Adelaide Winter Gas Heater Checklist (Pre-Winter 2026)

Published 26 April 2026 · Written by Sidney — Licensed Gas Fitter, Pilot Gas Adelaide · 9 min read

TL;DR: Start prepping your gas heater in April — not July. A 30-minute DIY check in autumn, plus a licensed service every 1–2 years, means a reliable heater that runs efficiently through Adelaide's coldest weeks. Skip it and you'll be one of the hundreds ringing fitters mid-winter with no heat.

Adelaide winter — what your heater's actually up against

Adelaide's winter isn't Melbourne's or Canberra's, but don't let that fool you. We regularly hit overnight minimums of 3–6°C in the hills suburbs and 5–8°C on the plains, with June and July averaging well under 16°C during the day. Add the damp cold that rolls in off the gulf and you've got a heater running long hours, every day, for three solid months.

Most Adelaide homes are also on the older side — stone cottages in the inner suburbs, 60s and 70s brick veneer in Tea Tree Gully, newer estates in Mawson Lakes, beachside builds in Henley. The heating load varies, but the common theme is: if your heater isn't ready before June, you'll feel it.

This checklist is the one I give to friends and family in the last week of March.

April checklist (do it now)

1. Test-run the heater before you need it

Fire it up on a cool morning. Let it run 15 minutes. Listen for:

• Banging or booming on ignition (bad — delayed ignition)
• Screeching or grinding from the fan (bearing failure imminent)
• Clicking without firing (ignition electrode or gas valve)
• Burning dust smell (normal for first 10 minutes only)

Watch the flame through the burner window. Blue = healthy. Yellow/orange = book a fitter. See 10 Signs Your Gas Heater Needs Repair.

2. Vacuum the return air grille and replace/clean filters

On ducted units, the big return air grille (usually on a wall or in the ceiling) pulls in all the dust from six months of summer. Vacuum it. If there's a filter behind it, wash or replace it.

On wall furnaces and space heaters, vacuum the front grille and the back/top of the unit where dust settles.

3. Clear a 1-metre safety zone

Nothing within a metre of the heater. No curtains, no washing baskets, no boxes, no shoes, no cat beds. Adelaide's winter sunlight has people piling laundry onto warm heaters — that's how fires start.

4. Inspect the flue from outside

Go outside and look up at the flue cowl. Clear any:

• Bird nests (common, especially in older brick homes)
• Leaf buildup (eucalyptus leaves are a menace)
• Cobwebs and huntsman nests
• Rust damage on the cowl itself

If the flue looks rusted through, wobbly, or partially disconnected — ring a fitter before using the heater.

5. Test your CO alarm

Press the test button. If it chirps weakly or doesn't sound, replace the battery or the whole unit. If you don't have one, buy one (under $100). See our CO safety guide.

6. Check the thermostat and controller

Run the heater through a full cycle — cold start, thermostat hit, cut-out, restart. Make sure every setting works. Replace thermostat batteries now, not in July.

7. Book your service (if due)

If it's been two winters since the last service (or one winter for older units), book now. Fitters have capacity in April. By late May, the diary fills up. See our service frequency guide.

May checklist

1. Bleed any unused circuits

If you have a ducted system with zones, run every zone for 10 minutes. Zones that haven't been used since last winter can have stuck dampers.

2. Seal draughts around the house

A heater can't beat a leaky house. Before winter, check:

• Door seals — replace torn weather stripping
• Window seals — silicone gaps along frames
• Exhaust fans in bathrooms and kitchens — close the flap
• Fireplaces not in use — close the damper and consider a chimney balloon
• Skirting gaps in older stone cottages — caulk or cover with rubber strip

Every degree your home loses costs you on the gas bill.

3. Confirm gas supply

If you're on bottled LPG, check the levels and schedule your first winter refill. If on natural gas, ensure your bill is paid and you haven't accidentally switched to a summer-only plan.

4. Stock up on spare filters

For ducted units, having one or two spare return air filters on hand saves a mid-winter hunt.

5. Plan for power outages

Modern gas heaters need electricity to run the fan and electronics. Know where your torches are, and if you're in a storm-prone area (hills suburbs, coastal), consider a small UPS or battery backup.

June to August: in-season maintenance

Weekly

• Quick visual on the flame — still blue?
• Ears open for new noises
• Check airflow — still strong?

Monthly

• Vacuum the return air grille (Adelaide dust doesn't sleep)
• Check filter — wash or replace if clogged
• Test CO alarm
• Inspect the area around the heater — still clear?

On a bad weather day

If there's been a storm, check the flue outside. Loose cowls, fallen branches on the flue, bird nests dislodged mid-gale — all common and all worth fixing before the next cold snap.

End-of-season shutdown (September)

When you finally turn the heater off for summer:

• Run it one last time for 20 minutes to burn off residual moisture inside the heat exchanger
• Turn off at the thermostat and the isolation valve
• Cover outdoor or alfresco heaters (not the flue cowl — that stays clear)
• Book next winter's service now, while you're thinking about it

Whole-home efficiency tips

Your heater is only half the equation. These make the biggest difference in Adelaide homes:

• Zoning. Only heat rooms you use. A closed bedroom door is free heating control.
• Thermostat at 18–20°C. Every degree higher adds ~10% to your gas bill.
• Ceiling fans in reverse. On a low setting, they push warm air down from the ceiling. Works best on ducted returns.
• Heavy curtains. Close them at dusk. Adelaide's single-glazed windows leak heat like mad.
• Rugs on tile and polished concrete floors. Cold floors make the room feel 2–3°C cooler than the thermostat reads.
• Ceiling insulation. If your home's pre-2005 and you've never topped up the roof batts, do it. Biggest single return on spend.

When to ring a fitter

Anything below means ring before using the heater again:

• Yellow or orange flame
• Soot marks on or near the unit
• Gas smell (rotten eggs) — turn off first, ring 1800 427 532 for emergency gas, then us
• Banging on startup
• CO alarm sounding
• Symptoms of CO exposure (headache, nausea, drowsiness)
• Visible damage to the heater or flue
• Heater not lighting after three attempts

For the full "things are going wrong" playbook, see our gas heater emergency guide.

Most common mid-winter issues we see

After a decade of emergency calls through June–August, these are the top reasons we get rung urgently. All preventable with the checklist above.

Heater won't ignite on first cold morning

The number-one emergency call. Usually a dirty pilot or weak ignition electrode that's been limping along and finally gives up when cold-start pressure drops. Fix with a service. Waiting until July means a 4–7 day queue.

Burning dust smell that won't go away

First 10 minutes on season start: normal. After that: the heat exchanger or burner is caked with dust from a year of disuse. Will keep smelling (and costing gas) until serviced.

Thermostat shows temperature but house is cold

Thermostat battery dying, thermostat location near a draught, or controller miscommunication. Check batteries first. If persists, service or controller replacement.

Big rooms cold, small rooms hot

Ducted zoning issue. Dampers stuck from summer, duct leaks, or incorrect sizing from the original install. A good service balances airflow.

Gas bill doubled

Heater running longer and harder due to fouled burner or failing fan. Service recovers most of the lost efficiency.

Random shutdowns

Flame sensor coated in carbon (5-minute clean), overheat sensor tripping from blocked airflow, or control board intermittent fault. Service to diagnose.