Electric Hot Water Systems

Frequently Asked Questions About Electric Hot Water Systems

What is an electric hot water system?

An electric hot water system is a water heating solution that uses an electric heating element submerged in an insulated storage tank to heat and store hot water for household or commercial use. Available in various tank sizes from 25L to 400L, electric systems are the most widely installed type of hot water system in Australia due to their simple installation, low upfront cost, and compatibility with all homes regardless of gas availability. They are available in both off-peak and continuous tariff options, allowing you to take advantage of lower electricity rates overnight.

How does an electric hot water system work?

An electric hot water system heats water using one or two electric heating elements submerged inside an insulated storage tank. When the water temperature drops below the thermostat’s set point, the element switches on and heats the water to the set temperature — typically 60 degrees Celsius. The insulated tank retains heat between cycles to minimise energy use. Hot water is stored at the top of the tank and drawn off when a tap is opened, with cold water entering at the bottom to be heated. A pressure relief valve prevents dangerous pressure buildup inside the tank.

How much is an electric hot water system?

Electric hot water system costs in Queensland vary based on tank size, brand, and installation requirements. Fully installed systems typically range between $1,100 and $3,400+, with compact 50L–80L units available from around $500–$800 for supply only. Larger family-sized systems (315L–400L) including supply and installation generally sit between $1,800 and $4,000+. Popular brands such as Rheem and AquaMAX offer a wide range of options at different price points. SunCity Hot Water provides free quotes across the Sunshine Coast, Brisbane and Gympie — call 1300 728 122 for an accurate price for your home.

How long does an electric hot water system last?

A quality electric hot water system typically lasts 10 to 15 years with regular servicing. The heating element and thermostat are the components most likely to need attention during the system’s life and can often be replaced without replacing the whole unit. The tank itself can corrode over time — a sacrificial anode rod inside the tank slows this process and should be checked every 5 years. SunCity Hot Water provides servicing and repairs across the Sunshine Coast, Brisbane and Gympie — call 1300 728 122 to book.

What is the best electric hot water system?

The best electric hot water system depends on your household size and usage patterns. Popular and reliable options for Queensland homes include the Rheem Stellar (available 125L–400L), AquaMAX (Australian-made with excellent warranty, 250L–400L), and Dux Proflo (compact and cost-effective for smaller households). Off-peak models can significantly reduce running costs by heating overnight on cheaper electricity tariffs. SunCity Hot Water stocks and installs all major brands — call 1300 728 122 for a recommendation tailored to your home across the Sunshine Coast, Brisbane and Gympie.

How do I turn off an electric hot water system?

To turn off an electric hot water system, locate the dedicated circuit breaker in your switchboard — usually labelled HWS, HOT WATER, or similar — and switch it off. This cuts power to the heating element without affecting the water supply. To fully isolate the system for maintenance or extended absence, also turn off the cold water supply valve at the base of the unit. If your system is leaking or the pressure relief valve is releasing hot water, turn off both power and water immediately and call SunCity Hot Water on 1300 728 122 for urgent repairs across the Sunshine Coast, Brisbane and Gympie.