Compare Indoor Gas Heater Prices
Now you can compare prices for all the major brands of indoor gas heaters including:
Rinnai, Everdure, Paloma, Braemar and Cannon
Click on your category of interest to compare prices:
What Size Gas Heater Do I Need?
It is important to get the right size gas heater for your home.
You want to select the ‘Goldilocks’ heater that is just right for your needs.
What to Consider
If you buy too small a heater, it will not be able to adequately heat the intended area.
Selecting a heater that is too large will cost you extra money and oversizing can be unsafe.
A number of things need to be considered when determining your heater sizing:
♦ The volume of the area to be heated including consideration of ceiling height.
♦ The climate zone that you live in.
♦ The physical features of your home including wall & ceiling insulation, window coverings and carpeting.
♦ The kW output of the gas heater, not to be confused with the gas Mj input.
Heating Area Volume & Climate Zone
The required kW output required is primarily dependent upon the area to be heater and the climate zone in which you live. (Please see climate zone map at bottom of page)
The following rough guide assumes your ceilings are no higher than 2.4M:
Very Cold Zone: 1kW output required for each 8.5m²
Cold Zone: 1 kW output required for each 10m²
Cool Zone: 1kW output required for each 13 m²
Mild Zone: 1kW output required for each 16m²
The indicated heating areas would be adjusted down by 5% for each of the following conditions: house built on pillars (non-slab), no carpets on floors, no drapes on windows or a ceiling height exceeding 2.4m.
Deduct an additional 10% if the area does not have ceiling insulation.
Please note that this is only a guide and individual home designs and situations may vary.
Gas Heater Sizing Example #1:
You live in the Cold Zone and you want to heat an area 5m X 10m, which equals 50m².
Because 1kW will heat 10m², you should need a heater with a 5kW output.
Gas Heater Sizing Example #2:
Same as the previous example but in this case your ceilings are over 2.4m and you have wood flooring instead of carpeting.
You would need to deduct 5% for each of these two items.
So, instead of 1 kW heating 10m², it would heat 9m² (10% total reduction).
This means you would need a heater with 5.6 kW of output (50 ÷ 9).
Use kW not MJ
Megajoules per Hour (MJ/hr) ratings on appliances actually indicate the gas consumption of the appliance, not the heat output.
It is often expressed as just MJ.
Kilowatt Hour (kWh or just kW) is how gas heater output is measured.
Energy Efficiency Matters - Star Ratings
So, remember to use kW as a comparison and not MJ.
The efficiency of the heater, in converting gas energy to heat, is a key factor.
For example, a 25MJ heater with a 5.8 Star rating has an output of 6.2kW.
A 25MJ heater with a 2.8 Star rating only has an output of 5.0kW.
As a result, in a Cold Zone climate, they would heat 62m² and 50m², respectively.
This means that the 5.8 Star heater will heat an area 24% larger while using the same amount of gas.
Please refer to the manufacturers’ specifications to determine the exact kW output for each heater you are considering.
Minimum Room Sizing
Some States specifiy the minimum room sizing (volume of room in M³) and minimum ventilation requirements for unflued heaters.
Minimum room sizing also varies between thermostatically controlled and manually controlled heaters.
Portable heaters should not be used in bedrooms, bathrooms or hallways.
All installations must comply with Australian Standard AS5601 - Gas Installations.
Your gas fitter will be able to guide you on many of these points.
Manufacturer Sizing Charts
To make it even easier, most manufacturers have sizing charts, for their heaters, based on climate zone maps.
Take the time to measure the area you wish to heat and use these charts and maps to get the correctly sized heater.
It is always wise to follow the manufacturers' advice.
How long will a gas bottle last using a gas heater?
That depends on the gas consumption rating of the heater being used. Heater gas consumption is expressed in mega joules or MJ of energy.
One litre of LPG has approximately 25MJ of energy content. A 45kg gas bottle contains just a bit more than 88 litres or approximately 2200MJ of energy.