the grate for a sear. Indirect heat is the cooler half, where food finishes with the lid on. Napoleon UK’s kettle set-up is a simple 50/50 bank: coals on one side, empty grate on the other, with a drip pan for longer cooks. Their count of about 50 briquettes is Napoleon’s starting point, not a rule for every bowl here. On a round kettle, picture the hot bank as a crescent and leave a cool landing for chicken or thicker sausages. A long barrel grate often holds a thinner coal bed under more food. BBC Good Food notes that coal can be easier to spread on a barrel than under a dome, which helps a row of burgers and does not invent a deep cool zone. If you are still choosing shape, the charcoal barbecue buying guide covers that. Vents cannot create a cool zone the coal bed never left empty.
CosmoGrill CosmoGrill XL charcoal smoker

Testsieger

CosmoGrill CosmoGrill XL charcoal smoker
9.2/10about £159.99
View offer

Move one vent, then wait

Weber UK treats the bowl vent as air in and the lid vent as air out. Start both open, then make one small move and wait about five minutes. Their kettle bands run from about 95°C to 290°C as the lid vent closes from open toward an eighth. Those bands are Weber’s guide, not a result for every cart here. Do not shut both vents while food is still cooking. A lid thermometer reads air under the lid. The Compact states none. The Original states one. Put the lid vent opposite the coal bank. After the cook, closing the vents helps smother the fire. Weber says cool overnight and discard after at least 12 hours. GOV.UK still wants cold ash on bare soil, not in a plastic bin.

Add fuel without dumping the food

Big Smokey’s listing states a sliding grill so you can reach the charcoal without tipping every burger off. CosmoGrill XL, CosmoGrill XXL and House of Home state adjustable or raising coal trays. Crank or lift the bed rather than fishing through the food grate. On a simple kettle, lift the cooking grate with mitts, add a few lit coals from a second chimney, and replace the grate. Unlit charcoal dumped on a dying fire is how people reach for paraffin. Light a small fresh load in the chimney instead. Do not leave the lid off for a long chat: heat leaves, fat flares, and the two-zone layout collapses. If the fire is too close to a fence, under an awning, or making someone dizzy, that is a safety stop. Where charcoal must not be lit, and what to call, is on charcoal barbecue safety.

Common questions

How do I light charcoal without lighter fluid?
Use a chimney starter over recognised lighter cubes on cold charcoal outdoors, then pour when the top coals are grey. GOV.UK bans petrol and paraffin for starting or reviving the fire.
How do I know the coals are ready?
Wait until the upper coals are covered in light grey ash and flames have settled at the top of the chimney. Pouring while liquid flame is still leaping is the spark risk Weber flags.
What is a two-zone fire on a round kettle?
Bank lit charcoal on one half of the charcoal grate and leave the other half empty. Sear over the coals, then move food to the empty side and put the lid on to finish.
Which vent do I move first?
After both vents start open, adjust one, usually the lid vent for fine control, then wait about five minutes. Do not close bowl and lid vents together while you are still cooking.
What temperatures are a starting point, and what are they not?
Weber’s lid-vent bands from about 95°C to 290°C are a kettle starting point from their UK article. They are not a lab certificate for every grill in this comparison, and they are not food doneness temperatures.
How do I add charcoal mid-cook on a barrel with a sliding grate?
Slide or open the access the listing gives you, add a few already-lit coals, and close up again quickly. Avoid dumping a cold bag onto dying embers and never revive with petrol.
Why does the lid gauge not tell me the chicken is done?
It measures air under the lid, not the thickest part of the meat. Use a food probe or a clear cook-through check for poultry and burgers.

Related pages

Kettle vs barrel barbecue

Charcoal barbecue

Best charcoal barbecue: who each saved pick is for

Charcoal barbecue buying guide: shape, grate, vents

Charcoal barbecue safety: where you must not light

Sources

Public UK sources used for this comparison. Listing prices, stars and review counts are the amazon.co.uk figures for these ASINs. Retrieved 22 October 2026.

  1. GOV.UK: fire safety outdoors (retrieved 22 October 2026)
  2. NHS: carbon monoxide poisoning (retrieved 22 October 2026)
  3. GOV.UK: smoke control areas (retrieved 22 October 2026)
  4. BSI: BS EN 1860-1:2024 solid-fuel barbecues (retrieved 22 October 2026)
  5. BSI: BS EN 1860-2:2023 barbecue charcoal (retrieved 22 October 2026)
  6. Weber UK: how to use a charcoal barbecue (retrieved 22 October 2026)
  7. BBC Good Food: how to light a barbecue (retrieved 22 October 2026)
  8. legislation.gov.uk: Consumer Rights Act 2015 (retrieved 22 October 2026)