My gas heater flame looks different. Is that a problem?

On most gas space heaters and ducted heaters the burner flame is mostly blue. Warning signs include a flame that turns yellow or orange, lifts off the burner, flickers or floats lazily, or is much smaller or larger than usual. Soot or dark marks around the heater or vents, a new smell, popping or a bang at start-up are changes too. Decorative log and flame-effect fires are designed to burn yellow, so with those, compare against how the flame normally looks.

A changed flame usually means the gas isn't burning cleanly, perhaps because of a blocked burner, a damaged flue or not enough air. Energy Safe Victoria warns that all gas heaters can spill carbon monoxide, which you can't see or smell. Victoria's Department of Health lists tiredness, shortness of breath, headaches, dizziness, nausea, weakness, confusion and chest pain among the possible symptoms.

If anyone feels unwell while the heater is running, turn it off, get everyone into fresh air and seek medical help. A carbon monoxide alarm helps, but Energy Safe Victoria says it should never replace regular servicing.

Gas heater servicing and repair belongs with a licensed Type A gasfitter. Energy Safe Victoria also suggests considering replacement if a heater is old or hasn't been serviced for several years. If you rent, report the change to your rental provider or agent in writing.

If you're weighing a replacement, a reverse-cycle system is one option. Owner-occupiers aren't required to switch gas space heating to electric, but reverse-cycle also cools in summer. Our team handles the electrical side of reverse-cycle installs, and hardwired carbon monoxide alarms, which must be installed by a licensed electrician.