Heating running costs

Close-up of a hand on a wall-mounted temperature control unit

The table below provides approximate annual running costs for a range of types and sizes of different heating options.

Room size Heater types Energy star rating Annual energy cost Annual GHG emissions (kg/yr)
Room / Space heating
Small room 12m2 Gas heater 3 star rating $170 345
5 star rating $140 290
Portable electric heater N/A $385 1410
Reverse-cycle air conditioner 2 star rating $140 510
5 star rating $85 300
Medium room 30m2
Gas heater 3 star rating $395 845
5 star rating $340 720
Electric panel, convection or fan heater N/A $935 3460
Reverse-cycle air conditioner 2 star rating $310  1140
5 star rating $200 730
Large area 60m2 Gas heater 3 star rating $730 1685
5 star rating $625 1440
Electric panel, convection or fan heater N/A $1860 6825
Reverse-cycle split system air conditioner (8kW) 1.5 star rating $640 2365
4 star rating $440 1620
Central heating
Small house 100m2 Gas ducted heating Not zoned 3 star rating $1130 2825
4 star rating $995 2485
6 star rating $860 2145
Zoned 3 star rating $1125 2810
4 star rating $990 2465
6 star rating $855 2130
Gas hydronic Not zoned Standard $1035 2520
High $865 2100
Zoned Standard $1030 2505
High  $860 2085
Ducted reverse-cycle air conditioner Not zoned 2 star rating $975 3600
4 star rating $680 2505
Zoned 2 star rating $970 3580
4 star rating $675 2490
Medium house 160m2 Gas ducted heating Not zoned 3 star rating $1705 4520
4 star rating $1495 3975
6 star rating $1295 3430
Zoned 3 star rating $1690 4490
4 star rating $1485 3945
6 star rating $1285 3410
Gas hydronic Not zoned Standard $1555 4030
High $1295 3360
Zoned Standard $1545 4005
High $1290 3340
Ducted reverse-cycle air conditioner
Not zoned 2 star rating $1500 5550
3.5 star rating $1150 4245
Zoned 2 star rating $1495 5515
3.5 star rating $1140 4215
Large house 220m2 Gas ducted heating Not zoned 3 star rating $2265 6215
4 star rating $1990 5460
6 star rating $1720 4720
Zoned 3 star rating $2250 6175
4 star rating $1975 5425
6 star rating $1705 4685
Gas hydronic Not zoned Standard $2060 5545
High $1720 4620
Zoned Standard $2050 5505
High $1705 4590
Ducted reverse-cycle air conditioner Not zoned 2 star rating $2030 7500
3.5 star rating $1580 5830
Zoned 2 star rating $2015 7455
3.5 star rating $1570 5790

* Approximate costs per year, based an average existing (pre-2005) 2-Star house in a Melbourne climate, heating to 20oC all day on the weekend (7am to 10pm) and in the morning (6am to 9am) and evening (5pm to 11pm) on weekdays, as needed. 
Based on  an electricity tariff of 31.9c/kWh. Gas tariffs are based on a declining block structure, which means the unit cost of gas decreases as gas use (or area being heated) increases. Gas tariffs used for room heating: 12m2 – 2.75c/MJ; 30m2 – 2.64c/MJ; 60m2 – 2.45c/MJ.
Gas tariffs used for central heating: 100m2 – 2.32c/MJ; 160m2 – 2.17c/MJ; 220m2 – 2.09 c/MJ. The energy tariffs do not include any pay on time discount, or any fixed supply charge.
The figures for "zoned" operation assume that heating in the bedroom areas is switched off during the day (9am to 5pm) on the weekends. The zoning does not affect the operation of the heating on weekdays, as the house is not occupied during this time and the heating is assumed to be off. Other zoning arrangements are possible, and would change the saving achieved by zoning.

Actual costs for your house will depend on the area heated, how long you run the heating for, your thermostat settings, how well insulated the house is, your energy tariffs and your local climate. To estimate the running cost for a cold climate (e.g. Ballarat) multiply these figures by 1.3, and for a warm climate (e.g. Mildura) multiply these figures by 0.7.
To estimate the running cost for a 5-Star house in a Melbourne climate multiply these figures by 0.4, and for a 6-Star house multiply these figures by 0.3.

 

Resources


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