Electric Hot Water Heaters: How to Choose the Right Electric Hot Water System for Your Home

Choosing the right electric hot water heater is not just about replacing the old tank with the same size. The best option depends on your household size, shower habits, available space, electrical setup, running cost expectations and whether you want a standard electric storage unit or a more efficient heat pump alternative.

For many Australian homes, electric hot water systems remain a practical and widely used choice. They are simple, familiar, available in several storage sizes and suitable for homes without natural gas. However, choosing the wrong size or ignoring installation requirements can lead to higher running costs, poor hot water recovery or a system that still runs out of hot water during peak use.

Installed Today offers online supply-only ordering across major Australian metro areas, with selected supplied-and-installed options available on eligible products in Brisbane and Gold Coast service areas.

Quick Answer: What Is the Best Electric Hot Water Heater?

The best electric hot water heater is the one that matches your household’s hot water demand, electrical supply and available installation space.

As a general guide:

• A smaller household may suit a compact or mid-sized electric storage system

• A family home often needs a larger storage tank, commonly around 250L, 315L or 400L

• A home that regularly runs out of hot water should not automatically replace the old unit with the same size

• A home focused on lower running costs may be better suited to a heat pump hot water system

• A home with limited space may need careful product selection before ordering supply only

Before ordering, confirm the correct size, electrical requirements, access, valves, drainage and installation position with your licensed installer.

Electric Hot Water Heaters Explained

An electric hot water heater uses electricity to heat and store water inside an insulated tank. When hot water is used at taps, showers or appliances, cold water enters the tank and is reheated by the electric element.

The most common residential option is an electric storage hot water system. These units are popular because they are straightforward, reliable and available in a range of capacities. They are often used in homes where there is no natural gas connection, where a simple like-for-like replacement is preferred, or where the property already has the correct electrical provision for storage hot water.

You can compare broad replacement options in the hot water systems collection, including electric, gas, instant gas and heat pump models.

Main Types of Electric Hot Water Systems

Standard Electric Storage Hot Water Systems

Standard electric storage systems are the most familiar type of electric hot water heater. They heat water inside a storage tank and keep it ready for use.

They can suit:

• Homes without gas

• Rental properties

• Family homes needing stored hot water

• Like-for-like replacements

• Homes where simple product selection is preferred

Common sizes include 250L electric hot water systems, 315L electric hot water systems and 400L electric hot water systems.

A 250L unit may suit many small-to-medium households, but larger families or homes with high shower use may need 315L or 400L depending on usage patterns.

Instant Electric Hot Water Systems

Instant electric hot water systems heat water as it passes through the unit rather than storing a full tank of hot water.

They are usually better suited to smaller point-of-use applications, such as:

• Sinks

• Small offices

• Granny flats

• Compact spaces

• Low-demand hot water points

They are not always the best choice for whole-home shower use because electrical demand can be high. A licensed electrician or plumber should confirm whether the property can support the unit before ordering.

Heat Pump Hot Water Systems

A heat pump hot water system is still electric, but it works differently from a standard electric storage tank. Instead of relying only on an electric element, it uses heat from the surrounding air to help heat the water.

Heat pumps can be a strong option where running cost matters, but they are not automatically right for every home. They need suitable airflow, outdoor location, condensate drainage, access for installation and a sensible noise location.

Medium family homes often compare products in the medium heat pump hot water systems 200L–280L range, while larger households may need to look at large heat pump hot water systems.

Some heat pumps can also pair well with rooftop solar where the timer settings, usage pattern and electrical setup suit.

Choosing the Right Electric Hot Water Size

Correct sizing is one of the most important parts of choosing an electric hot water heater.

A system that is too small may run out during busy periods. A system that is too large may cost more upfront and may not be the most efficient choice for the household.

When choosing a size, consider:

• Number of people in the home

• Number of bathrooms

• Shower length and timing

• Bath use

• Dishwasher and laundry habits

• Whether hot water use happens mostly in the morning, evening or throughout the day

• Whether the existing system was running out of hot water

• Whether the property uses off-peak or controlled-load electricity

• Available installation space

If your current electric hot water system regularly runs cold, replacing it with the exact same size may repeat the same problem.

250L Electric Hot Water Systems

A 250L electric hot water system is a common choice for many small-to-medium Australian households.

It may suit:

• Couples

• Small families

• Homes with moderate shower use

• Like-for-like electric storage replacements

• Properties where space is limited compared with larger tanks

Popular options include the Rheem 250L Electric Hot Water System, Rinnai 250L Electric Hot Water System, Dux 250L Electric Hot Water System and Vulcan 250L Electric Hot Water System.

315L Electric Hot Water Systems

A 315L electric hot water system may suit larger households or homes where 250L has not been enough.

It can be a better fit for:

• Families with higher shower use

• Homes with multiple bathrooms

• Households using hot water at similar times each day

• Properties wanting more stored hot water capacity

A larger tank still needs the right electrical setup, installation space, drainage and access. Confirm these details before ordering supply only.

400L Electric Hot Water Systems

A 400L electric hot water system is generally aimed at high-demand homes.

It may suit:

• Larger families

• Homes with several bathrooms

• High evening or morning hot water demand

• Properties using off-peak electric storage

• Households that regularly run out of hot water on smaller systems

A larger system can provide more stored hot water, but it is not always the most efficient answer. In some homes, a heat pump or different hot water type may be worth comparing before committing to a large electric storage unit.

Electric Storage vs Heat Pump Hot Water

Standard electric storage and heat pump hot water systems are both electric options, but they suit different priorities.

If the goal is a straightforward like-for-like replacement, electric storage may be practical. If the goal is to reduce ongoing energy use, comparing heat pump hot water systems is worthwhile.

Rebates, STCs and incentives can change, so check current eligibility before relying on them in your budget.

Electric vs Gas Hot Water

Electric hot water is not the only option. Some homes may also compare gas hot water systems, especially where natural gas or LPG is already available.

Gas systems can include gas storage and instant gas hot water systems. Instant gas units are commonly compared in 16L, 20L and 26L sizes, with 26L instant gas hot water systems often considered for larger households.

Gas work must be completed by a licensed gas fitter. Natural gas and LPG units are not interchangeable, and the correct gas type must be selected. For larger instant gas systems, gas pipe sizing and water pressure must also support the unit.

Electric hot water may be a better fit where gas is not available, where the home already has a suitable electric setup, or where the customer wants to compare electric storage and heat pump options.

Important Safety and Compliance Considerations

Electric hot water systems involve electricity, plumbing, water pressure, valves and drainage. They should not be installed by homeowners as a DIY job.

A licensed installer may need to check:

• Electrical supply and circuit suitability

• Element size and power requirements

• Safe isolation of the old unit

• Tempering valve requirements

• Pressure limiting valve requirements

• Expansion control valve requirements

• Drainage and overflow discharge

• Location and access

• Compliance upgrades

• Existing pipework condition

• Whether the selected unit matches the property

For supply-only orders, the product price does not include installation, valves, electrical work, gas work, pipework changes, drainage, old unit removal, disposal or compliance upgrades unless those options are clearly selected or shown on the product page.

Installation Location Matters

Before ordering an electric hot water system, check where the unit will be installed.

Important location factors include:

• Indoor or outdoor suitability

• Access width for delivery and installation

• Base condition

• Drainage point

• Overflow discharge location

• Distance to bathrooms and fixtures

• Available height and clearance

• Weather exposure

• Electrical connection point

• Future service access

Even when replacing a similar unit, the existing position may no longer meet current requirements. An installer should confirm whether the location is suitable before ordering.

Brisbane and Gold Coast Considerations

For Brisbane and Gold Coast homes, electric hot water selection often comes down to household size, tariff setup, outdoor access and whether the existing unit is being replaced like-for-like.

Older homes may have ageing valves, older pipework, tight access or non-compliant drainage. Newer homes may be better suited to heat pump upgrades where outdoor space, airflow and electrical suitability are available.

Installed Today offers supply-only ordering across major Australian metro areas, with selected supplied-and-installed options available on eligible products in Brisbane and Gold Coast service areas.

Common Mistakes When Buying an Electric Hot Water Heater

Replacing the Same Size Without Checking Usage

If the old system constantly ran out of hot water, the same size may not fix the issue. Compare household demand before ordering.

Ignoring Electrical Requirements

A hot water system must suit the property’s electrical setup. Some products may need electrical changes that are not included in supply-only pricing.

Forgetting About Valves and Compliance Upgrades

Old valves may need replacement during installation. Supply-only product pricing does not automatically include valves, pipework changes, drainage or compliance upgrades.

Choosing Heat Pump Without Checking Location

Heat pumps need airflow, outdoor space, condensate drainage and suitable noise placement. They are efficient in the right setting, but not perfect for every property.

Choosing Instant Electric for Whole-Home Demand Without Advice

Instant electric units can suit small point-of-use applications, but whole-home use may require significant electrical capacity. Always confirm suitability first.

Before Ordering Checklist

Before ordering an electric hot water system, confirm:

• The number of people in the home

• Whether the old system ran out of hot water

• The current tank size

• The available installation space

• Whether the unit is indoor or outdoor

• Electrical supply requirements

• Access for delivery and installation

• Drainage and overflow requirements

• Whether new valves may be needed

• Whether you want supply only or an eligible supplied-and-installed option

• Whether a heat pump may be a better long-term option

• Installer approval before ordering supply only

Frequently Asked Questions

What size electric hot water system do I need?

The right size depends on the number of people in the home, bathrooms, shower habits and when hot water is used. Many homes compare 250L, 315L and 400L electric storage systems, but the correct size should be confirmed before ordering.

Is a 250L electric hot water system enough for a family?

A 250L system may suit some small-to-medium families, but it may not be enough for homes with long showers, multiple bathrooms or heavy morning and evening use. If the old 250L tank was running out, consider a larger size or compare heat pump options.

Is a heat pump better than a standard electric hot water system?

A heat pump can be more efficient in the right location, but it is not automatically the best option for every home. It needs suitable airflow, outdoor space, drainage, electrical suitability and appropriate noise placement.

Can I install an electric hot water system myself?

No. Electric hot water systems involve plumbing, electrical work, valves, water pressure and compliance requirements. A licensed plumber and, where required, licensed electrician should complete the work.

What is not included in a supply-only electric hot water system?

Supply-only generally means the product only. It does not include installation, valves, electrical work, gas work, pipework changes, drainage, old unit removal, disposal or compliance upgrades unless those items are selected or clearly shown.

Should I choose electric storage or instant electric hot water?

Electric storage is usually more common for whole-home hot water. Instant electric may suit smaller point-of-use needs, but whole-home suitability depends on the electrical supply and hot water demand.

Can electric hot water work with solar?

Some electric and heat pump hot water systems may work well with rooftop solar depending on the setup, timer settings and household usage pattern. Confirm suitability with your installer or electrician before ordering.

Final Word

The right electric hot water heater should match the household, not just the old unit sitting in the same spot. Standard electric storage can be a simple and practical replacement, while heat pump hot water may be worth considering where running cost, outdoor airflow and location suitability line up.

Before ordering, compare the correct size, installation requirements and whether supply-only or an eligible supplied-and-installed option is the better fit for your home.