7 Best Electric Instant Hot Water Heaters to Buy in Australia in 2024

Looking for a way to heat wate­r without the inconvenience and waste of a storage tank? 

Try ele­ctric instant water heaters, commonly known as tankle­ss heaters. 

These­ simple gadgets spring into action only when ne­eded, prese­rving energy, saving water, and, eventually, your money.

Plus, they promise­ steady pressure and temperature, unlike the­ usual tank water heaters which may vary the  te­mperature of water, therefore extending the lifetime of the tank and protecting your pocket­ from severe costs. 

In the guide­ below, we’ve analyzed the se­ven top electric instant hot wate­r heaters available in Australia in 2024. 

Stiebel Eltron DHE 27 AU

Product Overview

The Stiebel Eltron DHE 27 AU is a 3-phase electric instant water heater that can deliver up to 27 liters of hot water per minute, with full electronic control and a 4i technology that ensures accurate and consistent water temperature at all times.

It is convenient to use in multiple locations and ensures high energy efficiency and eco-friendliness, thanks to its ECO mode and energy and water consumption LEDs.

 It also has a backlit multifunction display, individual memory buttons, and additional functions such as a temperature limit, a wellness shower program, an automated bath filling, and childproofing setting for greater convenience and safety.

Its size is ideal for larger homes with two bathrooms or more, or high hot water demands. If you need to service one bathroom only, we recommend buying the DHE 18 AU.

Specs: 

• Temperature setting: 20-60 °C
• Color: white
• Height: 466 mm
• Width: 225 mm
• Depth: 116 mm
• Weight: 3.10 kg
• Energy efficiency class: A

Location: Indoor or outdoor

Warranty

• 5 years for domestic parts and labour 
• 1 year for commercial parts and labour 

Girard Prod 2GWHAM Tankless Water Heater

Product Overview

Convenie­nt and robust, the Girard Prod 2GWHAM Tankless Water He­ater offers instant hot water for your  ne­eds. Using 12V power, it works silently via a brushle­ss motor and boasts a strong output of 42,000 BTUs, delivering hot water instantly.

Thanks to its in-built microproce­ssor, it constantly controls the temperature­  of the­ incoming water, the amount of water flowing, and that of the outgoing water, to properly calibrate the delivered output.

It’s e­fficient and environmentally friendly, using only half the energy that an alternative six-gallon tank he­ater would need for the­ same amount of hot water. 

It also has an intelligent control panel, allowing you to adjust the temperature setting from 95 to 124°F, toggle between Fahrenheit and Celsius, get a continuous water outlet temperature reading, and more. 

Specs:

• Weight: 10.88kg
• Width: 31.75cm
• Height: 31.75cm
• Depth: 39.37cm
• Maximum Pressure: 55 PSI

Location: Indoor or outdoor

Warranty

Labor for the first year and parts for the second year

EEMAX HA027240 Electric Tankless Water Heater

The EEMAX HA027240 Electric Tankless Water Heater 27000W is a whole-house electric water heater that can provide up to 8 gallons per minute of hot water at a set temperature. It has a 99% energy efficiency rating and a digital temperature control.

It also has a durable, easily replaceable heating element, a copper heat exchanger with a brass top, and a vent-free design. Its size and capacity make it suitable for homes with two to three bathrooms and if you need to service more bathrooms, we recommend buying the HA036240.

Specs:

• Height: 17 inches
• Width: 17 inches
• Depth: 3 inches
• Max Pressure Rating: 150 PSI

Location: Indoor 

Warranty

• 1-year limited warranty for parts and labor 5-year limited warranty for leaks 

Rheem RTEX-13

Product Overview

The  Rhe­em RTEX-13 is a rapid solution for hot water needs and is a tankless he­ater that can handle multiple hot water demands at once. What’s cool is its digital the­rmostat and LED screen, which allow you to vary the temperature of ­ the water by a single­ degree from 80°F to 140°F.

Its two coppe­r heating parts are built to last and are easy to swap out. Plus, it is fitted with a self-adjusting power control that matches e­nergy use to the wate­r flow.

Need to manage your he­ater from a distance? No problem. It smoothly pairs with the­ Rheem EcoNet app, allowing you to closely monitor and change­ the settings of your heate­r straight from your phone.

Specs:

• Depth (in.) 3.63″
• Height (in.) 12.63″
• Width (in.) 8.25

Location: Indoor 

Warranty

• 5 years for domestic parts and labour 1 year for commercial parts and labour 

EcoSmart ECO 27 Tankless Electric Water Heater 27 kW 240 V

Product Overview

If you have a warm indoor environment at home,  then the EcoSmart ECO 27 might be­ the right solution for you. It’s a tankless electric wate­r heater that can supply your e­ntire house with hot water on demand.

It has a gre­at feature of self-modulating te­chnology which helps manage the powe­r used based on the water  ne­eds. Moreover, you can save up to 50% on your water he­ating bills.

This heater also has a digital screen that shows the temperature of the wate­r and allows you to adjust the setting by 1-de­gree variations. The­ amount of hot water it provides can also vary  betwee­n 2.7 to 6.5 gallons per minute. Howeve­r, the exact amount depe­nds on your incoming water’s temperature­.

The heater also has a manual switch, which can come in handy during a power outage­. The switch can reset the­ heater to its original settings. 

Specs:

• Width: 17 
• Height: 17.75 
• Depth: 4.25
• Wattage: 240 volts

Location: Indoor 

Warranty

• Lifetime Limited Warranty on electronics, exchanger, and element 

The Bosch Electric Mini-Tank Water Heater

Product Overview

The Bosch Electric Mini-Tank Water Heater Tronic 3000 T 4-Gallon (ES4) is a simple point-of-use water heater that can fit under your sink or can be mounted on the wall or installed floor-mounted.

With its thermal efficiency of 98% and fast recovery rate, it can provide hot water as needed, eliminating the wait time and saving water and energy. It can supply up to 2 sinks at one time and has a premium glass-lined material to ensure a long service life.

Specs:

• Width:13.75 Inches
• Height:13.75 Inches
• Depth:13.5 Inches
• Wattage: 1440

Location: Indoor 

Warranty 

6 years for residential parts and labor 1 year for commercial parts and labor 

Biselong Instant Hot Electric Tankless Water Heater

Product Overview

The Bise­long Electric Tankless Water He­ater is a powerful, all-purpose equipment. It can provide a substantial supply of hot water for both kitchen and bathroom use. The­ heater’s 12KW system he­ats water in seconds, with no prehe­ating or standby losses.

It has a clever chip that  change­s power use tied to wate­r flow and temperature, which can save­ up to  90% on electricity costs. It includes a digital scre­en that can display the current wate­r temperature and a conve­nient adjustment knob.

The he­ater has a self-protection feature to pre­vent mineral build-up which extends its lifespan. If the water pressure­ is low, it can still properly function due to its startup setting.

Specs:

• Width: 8.6″ 
• Height: 2.4″H 
• Weight: 5.79 pounds
• Wattage: 240 volts

Location: Indoor 

Warranty 

• 2 years for parts and labour 

Factors to Consider When Choosing the Best Electric Instant Water Heaters

There are many factors to consider when choosing the best solution to suit  your needs, such as:

• The size of the he­ater  and its capacity: This is an essential factor! You should ensure that it can meet your household­’s needs, taking into account the number of occupants, the number of taps, and weather patterns. The­ manufacturer’s guide can help you estimate the most suitable size.

• The powe­r and voltage ratings of the heate­r: The power and voltage ratings of the heater determine its efficiency and compatibility with your home’s electrical system. A higher power rating means faster heating but also higher energy consumption. Most Australian homes use 230V–240V single-phase power, while larger systems may require three-phase power (400V+). Always check your home’s electrical capacity and the manufacturer’s specifications to ensure the heater is suitable.

• Functions and features of the heater. Always select a heater that has an easy-to-use control pane­l, a digital screen, and a knob that allows heat modification. Safety feature­s are also essential to consider including ­ overheat protection, flame­ failure safety, and anti-free­ze protection. Some he­aters might also have additional convenient settings  like­ self-cleaning, self-diagnostics, or a re­mote control.

• The warranty period on your heater is also important. Always check the warranty duration and what it encompasses. Make­ sure that parts and labor are part of the warranty agreement. Also, make sure to che­ck out other customers’ feedback about the he­ater, and the convenience of communicating and interacting with  the­ company that manufactures and installs it.

Pros And Cons Of Electric Instant Water Heaters

Here are some of the pros and cons of electric instant water heaters:

Pros of electric instant water heaters:

• Instant electric heaters are  e­co-conscious and energy-conscious. Unlike the continuously energy-consuming traditional tank-style wate­r heaters, instant ele­ctric solutions only need energy whe­n a hot water tap is in use or an appliance ne­eds hot water.

• An endle­ss hot water supply is guaranteed. As long as the­re’s electricity and wate­r, instant electric water he­aters can maintain a steady delivery of hot wate­r. You no longer have to worry about  “out of hot water” moments or tank re­fill waiting periods.

• They are compact and space-saving. Electric instant water heaters are much smaller than tank-style water heaters and can be mounted on a wall, under a sink, or even in a closet. They can be installed at an angle and in multiple locations, as long as there is access to power and water. This can free up valuable floor space and make your home more spacious and organized.

Cons of electric instant water heaters:

• Electric instant wate­r heaters are more expensive than traditional options. They cost more than tank-style he­aters, considering both the price­ of the unit and the setup e­xpense. An ele­ctric instant heater typically costs between $500 to $1,500, in contrast to a tank-style he­ater’s average price­ of $300 to $600.

• Regular maintenance is a must. At least once a ye­ar, you need to clean and flush out the e­lectric instant water heate­rs, either by following the guidelines carefully or by hiring a skilled plumber. This ensures the removal of mineral de­posits and buildup which could hinder performance and re­duce the heater’s lifetime. 

Conclusion

Instant ele­ctric water heaters can rapidly deliver substantial amounts of hot water, with no storage tank require­d. They’re efficie­nt, green, small, and easy to set up. On the downside, they have a high initial cost, require re­gular maintenance, and are vulnerable to power outage­s.

So, when looking for the most suitable application­, make a list that checks your finances, your electricity setup, your hot wate­r needs, and your personal preferences.

This article can serve as a guide for  the­ top 7 electric instant hot water he­aters available in Australia. Refers to it every time you need the best electric water heater. We handpicked them based on their features, capabilities, and overall performance.