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Electric Hot Water Systems: How It Works?

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Electric hot water systems can be storage or constant flow systems.

In most houses in Melbourne, Australia, however, an electric hot water system will be a storage system.

What is a Storage system?

Electric storage systems heat water with an ingredient in the bottom of the unit and store it in an insulated tank ready for use right through the day. Mains pressure systems are the most frequent type of storage system and give hot water at an akin pressure and flow rate as cold water.

This lets more than one outlet (tap) to be utilized at a time in the house without disturbing supply pressure. Distinct from gas hot water systems, electric water heaters can be situated inside or outside, as there is no pipe necessary.

All storage systems lose some heat through the tank walls, so they still use energy even if you don’t use any hot water. This is why it’s significant to buy an efficient, high star-rated water heater that has an insulated storage tank. For small households, these fixed heat losses can encompass a high proportion of largely hot water energy use.

Note down that electric hot water storage systems need a bigger storage capacity than gas units to supply the same amount of hot water.

Tariffs and electric hot water systems

Electric hot water systems are focused to various time-of-use tariffs, depending on the size of the tank storage.

If your storage tank is 160 liters or less or you have an immediate system, you will be charged at the more costly peak tariff.

If you have a storage system that is larger, you can shift to a cheaper off-peak tariff where the electrical energy is supplied to the system during the night at a lower tariff.

Flexible pricing

Flexible pricing options apply to the total electricity usage, not only the electricity use of the water heater.

If you own an electric hot water heater on an off-peak tariff and you are taking into consideration changing to a flexible pricing plan, discuss with your energy retailer to confer your options.

Usually, every person uses about 50 Liters of hot water daily; more if you utilize your  dishwasher frequently, take very long hot showers or frequently wash clothes in warm or hot water.

Obtain a Electric Hot Water System supplier to analyze your home and usage and suggest some options. To find out the right size of system, a supplier must ask how many individuals live in your home, how much hot water you consume, and when you use it. For instance, do you all take a shower in the morning or evening? Do you wash your clothes clothes in hot or cold water? Get quotes from at least 2 suppliers.


  • An electrically heated storage tank system is relatively cheap to buy and install, however is usually the most expensive to run, particularly if it’s on the continuous (full day) rate.
  • Systems that run on off-peak electricity are cheaper to run, but need a larger tank as the water heated during the night has to last you all day. And off-peak electricity is not available to all homes.

Note: Continuous flow Electric hot water systems work by heating the water on demand, relatively than heating and storing it. When the hot water is on at the tap, cold water is fed all the way through a heat exchanger that heats the water and sends it through the piping. The majority of continuous flow electric systems need a three phase electricity supply to operate (normal domestic wiring in Melbourne, Australia is single phase). For more info, check out this website: www.ringhotwater.com.au

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