Electricity  Saving  Solutions


Office:   02-8064-3992    02-8064-3992         Mobile:  0428-449-422    0428-449-422

Home Electricity Saving Solutions Australia


Not Happy With Your Electricity Metering And Billing?   Wondering Why You Are Using So Much Power?   Get The Data You Need To Make Sense Of Your Consumption And Solar Power   Help Is ONLY A Phone Call Away! 02 8064 3992

Aussie Home Energy



AHE - Aussie Home Energy Blog 

Aussie Home Energy Mobile Site



Site Updated
Tuesday, 16 July 2019 





Aussie Home Energy On Facebook



Energy Saving Services & Products Online Shop








Phone Help Australia Wide Consultation

Aussie Home Energy Power Saving Services




Smart Solar Power - Export Reduction Dashboard






Aussie Home Energy Saving Services




Aussie Home Energy Blog




Aussie Home Energy's Worldwide Electricity News


Aussie Home Energy Newsletter





Aussie Home Energy Customer Feedback







On Facebook As AussieHomeEnergy
On Twitter As @Energy_Assessor
On Twitter As @Energy_Monitor
On LinkedIn As AussieHomeEnergy




Paypal Credit Card Payments

Advisory Services



Aussie Home LPG Gas Information

  • ELECTRICITY - Knowing more about your electricity supply, will help you save off rising power costs
  • WATER - Some interesting facts about town & rainwater supplies


We Are Not An LPG Gas Supplier


What Do You Know About Your LPG Gas Supply

We have created this page to share interesting information which most of you are unaware of but commonly are in search for. Hopefully this information will serve as a starting point when comparing appliances that run off gas to those powered by electricity.



45kg LPG Gas BottleHow Much Energy Is There In A LPG Gas Bottle?

This has been a common question asked by our clients over the years, when they are wanting to compare gas to electricity. Here are some simple facts about LPG gas versus electricity:


  • 1 kg of LPG gas contains 50.4 MJ [Mega Joules] of energy
  • 1 kWh of electricity = 3.6 MJ of LPG gas
  • One 45 kg LPG gas bottle [45 kg x 50.4 MJ = 2268 MJ of energy
  • Other bottle sizes are: 9 kg = 453. 6 MJ : 2 x 45 kg bottles = 4536 MJ


    Other useful information:

  • Green House Gas [CHG] Emissions 3.6 MJ Gas = 0.2 kg CHG
  • CHG for coal fired electricity = 1.4 kg CHG
  • 1000 Mega Joules = 1 Giga Joule
  • 1 x 45 kg LPG gas bottle = 630 kWh of electrical power
  • 1 X 45 kg LPG gas bottle contains 88 litres of LPG [Propane] gas
  • Dimensions of a 45 kg bottle are height 125 cm X diameter 37.5 cm
  • 1 litre of LPG gas weighs 0.51 kg
  • 1 kg of LPG gas has a volume of 1.96 litres
  • 1 MJ of LPG gas equals 948 BTU [Imperial system of measurement]
  • Weight of empty 45 kg LPG gas bottle [Tare weight] 33 kg [Older bottles more, newer less]
  • Download the above information as a quick LPG 45 KG GAS BOTTLE INFORMATION GUIDE



What Is Cheaper Per Unit Of Energy, Gas Or Electricity?

Let us say you pay $135 for a 45 kg bottle of LPG gas, which has the equivalent electrical energy of 630 kWh.

Maths being $135 / 630 kWh = 0.21 cent per kWh of comparable electrical energy. So are you paying more or less than this 21 cent per kWh figure?

The above does not take into account the efficiency of any appliance [most appliances are not 100% efficient, see the star ratings for more information] and other operational variables such as ambient temperature. The figure is a starting point for further investigation.



How Long Does A 45 kg LPG Bottle Last?

Firstly you will need to know how much gas your appliance uses in MJs per hour. This may be stated on the appliances Australian standardised 'energy label'. If your appliance does not have an energy label then the required gas maybe stated in the specification section of the instruction manual, or on the appliances information plate.

The following example uses a gas heater with 12.6 MJ consumption of gas per hour. The consumption figure assumes it is on full or high. This does not take into account any thermostatic control, which will reduce the gas used and therefore extend the hours of operation.


    1. Divide the total energy within a 45 kg bottle 2268MJ by the heaters hourly rating of 12.6 MJ/h

    2. A full gas bottle will power our heater on full for 180 hours.

    3. If the gas heater is operated for 3 hours per day, the gas would last for approximately 2 months. Maths being 180 hours / 3 hours per day = 60 days thus 2 months.



Annual Gas Energy Rating LabelHow Many Bottles Will I Need A Year?

For this example we will use a gas water heater. The energy label clearly suggests a yearly gas consumption of 22,200 MJ per year.

This is divided by 365 resulting in an average daily use of 61 MJ per day.

The number of LPG bottles required per year can be easily worked out by dividing the suggested annual gas consumption of the appliance by the total amount of gas an LPG gas bottle contains.

22,200 MJ / 2268 MJ = 9.78 bottles therefore 10 bottles per year are needed.

What we are not told by this label is the number of MJs this appliance uses on an hourly basis.




Checking The Level Of LPG Gas In A Bottle

To check the level of LPG gas in a bottle, it is a fairly easy process.

If you do not know the science of LPG gas, you may be interested to learn about how it is stored.

LPG is stored under pressure as a liquid. This gas in effect boils at minus forty two degrees, to turn from liquid into a gas. During this conversion of liquid to gas, there is considerable heat drawn from the steel wall of the bottle and the ambient air outside of the bottle. Thus the side of the gas bottle will feel colder where the liquid LPG gas is inside.

The above is even more obvious when you are using gas, as more of the liquid is turning to gas at that time. Under some circumstances where gas usage is high, ice can form on the outside of the gas bottle or the fittings.

If there is a situation where no matter how hard you try, you cannot feel the difference on the outside of the LPG gas bottle, try the following.

Pour hot water down the outside of the gas bottle. Do not use boiling water and take the necessary safety precautions not to injure yourself or your helper. You will need to pour enough hot water to heat the steel wall of the bottle a few degrees. The steel above the level of the gas, will retain it's heat longer than the level of steel where the gas is inside the bottle. Hence it will feel warmer above the gas and cooler below the level of gas. You may need to wait a few seconds or you may notice a line of condensation, corresponding to the level of gas in the bottle.



What Is The Cost Of A 45kg LPG Gas Bottle?

This can vary quite a lot in price, as delivery costs can really hike the total cost! The price we pay for bottled LPG gas currently [October 2011], is $130 delivered. There is a bottle rental of $30 per year, per bottle.

You may get a better deal by bundling gas and electricity together.



Flueless / Unflued Gas Heaters

Un-Flued Gas Heater - Safe Or Unsafe?Have You Adequate Cold Air Ventilation During Operation?

In most manufacturers documentation it states adequate ventilation is a requirement! How much ventilation though and what type on a cold night, results in most homes we have visited having NO VENTILATION!

What Is The Open Window Requirement?

The open window requirement means you get the required amount of fresh air into the room, when you have no forced air flow such as a ducted fan system.

The required ventilation is based on 5% of your floor area [when a standard ceiling height is used]. Use the table below to give you an idea of a comparable window size that you should have open, to supply this required ventilation.



COUGH : Campaign Opposing Unflued Gas Heating


LPG Un-Flued Gas Heater Adequate Ventilation

Room Size m2

5% Ventilation Requirement

Open Window Required m2



0.3 X 0.9 = 0.27



0.6 X 0.9 = 0.54



0.6 X 1.2 = 0.72



0.9 X 1.2 = 1.08



0.9 X 1.5 = 1.35



0.9 X 1.8 = 1.62



1.2 X 1.5 = 1.8



1.2 X 1.8 = 2.16



1.5 X 1.5 = 2.25



1.5 X 1.8 = 2.7

Home Energy Reduction Services & Products AUSSIE HOME ENERGY

In layman's terms this means:


Every 10 square metres of floor area requires an
OPEN window of 0.6 x 0.9 metres!


Now on a cold night, none of our clients when asked were going to do that! So we know the required ventilation is not being applied in most homes!

Remember for manufacturers to sell these devices, they usually have stated the required ventilation in the appliances manual. It is up to you to make sure read this documentation. A problem could occur with your health, if you DO NOT take the necessary steps to ventilate your home correctly! Always read operation manuals before purchase!



Why Not Check Out Our Electricity And Solar Monitoring Solutions

We know there are a lot of you not happy with your electricity bill costs! Did you know by monitoring your electricity you could save up to 20% off your power costs.

When you install electricity monitoring in your home you will have the tools and data needed to see where you are spending and therefore be in a position to start saving.


Measure It To Manage It


Home Electricity Monitoring Solutions


We Are Not An LPG Gas Supplier


Aussie Home Energy : LPG Gas Information


Office: 02-8064-3992  02-8064-3992     Mobile: 0428-449-422  0428-449-422


AHE - Aussie Home Energy Site News 


Meter And Billing Analysis
Power Audits Mid North Coast
Telephone Audit Australia
Strata Apartment / Group
LED Light Assessment

Aussie Home Energy
Home Page
About Us
Contact Us
Site Map

Energy Monitoring
Choosing Your Monitor
Monitoring System #1
Monitoring System #2
School Monitoring Projects
School Canteen Analysis
Residential Monitoring
DIY Third Party Projects

DIY Electricity Audit
DIY Power Audit Solution
Spreadsheets & Forms

Information : Guides
Energy Reduction Guides
Electricity Saving Articles

Solar Power
Solar Power Monitoring
Factors Affecting Output
NET Fit Metering & Billing
Types Of NET Meter
Solar Power Alerts
SMART Solar Power Diversion

Website News

Keep In Touch

Electricity Information
Wasted Electricity
Supply Problems
Bill Errors
Electricity Concerns

Home Energy
LPG Gas Information
Tank Water V Mains

Low Energy Lighting





Alternative Uses For 50W Of 24/7 Wasted Standby Power?


Content and Intellectual Property Is Under Copyright Protection.
Copyright ©2009-2019 All Rights Reserved Worldwide : Aussie Home Energy

This Page Updated Tuesday, 16 July 2019  ABN 89 945 871 580

This Site Created By ASG Website Design