Calulator

Household Size

Your household size and the number of occupants directly influence your hot water demand. The larger the family, the more hot water is usually required. When considering the right size for your hot water system, you should consider the number of people living with you.

When considering the hot water demand, take into account various activities that contribute to the consumption. These activities include showering, dishwashing, laundry, and other hot water usage in your household.

Identifying peak usage times is also vital in estimating how much hot water you need during specific periods. For example, mornings or evenings might be the peak showering times, requiring a higher flow rate to meet the demand.

What Size Water Heater Do I Need for a Family of 4?

A family of four in Australia typically requires a water heating system that can provide around 125 to 360 litres daily. Bear in mind that this size will depend on certain factors, including the type of heater used and the frequency of water consumption.

Electric Hot Water System Size Guide (Storage)

Household Size	Off-Peak Tariff (Tank Size)	Continuous Tariff (Tank Size)
1 - 2 people	125 litres	50 litres
2 - 3 people	160 litres	80 litres
3 - 4 people	250 litres	125 litres
4 - 6 people	315 litres	160 litres
6 - 9 people	400 litres	250 litres