Is Your Wood Heater Ready for Winter? A Pre-Season Checklist

It's the first properly cold evening of the year. You open the firebox, stack a few logs, and reach for the matches - then realise you haven't touched the wood heater since September. Is the flue clear? Are the door seals still good? Is that firewood even dry enough to burn?

A few simple checks now, while the weather is still mild, can save you from a smoky, frustrating start to winter - or worse, an unsafe one. Here's what to look at before you light your wood heater for the first time this season.

What should you check before lighting your wood heater this season?

You don't need tools or trade experience for these checks. They take about 20 minutes and can flag problems before they become expensive or dangerous.

• Look at the flue from outside. Check for bird nests, leaf debris, a loose or damaged cowl, or any visible rust or gaps. Birds love nesting in flues over summer - a blocked flue means smoke has nowhere to go.
• Open and close the flue damper. It should move freely without sticking. If it's jammed or stiff, don't force it - this needs professional attention.
• Test the door seal. Close the door on a piece of paper. If the paper slides out easily, the seal has lost compression and needs replacing. A worn seal lets air leak in, which means you lose control of the burn rate and waste heat.
• Inspect the firebricks. Small hairline cracks are normal and don't affect performance. But if you see large chunks missing or bricks crumbling away, they need replacing before you light the first fire. Firebricks protect the steel body of the heater from direct flame heat.
• Clean the firebox. Remove most of the old ash, but leave a thin bed of about two centimetres. A small layer of ash insulates the base and helps the fire burn more evenly.
• Clean the glass. Use a wood heater glass cleaner, not a standard household product. Regular glass cleaners can leave chemical residue that burns off at high temperatures and creates unpleasant odours - or damages the glass itself.
• Clear the hearth. Move anything flammable well away from the heater. Magazines, kindling bags, curtains, furniture - all of it needs a safe distance before the heater is in use.
• Check your firewood supply. Is it properly seasoned? Firewood needs a moisture content below 20% to burn cleanly and efficiently. If your wood hisses, smokes heavily, or feels heavy for its size, it's probably still too wet.

Pre-season checklist at a glance

What to check	What you're looking for	Action needed
Flue (from outside)	Bird nests, debris, loose or damaged cowl, rust	Clear debris yourself; book a professional for damage or nests inside the flue
Flue damper	Opens and closes freely without sticking	If jammed or stiff, book a professional service
Door seal	Paper slides out easily when closed in the door	Replace the seal - most last 3 to 5 years
Firebricks	Large cracks, crumbling, or missing chunks (hairline cracks are fine)	Replace damaged bricks before lighting
Firebox	Excess ash buildup from last season	Clean out, leaving a ~2 cm ash bed
Glass	Soot, residue, or cloudiness	Clean with wood heater glass cleaner only
Hearth area	Flammable items too close to the heater	Move everything to a safe distance
Firewood	Heavy, damp, or unseasoned wood (over 20% moisture)	Source dry seasoned hardwood - buy early

When should you book a professional flue clean and service?

The Australian Home Heating Association recommends servicing your wood heater at least once a year.

The most important part of a professional service is the flue clean - removing the creosote that builds up inside the flue over the burning season.

Creosote is a tar-like residue left behind when wood smoke cools and condenses inside the flue. It restricts airflow, reduces your heater's performance, and in serious cases it can ignite, causing a flue fire. Even if your heater seemed fine last winter, creosote can still be building up - especially if you burned unseasoned wood or ran the heater on low for extended periods.

A qualified chimney sweep will clean the flue, check its structural integrity, inspect clearances to combustible materials, and make sure the cowl is secure. In some states, flue work must be carried out by a licensed mechanical services plumber, so check the requirements in your area before booking.

The least busy time to schedule a service is late summer or early autumn - February to April in most of southern Australia. Wait until May and you'll be competing with every other household that forgot to book early. In colder areas like Ballarat, the Gippsland ranges, and Tasmania, getting in early matters even more.

What firewood should you have ready?

The single biggest factor in how well your wood heater performs is the quality of the firewood you put in it. Seasoned hardwood - dried to below 20% moisture content - burns hotter, produces less smoke, and leaves less creosote in the flue.

Wet or green wood is the opposite on every count. It smokes heavily, delivers poor heat, and coats the inside of the flue with the kind of buildup that leads to problems. If you've ever wondered why your heater doesn't seem to throw as much heat as it should, the firewood is the first thing to look at.

A few practical tips for getting your firewood supply right:

• Buy early. Good firewood suppliers start running low as winter approaches. Ordering in late summer or early autumn gives you the best selection and time to let the wood dry further if needed.
• Store it properly. Off the ground, under cover, and with airflow around the stack. A tarp over the top is fine, but don't wrap the sides - the wood needs air circulation to stay dry.
• Split before stacking. Split wood dries significantly faster than whole rounds. If you're splitting your own, do it well before you need to burn it.
• Never burn treated timber, painted wood, or household rubbish. These release toxic chemicals, damage your heater, and can void your warranty.

For a deeper look at which species burn best and why, have a read of our guide to the best types of wood to burn in your wood heater.

How can you make your wood heater work better this winter?

Your wood heater can only do so much if the rest of your home is leaking heat. A few simple improvements make a noticeable difference:

• Draught-proof doors and windows. Foam tape or rubber seals around draughty gaps are cheap and easy to fit. Close curtains or blinds at night to reduce heat loss through the glass.
• Use the air control properly. When lighting the fire or adding new logs, open the air control fully and leave it there for 15 to 20 minutes. This lets the fire establish properly and burns off volatile gases before you turn it down. Closing the air too early causes smoke, poor combustion, and faster creosote buildup.
• Don't overfill the firebox. Follow the manufacturer's guidelines for log size and quantity. Cramming in too much wood smothers the fire and forces you to run on low burn for too long.
• Step outside and check the flue. If you can see smoke coming from the top, the fire isn't burning efficiently. Adjust the air control and make sure you're using dry wood.

Frequently asked questions about prepping your wood heater for winter

How often should a wood heater be serviced?
The Australian Home Heating Association recommends at least once a year. If you burn frequently through winter - most nights from May to September - an annual service is the minimum. Households in colder regions that burn daily may benefit from a mid-season flue check as well.

How do I know if my door seal needs replacing?
The paper test is the simplest check. Close the door on a piece of paper and try to pull it out. If it slides out with little resistance, the seal isn't gripping properly and needs replacing. Most seals last three to five years depending on use.

Can I burn softwood in my wood heater?
You can, but it burns faster and produces less heat per kilogram than hardwood. Softwood like pine is fine for kindling and getting the fire started, but hardwood is a better choice for sustained heating. Avoid burning softwood exclusively, as it produces more creosote than hardwood.

How do I know if my firewood is dry enough?
Seasoned firewood should have a moisture content below 20%. Practical signs: it feels lighter than you'd expect, the ends show visible cracks or splits, and it makes a hollow sound when two pieces are knocked together. If you want to be certain, a moisture meter costs around $20 to $40 from most hardware stores.

What should I do if smoke comes back into the room?
First, check that the flue damper is fully open. If it is, the flue may be cold - try warming it by burning a small amount of kindling with the air control wide open before loading full-sized logs. Persistent smoke blowback can indicate a blockage in the flue, poor draw caused by the home being too airtight, or wind downdraught. If it happens regularly, book a professional inspection.

Time to check, or time to upgrade?
If your wood heater passes every check on this list, you're set for a warm winter. If it doesn't - or if your heater is older, inefficient, or no longer meets current Australian standards - it might be time to look at what's changed since you last bought one.

Modern Australian-made wood heaters burn cleaner, heat more efficiently, and come with the kind of build quality that lasts. Ultimate Fires' range is factory-direct with a 10-year warranty, and you can see every model in person at showrooms in Melbourne, Geelong, Ballarat, Adelaide, Perth, Sydney, and Newcastle.

If your heater needs professional servicing, your local Ultimate Fires dealer can point you toward a qualified service technician in your area.