Whether you are firing up the barbecue on a weekend, heating your home through winter, or running a gas cooktop, there is a good chance you are already using LPG. It is one of the most common household energy sources going — but few people understand much beyond “the bottle connects to the barbecue.”
Here is a practical guide to how LPG works, where it fits in your home, and what you need to know to use it properly.
What Is LPG, Exactly?
LPG stands for liquefied petroleum gas. It is a hydrocarbon gas — primarily propane, butane, or a mix of both — that is compressed into liquid form for storage and transport. It is produced as a byproduct of natural gas processing and petroleum refining.
If you have ever wondered what is LPG at a chemical level, the short version is this: when compressed, it reduces to about 1/250th of its gaseous volume. That energy density is what makes it so practical. A relatively small cylinder holds enough fuel to run a barbecue for weeks or heat a home through winter.
Propane and butane behave slightly differently. Propane works better in cold climates because it vaporises at lower temperatures, while butane is more efficient in warmer conditions and is commonly found in smaller portable canisters. Most household LPG sold in cooler regions is predominantly propane.
LPG vs Natural Gas: What Is the Difference?
This is one of the most common points of confusion. Natural gas (methane) is delivered through mains pipelines, while LPG is stored in bottles or tanks and delivered to your property.
If your home is not connected to the natural gas grid — which is common in regional and semi-rural areas — LPG is likely your primary gas option. It burns hotter than natural gas, so appliances need to be configured for the correct gas type. Using the wrong setting can affect both performance and safety.
Key differences:
- Energy output: LPG contains roughly twice the energy per cubic metre compared to natural gas
- Delivery: Bottles or bulk tank vs mains pipeline
- Portability: LPG can go anywhere — camping, caravanning, outdoor entertaining
- Pressure: LPG operates at higher pressure, which is why regulators are essential
- Conversion: Most gas appliances can be converted between LPG and natural gas by a licensed gasfitter, though the jets and regulators need to be swapped
For homeowners moving to a property without mains gas, LPG is typically the most practical alternative. The infrastructure is minimal — a bottle or tank, a regulator, and compliant piping — and installation is straightforward.
Common Uses Around the Home
LPG is more versatile than most people realise. Beyond the obvious barbecue bottle, here is where it is commonly used:
Heating
Gas ducted heating and portable gas heaters run efficiently on LPG, making it a reliable option for homes without mains gas. Modern units are far more energy-efficient than older models, and many now come with programmable thermostats and zoning capabilities that let you heat only the rooms you are using.
Hot water
Gas hot water systems — whether storage or instantaneous — are among the most cost-effective ways to heat water, particularly for larger households. Instantaneous systems are worth a look because they only heat water on demand, cutting out the standby losses you get with a tank that sits there keeping water hot all day whether you need it or not.
Cooking
Gas cooktops give you instant heat control that electric and induction cannot quite match — high flame to a low simmer in a second. LPG delivers the same performance as piped natural gas, with the added benefit of working during power outages. There is a reason professional kitchens run almost exclusively on gas.
Outdoor entertaining
From patio heaters to pizza ovens and fire pits, LPG powers the outdoor living setups that have become a staple of modern backyards. Outdoor kitchens with gas-plumbed barbecues, wok burners, and rotisseries are increasingly common in new builds and renovations. A dedicated gas line to your outdoor area eliminates the hassle of swapping bottles mid-event.
Generators
Portable and standby generators can run on LPG, providing backup power during outages. LPG generators tend to run cleaner and quieter than petrol equivalents, and the fuel stores indefinitely without degrading — unlike petrol, which can go stale within a few months.
LPG for Caravanning and Camping
For anyone who spends time on the road, LPG is the backbone of off-grid comfort. Caravan and camper setups typically rely on LPG for cooking, heating, and running absorption fridges. A standard dual-bottle setup with an automatic changeover valve means you never run out unexpectedly — when one bottle empties, the system switches to the second, giving you time to organise a refill.
Gas-powered camping stoves and lanterns are lighter and more reliable than their electric alternatives, and refilling or exchanging bottles is simple at most service stations and hardware stores. For extended trips, knowing your daily consumption rate helps you plan refills and avoid being caught short in remote areas.
Safety Basics Every Homeowner Should Follow
LPG is safe when handled correctly, but there are a few non-negotiable rules:
- Store cylinders upright and outdoors — never in enclosed spaces like garages or sheds. LPG is heavier than air, so any leak in an enclosed space creates a pool of flammable gas at ground level
- Check connections regularly — a simple soapy water test on joints will reveal any leaks through bubbling. Do this every time you reconnect a bottle
- Keep cylinders away from heat sources — direct sunlight for extended periods or proximity to open flames can increase pressure inside the cylinder
- Know the smell — LPG is naturally odourless, but a strong odorant is added so leaks can be detected. It smells like rotten eggs. If you notice it, turn off the supply, avoid any ignition sources, ventilate the area, and move away before calling for help
- Use a licensed gasfitter for any installation or appliance connection — this is not optional, it is a legal requirement in most jurisdictions
- Never modify valves or regulators — these are precision safety components. If a regulator is damaged or a valve is sticking, replace it rather than attempting a repair
- Transport cylinders upright and secured — when picking up a refill, keep the bottle upright in a ventilated area of your vehicle, never in the boot with the lid closed
How to Choose the Right Bottle Size
LPG bottles come in a range of sizes, and picking the right one depends on your usage:
- 4kg: Portable camping stoves, small appliances, and single-burner setups
- 9kg: Standard barbecue size — the one most homeowners are familiar with. Typically lasts 10 to 15 barbecue sessions
- 15kg: A good middle ground for caravans and larger outdoor setups
- 45kg: Home heating, hot water systems, and cooktops. Usually installed in pairs with an automatic changeover
- Bulk tanks: For properties using LPG as their primary energy source. Capacities range from 500 litres to several thousand litres, with scheduled delivery refills
If you are running multiple appliances off LPG, a bulk tank with scheduled refills is usually more convenient and cost-effective than swapping individual bottles. Most suppliers offer automatic top-up services based on your estimated usage, so you rarely need to think about it.
What It Costs to Run
LPG pricing depends on where you live, your supplier, and whether you are buying individual bottles or bulk. As a rough guide, a standard 9kg barbecue bottle runs between $25 and $40 to exchange, while bulk delivery is typically cheaper per litre because you are cutting out the handling and swap logistics.
For homes running LPG as a primary energy source, it is worth comparing suppliers annually. Pricing can vary significantly, and some providers offer better rates when you bundle services like tank rental and scheduled refills. Locking in a contract can also protect you from seasonal price fluctuations.
In terms of running costs, LPG heating and hot water are generally competitive with electricity — and in areas with higher electricity tariffs, gas often comes out ahead. Modern gas appliances are significantly more efficient than older models, so upgrading dated equipment can make a noticeable difference to your bills.
A Reliable Energy Source Worth Understanding
LPG is one of those things most homeowners take for granted until the bottle runs out mid-cook. Taking a few minutes to understand how it works, how to use it safely, and which setup suits your home means fewer interruptions and better value from one of the most dependable energy sources available.
Whether you are setting up a new property, upgrading your outdoor kitchen, or just trying to figure out why your barbecue is not lighting properly, a basic understanding of LPG goes a long way. It is a mature, well-understood fuel with a straightforward supply chain — and once your setup is right, it largely takes care of itself.
