How Long Does a45kg Gas Bottle Last?
If you’re wondering how long a 45kg gas bottle lasts, many of us ask the same question. It’s one of the most common questions Australian households ask when using LPG, especially when trying to budget for refills, compare suppliers, or decide whether switching providers makes sense.
The short answer is: it depends on how LPG is used in your home. Some households go through bottles quickly, while others may only need a refill a few times a year.
On this page, we explain:
- how long a 45kg LPG gas bottle typically lasts
- how usage differs by appliance
- what affects refill frequency
- how usage impacts your overall LPG costs
- how to check pricing and supply options for your address
Contact us for pricing
What Affects How Long a 45kg Gas Bottle Lasts?
Several factors influence LPG usage and refill frequency.
Appliances Connected to LPG
The more appliances using gas, the faster bottles empty.
Common LPG appliances include:
gas hot water systems
cooktops and ovens
gas heaters or fireplaces
outdoor kitchens and BBQs
Homes using LPG for hot water typically have the highest usage. However, LPG gas is an economical way to heat water, especially when electricity pricing is raising rapidly. I’m paying over 30c per kilowatt.
Household Size
Larger households usually use more gas, particularly for showers and hot water.
For example:
- a couple may use significantly less gas than a family of five
- multiple daily showers increase consumption quickly
Season and Climate
Gas usage often increases in colder months due to:
longer hot showers
space heating
higher overall hot water demand
This is particularly noticeable in cooler regions such as Canberra, Hobart, Melbourne and regional New South Wales, where winter temperatures can significantly increase LPG usage.
In warmer climates, such as Brisbane, the Gold Coast, Sunshine Coast, Cairns and Townsville usage is often more consistent throughout the year, especially for households using LPG primarily for hot water and cooking rather than heating.
Appliance Efficiency
Newer, energy-efficient appliances generally use less gas than older models. Poorly maintained systems can also consume more LPG than necessary.
How CompareLPG
Helps You Understand Your LPG Costs
How CompareLPG
Helps You Understand Your LPG Costs
CompareLPG helps remove the guesswork by focusing on accurate pricing for your location. Here’s how it works:
Rather than broad estimates, we focus on what applies to your home.
How Long a 45kg Gas Bottle Lastsby Location
While usage patterns are similar across Australia, climate and household needs can vary by region.
You can also explore LPG pricing and supply in your area through our location pages, including:
- Sydney
- Melbourne
- Brisbane
- Gold Coast
- Sunshine Coast
- Canberra
- Hobart
- Toowoomba
- Townsville
- Central Coast
Each page looks at local supplier coverage and pricing considerations.
How Usage Affects LPG Pricing and Supplier Choice
Usage levels can influence:
which pricing structure suits you best
how noticeable rental fees feel
how often delivery charges apply
For high-usage homes, a lower refill price may be more important. For low-usage homes, rental fees may make up a larger share of costs.
That’s why address-specific pricing matters.
How Many 45kg Gas Bottles Does a Home Use Per Year?
This varies, but as a rough guide:
- Cooking only: 2–4 bottles per year
- Hot water + cooking: 6–12 bottles per year
- Hot water + heating: potentially more, depending on usage
Understanding your annual usage helps you better estimate total LPG costs, not just the price per bottle.
Why Usage Matters When Comparing LPG Prices
Knowing how long a bottle lasts is important because it directly affects your overall spend. For example:
- households using 10–12 bottles per year are more sensitive to refill pricing
- low-usage homes may feel rental fees more strongly
- delivery frequency can impact total cost
That’s why it’s important to look at total yearly LPG costs, not just a single refill price.
Does Bottle Size Affect How Long Gas Lasts?
Yes, but 45kg bottles are the standard size for residential LPG supply in Australia.
Smaller bottles (such as BBQ cylinders) aren’t suitable for household supply. A 45kg bottle provides a good balance between capacity, delivery frequency and reliability. However, if you’re only running a gas stove, a 9kg bottle can be a good option.
Most residential systems are designed specifically for two 45kg bottles, ensuring uninterrupted gas supply.
What Happens When a 45kg Gas Bottle Runs Out?
Most homes use an automatic changeover valve.
When one bottle empties:
- gas supply automatically switches to the full bottle
- you don’t lose gas
- you have time to arrange a refill
This system helps avoid interruptions and allows suppliers to schedule deliveries more efficiently.
How to Estimate Your Own Gas Usage
If you’re unsure how long your bottles last:
check previous delivery dates
review invoices or delivery history
note how often bottles are replaced
This gives you a clearer picture when comparing options or reviewing costs.
Contact us for pricing
How to Get Pricing Based on Your Usage
If you want to understand how your usage translates into cost, complete our form today and we’ll check which LPG supplier services your home and what their current pricing looks like.
The service is 100% free, and there’s no obligation to switch.
Frequently Asked Questions
How long does a 45kg gas bottle last for cooking only?
Often several months, depending on how frequently cooking appliances are used. Maybe consider a 9kg bottle.
Does using LPG for hot water use more gas?
Yes. Hot water systems are typically the largest gas users in a home.
Do gas bottles empty faster in winter?
Often, yes, particularly in homes using LPG for heating or longer showers.
Is CompareLPG free to use?
Yip, completely free, with no obligation to proceed.
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