WA's energy safety regulator has issued it's annual winter safety warning about gas heaters and why consumers should contact licensed gas fitters.

Consumer need to understand that faulty gas heaters and poor ventilation create the risk of carbon monoxide poisoning, which is potentially lethal.

Carbon monoxide is an invisible, odourless and tasteless gas that can kill. The signs of carbon monoxide poisoning range from flu-like symptoms (such as headaches, fatigue and nausea) through to heart irregularities, vomiting, seizures and collapse.

Building and Energy wants consumers to know gas heaters should be serviced by a licensed gas fitter at least every two years, or annually if the equipment is more than 10 years old.

WA's Director of Energy Safety, Peter Stewart, says a properly qualified gas fitter can inspect heaters for issues such as blockages from lint and dust, overheating or burner problems. They can also check whether a room has adequate ventilation.

Consumers should contact a licensed gas fitter if it's been more than two years since their gas heater was serviced, or if there are signs such as discolouration or difficulty relighting that indicate a fault.

A room with a bayonet point for a gas heater should have unobstructed ventilation close to floor and close to ceiling. Exhaust fans can pull carbon monoxide into living spaces and should never be used at the same time as open-flued gas heaters.

Outdoor and portable gas appliances, such as patio heaters and camping equipment, should never be used indoors and should also be regularly serviced.

See Building and Energy's winter gas safety media release.