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Maintaining a log burner safely and efficiently

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  • 24th March 2019
Maintaining a log burner safely and efficiently

Why a well-tended stove rewards you

A wood burner is one of the most satisfying ways to heat a room, but it is not a plug-and-forget appliance. Treated well, a modern stove will run at around 70 to 80 per cent efficiency, throwing genuine warmth into the room rather than sending it up the chimney. Neglected, the same stove will guzzle logs, blacken its glass, coat the flue in tar and put your household at genuine risk.

The good news is that the routine required is simple. Ten minutes of attention a week, a proper clean at the end of the season and an annual chimney sweep will keep a stove performing beautifully for decades. What follows is the practical knowledge every rural householder ought to have.

Fuel matters more than anything else

Burning wet wood is the single most common mistake. Unseasoned logs waste most of their energy boiling off moisture, and the steam that results carries tar and creosote into your flue. That deposit is what causes chimney fires.

  • Seasoned hardwood such as ash, oak, beech, hawthorn or sycamore is ideal. Ash is superb because it can be burned almost straight after felling, though most species need time.
  • Moisture content below 20 per cent is the benchmark. A cheap moisture meter, plunged into a freshly split log, takes seconds to give you a reading.
  • Air-dry for at least a year, ideally two, under a covered but open-sided log store with the wind blowing through. Stacked bark-down and off the ground in a single row dries best.
  • Never burn treated timber, painted offcuts, pallet wood that may be chemically treated, or household rubbish. These release corrosive compounds and can damage the stove and flue liner.
  • Kiln-dried logs are a fine standby when your own supply is not ready, and they are reliably below 20 per cent.

Buy in spring if you can, when prices are lowest, and let your own stack continue to season through the summer.

Controlling the burn with the air vents

A stove needs three things to burn cleanly: fuel, heat and oxygen. The air controls govern the last of these, and understanding them transforms your fuel economy.

The primary air vent, usually at the bottom, feeds oxygen to the base of the fire. It gets a cold stove going and is closed down once the logs are properly alight. The secondary air vent, often a slider above the door, supplies air to the top of the firebox and drives the airwash that keeps the glass clear. On clean-burning stoves this should stay open to some degree throughout the burn.

There is also usually a tertiary air supply, fixed and non-adjustable, which burns off the volatile gases above the fuel bed. This is what makes a modern stove so much cleaner than an open fire.

The great error is damping a stove right down to make the logs last. Smouldering produces far more smoke, far more creosote and far less heat. Aim instead for a bright, lively fire with visible flame, then reduce the primary air gradually. You should see the fire settle rather than die.

Chimney checks and the annual sweep

Whatever fuel you burn, you need the flue swept at least once a year, and twice if you burn wood regularly or burn unseasoned logs at all. Use a registered sweep who will issue a certificate, which your insurer may ask to see.

Between sweeps, keep an eye on the following:

  • Smoke from the chimney that is visible after twenty minutes of burning means incomplete combustion — check your wood and your air settings.
  • A smell of soot or tar in the room, or a draught that reverses, suggests a blocked or failing flue.
  • Blackened glass usually points to wet wood or too little secondary air.
  • Staining or cracked render around the flue exit can indicate water ingress or a failing liner.
  • Carbon monoxide alarms should be fitted in the same room as any solid fuel appliance. This is not optional; it is basic safety.

Birds' nests, cobwebs and fallen mortar can all obstruct a flue over the summer. A quick check before your first autumn fire saves trouble later.

Clearances, the hearth and the room

Heat radiating from a stove is intense, and Building Regulations set minimum distances for good reason. As a rule of thumb, allow at least 150 mm from the sides and rear of the stove to any combustible surface, though always check the manufacturer's own figures, which take precedence.

The hearth beneath must be non-combustible and thick enough to protect the floor. For a stove with a hearth temperature not exceeding 100°C, that generally means 12 mm of non-combustible material; older or larger appliances may need more. Extend the hearth at least 225 mm in front of the stove for a typical household installation.

Keep firewood, kindling, newspapers, baskets and soft furnishings well away from the stove — at least a metre is a sensible habit. Never use a stove as a drying rack or a bin for cardboard.

A simple routine that keeps everything right

Each time you light up, use a firelighter or a small top-down fire rather than liquid accelerants. Let the stove reach temperature before settling it down. Rake the ash gently, leaving a thin bed to insulate the grate, and empty the pan only when it is cool.

Weekly, clean the glass with a damp cloth and a little ash, and check door seals by closing the door on a strip of paper — if it slides out easily, the rope gasket needs replacing. Yearly, have the flue swept, inspect the firebricks and baffle plate for cracks, and touch up any rust on the bodywork with stove paint.

Do those things faithfully and your wood burner will reward you with steady heat, low fuel bills and the quiet pleasure of a proper fire on a cold British evening.

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19th May 2018 Reply

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