Gas combustion and indoor air
Burning natural gas or liquefied petroleum gas, known as LPG, can produce pollutants including nitrogen dioxide and carbon monoxide. Research has also identified other emissions associated with gas cooking and gas supply systems.
The type and concentration of pollutants depend on the appliance, its condition, the fuel, ventilation, cooking method, duration of use and the size of the room. The presence of a gas appliance does not establish the level of exposure within an individual home.
Nitrogen dioxide can irritate the respiratory system. Carbon monoxide can be dangerous where combustion is incomplete or ventilation is inadequate. Any concern about the condition or safety of a gas appliance should be referred to a licensed gasfitter or the relevant gas supplier.
An externally ducted rangehood may help reduce pollutants produced during cooking when it is appropriately designed and used. A recirculating rangehood does not discharge cooking air outside. Opening windows may support ventilation, but it is not a substitute for having gas appliances installed, maintained and operated correctly.
When inspecting a property with gas cooking, confirm whether the rangehood vents outside or recirculates air into the room.
Health considerationsWhat the health evidence means for buyers
Research has linked gas cooking with increased indoor pollutant concentrations and has examined possible associations with respiratory health, particularly childhood asthma. The strength and size of these associations vary between studies, and population estimates should not be treated as a diagnosis or prediction for an individual household.
People with asthma or other respiratory concerns may wish to consider the appliance condition, kitchen ventilation and available electric alternatives more closely. Buyers seeking health advice should rely on current guidance from qualified health professionals and recognised health authorities.
Induction and conventional electric cooktops do not produce combustion pollutants during operation because they do not burn fuel in the kitchen. Cooking itself can still produce particles and moisture, so appropriate ventilation remains useful with any cooking appliance.
Gas appliances should be installed, serviced and repaired by appropriately licensed professionals. If there are signs of incomplete combustion, unusual odours, soot, damaged equipment or concern about carbon monoxide, stop using the appliance and obtain professional advice.
Queensland has statutory requirements for smoke alarms in residential property, but there is no general requirement for every home with gas appliances to have a carbon monoxide alarm. Buyers considering a carbon monoxide alarm should seek current safety guidance and select equipment suitable for the intended use.
Understanding the ongoing costs
A property connected to a natural gas network may have a supply charge as well as consumption charges. The applicable tariffs and fees depend on the retailer, plan and location.
LPG has a different cost structure and may involve cylinder or tank rental, delivery charges, minimum orders and supplier arrangements.
When comparing gas and electric appliances, consider:
- The appliances installed
- Household use
- Current energy tariffs
- Appliance efficiency and condition
- Available solar generation
- Maintenance requirements
- Likely replacement timing
- Any electrical, plumbing or gas work required
The lower cost option will depend on the property, household use, tariffs and equipment being compared. Use current tariffs, property specific information and quotes from appropriately licensed trades where the financial difference is important.
Planning for electrificationPlanning future appliance replacement
Electrification does not need to happen all at once. Buyers can consider replacing gas appliances as they reach the end of their useful life, during renovation work or when an electric alternative better suits the household.
The appropriate sequence depends on:
- Which appliances use the most gas
- Their age and condition
- Household priorities
- Available electrical capacity
- Space and installation requirements
- Existing solar or battery systems
- Planned renovation work
- Current incentives and available budget
Hot water
If the property has gas hot water, confirm the system type, approximate age, capacity, condition and available service history. When replacement is required, compare suitable gas, electric resistance, heat pump and solar options for the property. The Hot Water System Types guide covers each option in more detail.
Cooking
If the property has gas cooking, check the appliance condition and ventilation. Induction or conventional electric cooking may be considered when the appliance is replaced or the kitchen is renovated.
Changing to induction may require compatible cookware, appropriate wiring and sufficient electrical capacity. Installation requirements and costs vary by property and appliance.
Space heating
Where gas space heating is installed, confirm the system type, age, condition and areas served. Reverse cycle air conditioning may be one electric alternative, but sizing, installation and suitability should be assessed for the individual home.
Electrical capacity
Additional electric appliances may require changes to the switchboard, wiring or available electrical supply. A licensed electrician can assess the property's capacity and explain what work, if any, would be required.
Gas disconnection
Once gas appliances are no longer required, the owner can ask the retailer about temporary disconnection or permanent abolishment of the gas service.
Only appropriately qualified professionals should complete gas disconnection work. Processes and charges vary by retailer, distributor, property and location, so confirm the current requirements directly with the relevant provider.
Solar and batteriesHow solar and batteries may affect the decision
Solar generation may help offset some electricity used by appliances during daylight hours. How much depends on the system size, orientation, shade, weather, household demand and when the appliances operate.
A battery may store some solar energy for later use, but its practical and financial value depends on the equipment, available capacity, household use, tariffs and system configuration.
Solar and battery equipment should be assessed by confirming:
- System size
- Approximate installation date
- Ownership
- Panel and inverter details
- Battery capacity where installed
- Available warranties
- Installation and compliance records
- Monitoring or generation information where available
- Known faults or maintenance issues
Electricity bills and grid reliance cannot be assumed from the presence of solar or battery equipment alone.
What to check when buyingQuestions for a property with gas
Appliances
Which appliances use natural gas or LPG, and which are already electric?
Condition
What is the approximate age, condition and available service history of each gas appliance?
Kitchen ventilation
Does the rangehood discharge outside or recirculate air into the room?
Gas supply
Is the property connected to a natural gas network or supplied by LPG?
LPG arrangements
If LPG is used, are the cylinders or tank owned or rented, and what delivery or supply arrangements apply?
Electrical capacity
Has a licensed electrician assessed whether the switchboard and wiring can support any proposed electric appliances?
Solar and battery equipment
What equipment is installed, and what documentation or performance information is available?
Disconnection
What process and charges would apply if the gas service were no longer required?
Professional advice
Are any gas, electrical or ventilation concerns worth investigating with an appropriately licensed professional before purchase?
A property with gas appliances can still be a suitable purchase. What matters is understanding what is installed, its condition, how it is ventilated and what future replacement may involve.
I would look at the appliances, available documentation, electrical capacity and any planned renovation work together. That gives the buyer a practical basis for deciding whether to leave the existing systems in place, replace them over time or investigate an earlier transition.
The current Queensland position
Queensland currently permits residential gas connections and does not generally require existing homes to remove gas appliances.
Requirements, incentives and energy policies can change. Buyers making decisions based on future construction or appliance rules should confirm the current position using official Queensland and Australian Government sources.
For an existing property, the immediate questions are usually practical rather than political: what appliances are installed, what condition they are in, what supply arrangements apply and what alternatives may suit the household when replacement is required.
LPG propertiesLiquefied petroleum gas considerations
Some properties use liquefied petroleum gas, known as LPG, where a natural gas network connection is not available or has not been installed.
When assessing an LPG property, check:
- Which appliances use LPG
- The condition and service history of those appliances
- Cylinder or tank location and apparent condition
- Whether the equipment is owned or rented
- Supplier and contract arrangements
- Delivery access
- Current pricing and minimum order requirements
- Any available compliance documentation
Indoor air quality and ventilation considerations still apply because LPG is a combustible fuel. The specific emissions and exposure within a home depend on the appliance, fuel, operation, maintenance and ventilation.
The case for changing from LPG to electric appliances depends on the property's energy use, appliance condition, electrical capacity, available solar and the cost of replacement. The financial outcome depends on the property, household use, tariffs, equipment and installation costs.