Heating season fire safety checklist
Heating equipment is a leading cause of house fires between October and March. Use this checklist — space heaters, boilers, log burners, and alarms — before you switch on for the season.
Season checklist
Four areas to check before heating season begins
Space heaters
- Keep 1 m (3 ft) clear on all sides — no clothing, curtains or furniture within reach
- Never leave running unattended or overnight
- Plug directly into a wall socket — no extension leads or multi-adapters
- Choose a model with tip-over protection and auto shutoff
- Turn off and unplug before leaving the room
Central heating and boilers
- Book annual boiler service before October each year
- Bleed radiators if cold at the top — reduces pressure strain
- Check pressure gauge (should read 1–1.5 bar when cold)
- Test carbon monoxide alarm — replace if over 7 years old
- Ensure boiler flue is unobstructed and venting externally
Log burners and open fires
- Have chimney swept and inspected annually (HETAS / CSIA certified sweep)
- Burn only seasoned or kiln-dried wood (moisture <20%)
- Use a spark guard whenever the fire is unattended
- Keep the hearth rug non-combustible and clear of papers
- Never burn treated, painted or composite wood — toxic fumes and excess creosote
Alarms and detectors
- Test smoke alarm monthly — replace battery annually or when low-battery alert sounds
- Install a carbon monoxide alarm in every room with a fuel-burning appliance
- Replace CO alarms every 7–10 years (check manufacturer's date)
- Check alarm expiry dates — most smoke alarms last 10 years
- Fit a heat alarm in the kitchen if your smoke alarm triggers from cooking steam
Why heating fires peak in winter
According to the NFPA's home heating fire report, heating equipment causes around 48,000 home fires per year in the US alone, resulting in 500 deaths and $1 billion in property damage. Half of all home heating fires are caused by portable space heaters — specifically by placing combustibles too close to the heat source. The failure is almost always a clearance error, not an equipment malfunction.
For detailed rules on space heater use, including the three-foot rule, extension lead restrictions, and which models are safest, see our space heater safety guide.
Carbon monoxide: the invisible risk
Every fuel-burning heating appliance — gas boiler, log burner, paraffin heater, gas fire — can produce carbon monoxide (CO) if the flue is blocked, the appliance is faulty, or combustion is incomplete. CO has no colour or smell. Symptoms of CO poisoning — headache, nausea, dizziness — are easy to misread as seasonal illness. A properly installed, in-date CO alarm is the only reliable warning.
The UK government requires CO alarms in all rooms with fixed combustion appliances (including gas boilers) in rented properties. The US Consumer Product Safety Commission recommends CO alarms on every level of the home.
50%
Of home heating fires involve portable space heaters — almost always due to combustibles placed too close. Source: NFPA Heating Fires report.
Log burners and chimney fires
Chimney fires are caused by creosote — a tar-like residue that builds up on the flue liner when wood with high moisture content is burned. Creosote ignites at around 250°C (480°F) and burns at temperatures that can crack flue tiles and spread to the building structure. Burning only seasoned wood (moisture below 20%) and having the chimney swept annually are the two most effective preventive measures.
In the UK, HETAS-certified sweeps provide a certificate of sweeping, which may be required by building insurance. In the US, look for a CSIA-certified chimney sweep.
Sources: NFPA Home Heating · USFA Heating Fires · Electrical Safety First · HETAS · CSIA
Heating safety FAQ
Questions about heating season fire risks
Maintain at least 1 metre (3 feet) of clear space on all sides of a portable space heater — including above it. This clearance is specified by NFPA's heating safety guidance and the USFA. Clothing draped over a chair near a heater and curtains within reach are among the most common ignition scenarios.
No. Never leave a space heater running while you sleep or leave the room. Space heaters are designed for attended use only. Turn the heater off and unplug it before going to bed. If you need supplemental warmth overnight, use an electric blanket with an automatic overheat shutoff, or address the underlying draught or insulation issue. See our space heater safety guide for full rules.
No — this is dangerous and should never be done. A gas oven produces carbon monoxide (CO) when used for space heating, as it is not designed for sustained open-flame operation without proper combustion air flow. CO is odourless and can cause loss of consciousness and death without warning. Use a purpose-built heater with CO detection in the room. For full CO alarm guidance, see our carbon monoxide safety guide.
The HETAS (UK) and the Chimney Safety Institute of America (CSIA) recommend that chimneys used regularly be swept and inspected annually. If you burn unseasoned wood, sweep more frequently — wet wood produces more creosote, which builds up in the flue and is a fire hazard. The sweep should also check the liner, cowl, and seals around the register plate.
Turn it off immediately and unplug it if safe to do so. Do not use the heater again until it has been inspected by a qualified technician. A burning smell can indicate a wiring fault, accumulated dust burning off (normal on first seasonal use, brief and harmless), or a more serious internal fault. If the smell is strong, persistent, or accompanied by visible smoke, leave the room and call emergency services if needed.