By the UK Wood Gasifier Hub – Off-Grid Power & Biomass Energy Guides Team · Updated May 2026 · Independent, reader-supported

Best Wood Fuel Sources for Home Gasification UK: Where to Buy & What to Avoid

Wood gasifiers have become increasingly popular for UK homeowners looking for efficient heating and energy independence. But the fuel you choose makes an enormous difference to how well your gasifier performs—and whether you're wasting money burning damp wood or operating at peak efficiency. Here's what you need to know about sourcing the right fuel.

Why Wood Quality Matters for Gasification

Unlike an open fire or standard log burner, gasifiers are fussy about their fuel. They work by heating wood in a low-oxygen environment to produce combustible gases, then burning those gases. This process is efficient only when the wood is dry enough to heat properly and dry enough to avoid excessive moisture loss during the process.

Wet wood wastes heat evaporating moisture instead of converting it to gas. Your system runs cooler, less efficient, and produces more creosote and tar deposits that damage the equipment. You'll also get significantly less usable energy per tonne of wood, which defeats the point of installing a gasifier.

Kiln-Dried Hardwood Logs

Kiln-dried hardwood is the gold standard for gasifiers. This is timber that has been mechanically dried in a kiln to bring moisture content down to around 12-20%—significantly lower than air-dried logs.

Where to source kiln-dried logs:

Look for specialist timber merchants and firewood suppliers rather than garden centres, which often stock lower-grade fuel. The best suppliers publish their moisture content figures; ask for copies of test certificates if they don't volunteer them. Most reputable merchants supply logs in 25kg sacks or dumpy bags, and some offer local delivery for a reasonable fee if you're buying in volume.

Hardwood species like oak, ash, beech, and birch are ideal. Oak is particularly valued for gasifiers despite being harder to split—it's dense, splits cleanly when properly seasoned, and produces excellent gas output. Ash is more forgiving to work with and nearly as good. Avoid softwoods like pine and spruce; they contain resins that create excess tar.

Cost and availability: Expect to pay £150–250 per tonne for quality kiln-dried hardwood, depending on species and whether you collect or arrange delivery. It's more expensive than air-dried logs, but the efficiency gain justifies it for gasifier use.

Air-Dried Logs (With Caution)

Genuinely air-dried hardwood logs—dried for at least 18 months to 24 months under cover—can work in gasifiers if properly stored after purchase. The catch is verifying that they're actually dry enough. Many suppliers claim logs are "seasoned" when they're still too wet for optimal gasifier performance.

If you source air-dried logs, measure their moisture content before loading them into your gasifier. You'll need a moisture meter; cheap ones are unreliable, but a decent model costs £30–50. Target below 20% moisture for best results.

The advantage of air-dried logs is cost—they're typically 20–30% cheaper than kiln-dried. The disadvantage is inconsistency. If you're serious about gasifier efficiency, kiln-dried is worth the extra investment.

Wood Chips and Pellets

Some gasifier designs are compatible with wood chips or pellets. Softwood pellets made from forestry waste are cheap and widely available through online suppliers, heating oil merchants, and agricultural suppliers. They typically cost £200–300 per tonne in bulk.

Hardwood pellets are less common in the UK but more efficient. Expect to pay a premium for these.

If your gasifier is designed for chips, sourcing can be easier—some arborists and tree surgeons will sell or even deliver free untreated wood chips, though you'll need to dry them and screen out large pieces. This only works if you have the space and time to manage the material properly.

What to Avoid

Never burn treated, painted, or varnished wood. These release toxic fumes and damage your gasifier internals. The same applies to pressure-treated garden timber and railway sleepers.

Avoid softwoods entirely, or at least minimise them. Pine, spruce, and fir create excess tar that clogs systems and is expensive to clean out. If you have no alternative, use softwood sparingly mixed with hardwood, but don't rely on it.

Don't buy logs from casual sellers unless you can verify moisture content. "Seasoned" is a meaningless marketing term with no legal definition. A log stacked outdoors six months ago is not seasoned for gasifier use.

Avoid wood that's been stored in wet conditions, even if it's covered on top. If rain's blown sideways onto the stack, the outer logs will be damp for months.

Storage and Preparation

Once you've sourced quality fuel, storage matters. Stack logs in a dry location, covered on top to shed rain but open at the sides to allow air circulation. Never wrap tarps completely around the stack—this traps moisture underneath.

Before feeding wood into your gasifier, store it for at least two weeks in a warm, dry space if moisture content is marginal. A garage or shed with reasonable airflow will help final moisture evaporation.

Invest in a moisture meter. It's the only way to know if your fuel is genuinely ready. Check at least three logs per batch—moisture varies within stacks.

Finding Reliable Suppliers

Search for "kiln-dried hardwood logs UK" plus your postcode to find local suppliers. The Forestry Commission website lists approved timber merchants. Trade associations like the Wood Heat Association can recommend suppliers who work specifically with heating and gasifier customers.

Budget for delivery costs if you're ordering sacks. A pallet of kiln-dried logs is manageable for one person to unload and stack with a sack trolley.

Getting the fuel right means your gasifier will run cleaner, last longer, and deliver the efficiency you bought it for. It's the most important decision you'll make after installation.