The results from this calculator should be used as a guide only with respect to potential costs of gas and electric appliances. The actual costs may vary based on the appliance that is used, the manner in which it is installed and various charges, tariffs and other costs that may be imposed by retailers/energy providers.
This calculator is only intended to provide a general indication of potential energy savings that could be achieved through the use of gas appliances based on the following assumptions with respect to appliances and usage:
Hot water systems have been calculated with a 50 degree temperature rise for both instantaneous and storage systems, 50 litres of hot water per day for a single household, 100 litres for a couple, 200 litres for a small family and 300 litres for a large family per day. For comparison of instantaneous hot water savings, an instantaneous gas hot water system is compared with an electric storage hot water system. Rates have been calculated assuming use of 5 Star appliances for storage systems and 6 Star rating for instantaneous.
The energy usage for all cooktops has been calculated on the basis of two hotplates in use at 100% efficiency. Usage assumptions – Single and Couple households: 75 hours of use annually, Small Families 150 hours annually, Large Families 225 hours annual use. Natural Gas calculated using Westinghouse WHG646SA cooktop, rated at 40.6 MJ/hr. Electric calculated using Westinghouse WHS642WA cooktop rated at 6.5 kWh.
The energy usage for all heaters has been calculated at 3 hours of use for Single, Couple and Small Family households, and 4 hours for Large Families, averaged over 90 days per year. Natural Gas calculations are based on using Rinnai Ultima II Console with heat output at 5.2 kW, running at 25% of capacity for Single and Couple households and 50% capacity for Small and Large Families. Electricity usage has been calculated using Dimplex Eco 2.4kWh Column Heater running at 50% capacity for Single and Couple households and 100% capacity for Small and Large Families.
Natural Gas and LPG Barbecues assume use of the Premium Beefmaster 6 Burner Built in BBQ M-Series in use 12 hours per year for Single and Couple households, 20 hours for Small Families and 30 hours for Large Families, with 6 burners in use at 100% efficiency.
Westinghouse WVG613S and WVE613S stainless steel fan forced ovens have been used for comparison, assuming1 hour of use per day for 50 days for Single and Couple households with one hour use for 100 and 150 days for Small and Large Families respectively.
Natural Gas calculations are based on the use of Rinnai Gas Dryer Dry-Soft 6 and electric using Electrolux 6kg EDV6051 Dryer. All dryers calculated as 100% efficient with 26 cycles per year for Single and Couple households, 52 cycles for Small Families and 78 cycles for Large Families per year. Natural Gas calculations assume the drying time per cycle is 1.28 hours and electric assumes 2.36 hours.
We have assumed that all fireplaces run for 90 days per year. Natural Gas calculations are based on Mezzo 1000 Decorative Fire with 6.8 kW output, running at 33% capacity for 3 hours per day for Single, Couple and Small Family households, and at 4 hours for Large Families. The electric calculations are based on Gallery Linear Fireplace GE 94 with 2.4 kW output, running at 100% capacity for 3 hours for Single, Couple and Small Family households and at 4 hours for Large Families.
All costs for Natural Gas, LPG and Electric derived from existing tariffs and prices set by major retailers as of August 2018. Standing charges have not been included as part of the comparison.
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