Current Annual Cost
With Tariff 31 Night Rate (Super Economy) you could save
With Tariff 33 Controlled Supply (Economy) you could save
With solar hot water system and Tariff 33 Controlled Supply (Economy) you could save
With heat pump and Tariff 33 Controlled Supply (Economy) you could save
Please note: Negative values mean that option will cost you more than what you currently pay.
Energy Price Fact Sheets are available on our website.
The calculations provided are indicative only. Not all hot water systems or tariffs are suitable for all situations. Refer to information about economy tariffs and hot water heaters for more details. Other factors such as your specific hot water system, location, your individual usage and even the weather can impact your electricity costs. The savings calculated are based on electricity usage only and do not include service fees, metering services charges or material and labour costs charged by your electrician to connect your hot water system to an economy tariff. The savings calculated do not include the cost to purchase or install a new hot water system.
These calculations use the following assumptions:
- Tariffs are at the current gazetted rates and include GST.
- Tariff 11 Residential is 27.071 c/kWh; Tariff 12 Residential (Time-of-Use) off-peak is 0 c/kWh, shoulder is 0 c/kWh, peak is 0 c/kWh; Tariff 13 Residential (PeakSmart Time-of-Use) off-peak is 16.787 c/kWh, shoulder is 22.723 c/kWh, peak is 33.45 c/kWh; Tariff 31 Night Rate (Super Economy) is 15.865 c/kWh; Tariff 33 Controlled Supply (Economy) is 21.956 c/kWh.
- Tariff 12 Residential (Time-of-Use) and Tariff 13 Residential (PeakSmart Time-of-Use) off-peak times are 10pm to 7am daily. Shoulder times are 7am to 10pm on weekends. Shoulder times are 7am to 4pm and 8pm to 10pm on weekdays. Peak times are 4pm to 8pm on weekdays.
- Where Tariff 12 Residential (Time-of-Use) or Tariff 13 Residential (PeakSmart Time-of-Use) is selected, electricity use of the hot water system is assumed to occur as follows: 45% during peak times, 45% during shoulder times, and 10% off-peak on weekdays, and 90% during shoulder times plus 10% during off-peak times on weekends.
- Shower flow is 9L/min and has 40% hot water.
- Solar hot water systems are assumed to use 200kWh/yr.
- Electric storage hot water systems electricity usage is 1 kWh per 15 litres of hot water.
- Heat pump uses 30% of the electricity of an electric storage hot water system.
- Annual costs are based on 365 days, starting on a Monday. If the operating times run past midnight, the extra hours are calculated as part of the same day.