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## What is one unit of gas?

Kilowatt-hour (kWh) is the unit of energy most commonly for recording energy consumption and is the same as your electricity bill. One kWh is that amount of energy that would power a device that consumes a kilowatt of power for one hour (1 kilowatt hour = 3,600,000 joules or 3.6 megajoules).

The gas meter installed at your property measures your gas usage in cubic meters or cubic feet, depending on the meter. In order to convert this measurement into kWh we need to apply a conversion factor.

The conversion factor is a measurement of the heat content of the volume of gas measured. It is used to convert the measured volume of gas into the quantity of energy (kilowatt-hours) contained in that gas. The conversion factor can vary depending on the source of the gas and the location. These variations are normally small and the conversion factor used for calculating your bill will be published on the bill.

## Examples for energy use by gas appliances:

• The small burner on your gas cooker (typically 1.1 to 1.3 kW output) will use approx 1kWh to 1.5 kWh in one hour.
• A 2kW gas fire will use approx 2kWh in one hour when operating at maximum output.
• It would take approx 9.2 kWh of gas to heat a 120 litre hot water tank by 60 degrees Celsius (based on approx 90% boiler efficiency).

## How much is it costing me?

Try our appliance calculator to work out how much money your household appliances use - and find out ways you could save.

## Find out more

1. See how you can save on energy costs with our online energy wizard.
2. Take a 3D tour of home energy efficiency in our energy efficient house.