Gas pool and spa heater safety
Gas water heaters designed for external use can be fatal if they are installed incorrectly. Learn about what property managers, builders and gasfitters must do to ensure safety standards are met.
Gas fired water heaters need ventilation to operate safely
Gas water heaters designed for external use can be fatal if they are installed in enclosed spaces without proper ventilation.
Gas needs fresh air to burn cleanly and to get rid of dangerous exhaust fumes and surplus heat.
Without sufficient ventilation, gas heaters can produce dangerous amounts of carbon monoxide.
What property managers must do
If you manage a property with a gas pool or spa heater, you need to be aware of the safety risks and take steps to ensure that the heating appliance is operating safely.
Make sure you comply with the safety checklist below and that the gas heaters are serviced once a year by a licensed gasfitter.
If you have concerns about the safety of a water heater on your property, you should close down the gas heater immediately and contact a licensed gasfitter to arrange an inspection.
What builders and gasfitters must do
You must be aware of the safety requirements for the installation of gas heaters for external use.
These are easily identified as they are not fitted with a flue.
Unflued water heaters must always be located outside and remain outside following any building extensions.
Never enclose gas pool and spa heaters designed for outdoor use.
If you modify, extend or enclose a building, garage, balcony or basement, always check for gas fired appliances.
Inspect the roofline for the emergence of a flue or chimney which could indicate the position of a flued gas water heater below.
Although provided with a flue, these appliances need air. Never enclose gas pool or spa heaters designed for external use.
Safety checklist
Danger signals
Carbon monoxide on its own is odourless. However, in the majority of cases when carbon monoxide is formed, other partially oxidised gases are also produced.
These other gases produce an acrid or pungent smell.
Some people have likened the odour to the smell of the fumes emitted by a forklift truck or taxi.
If you notice an acrid or pungent smell around a gas appliance, there is a good chance that it is also producing high levels of carbon monoxide.
If you have concerns about the safety of a water heater, you should close it down immediately and contact a licensed gas fitter to arrange an inspection.
More information
- Property managers should contact a licensed gasfitter for enquiries about their gas pool and spa heaters.
- Builders and gasfitters should refer to AS/NZ 5601 for more information.
- Find out more about using a gasfitter.