5 Best Tankless Gas Water Heaters in Australia – (Reviews & Guide 2023)

Are you in search of the best tankless gas water heaters in Australia and want to buy a new one? If yes, you have stumbled upon the right page. Read on.

In this best tankless gas water heaters in Australia review, we will list the 5 best tankless gas water heaters in Australia. We will also explore the various types of tankless gas water heaters in Australia, how to size one, and much more.

In the earlier days, we used tank water heaters for showering purposes. Millions of people still use tank water heaters that work on gas. And even though they have their benefits, they are more time and money-consuming. On the other hand, tankless gas water heaters provide you with hot water within just a few seconds.

We live in an age where technological advancement is the new norm. These best tankless gas water heaters in Australia are one such new invention that does not require you to wait any more than just a few seconds for hot water.

As humans make technological advancements, we are also becoming a busy species. And tankless gas water heaters are perfect for busy people who don’t have much time to waste.

However, it is not just any tankless gas water heater that you should buy. If you invest in a low-quality water heater, it has higher chances of breaking down sooner. These breakdowns will cause you to spend more money unnecessarily. Low-quality tankless heaters are made from inferior quality materials and so may take more time to heat water.

If you want a smooth experience, it is best to invest in a high-quality water heater. The higher prices will prove to be beneficial in the long run.

We know that there many high-quality tankless gas water heaters out there with hundreds of brands in the market. To make it easier for you to choose the best one, we have put together this best tankless gas water heater list.

Best Tankless Gas Water Heaters in Australia – What is it? What Size Tankless Water Heater 

As the name suggests, tankless gas water heaters heat water with gas and do not require a storage tank. As we said before, tank water heaters are also available in the market. Tank water heaters take about an hour or less to heat the water. For that reason, they are time-consuming. They also consume more electricity than tankless water heaters to heat up the water.

Best tankless gas water heaters in Australia , on the other hand, use gases like natural gas or propane to heat up the water. With tankless water, you won’t waste any time. All you need to do is switch on the main switch, followed by the hot water tap, and voila! You have hot water flowing within just a few seconds.

Some models take a minute or two to get the hot water flowing. The amount of time a unit takes to dispense hot water depends on its efficiency and the model. Most tankless gas water heaters in Australia dispense hot water immediately after you switch on the hot water faucet, while some others may take a few seconds or a minute or two.

The Best Tankless Gas Water Heater in Australia| Top 5 Picks Tankless Gas Water Heaters in Australia

Rinnai RUC98iN Ultra Series Natural Gas Tankless Water Heater


This Rinnai water heater makes it to the top of our best  tankless gas water heater in Australia list for many solid reasons. Yes, it is a relatively newer model by this manufacturer. But that does not reduce the efficiency it delivers. This is one of the best tankless gas water heaters in Australia we have come across, delivering the highest efficiency and value for money.

It is a concentric model that can be installed using PVC. And since you can install its venting using PVC and not metal, you will save a ton of money here.

It comes in an elegant silver color and a sleek design. So, if you want to buy a cost-effective, high-quality unit and one that looks good, this Rinnai model will not disappoint.

Speaking of being energy efficient, it delivers an energy factor of 0.96 and a uniform energy factor of up to 0.92. The unit also emits ultra-low NOx emissions and can deliver a power of up to 199,000 BTUs. We also love this unit because it is small and saves space, making it perfect for indoor installation.


  • Suitable for indoor installation
  • Safe spacing
  • Sleek design
  • PVC venting option
  •  0.96 Energy Factor and Up to 0.92 Uniform Energy Factor
  • Ultra-low NOx emissions
  • 199,000 max BTU
  • Buy on Amazon

Rinnai RUC98iP Ultra Series Propane Tankless Water Heater


Since this is the second water heater by Rinnai that made it to our best tankless gas water heaters in Australia list, there is something you should know about Rinnai. This Japan-based company is one of the leading manufactures of gas appliances, including gas tankless water heaters. They have been quality water heaters for many decades and have been doing a phenomenal job at it.

This best tankless gas water heaters in Australia is another one of their outstanding units. While the previous Rinnai unit uses natural gas to heat water, this one uses propane. It has the same metallic silver finish as the previous one and would add to the aesthetics of any bathroom or area it is installed in.

This unit, too, offers a BTU of 199,000 and an energy factor of 0.96. The unit also has a unique technology installed that allows it to emit little to no emissions.

If you want to vent this unit using PVC instead of concentric venting, you also have the option to do that. It comes with a solid 12-year warranty on the heat exchanger and a 5-year warranty on all other parts.


  • Uses propane instead of natural gas
  • 0.96 energy factor
  • 199,000 BTU
  • 12-year warranty on heat exchanger
  • Compact and sleek design
  • Buy on Amazon

Rheem RTGH-95DVLN Indoor Direct Vent Tankless Natural Gas Water Heater


This Rheem is another highly rated and trusted gas tankless water heater that we whole-heartedly recommend. One of the most popular units, it has a stunning 4-star rating. What makes this unit a show-stealer is its high-efficiency factor. You will be glad to know that it delivers 94 percent energy efficiency.

The unit achieves this high energy efficiency due to its stainless steel high-quality condensing heat exchanger. With advanced electronic controls, the unit’s energy efficiency and safety increase even more. Another thing we admire about this tankless gas water heater is that it does not emit any harmful emissions. This is because of the low NOx technology.


  • Digital electronic display
  • It can be installed with a two-pipe direct vent system
  • digital remote control
  • Has freeze protection
  • High energy efficiency at 94 percent
  • Buy on Amazon

Gasland BE158 1.58GPM 6L Outdoor Portable Gas Water Heater


This Gasland water heater is a powerhouse and comes with many helpful features. One of the main reasons it made it to our best tankless gas water heaters in Australia list is because of its multiple safety features.

For safety, it has anti-freeze protection in place. It also has the flame failure device and overheating protection in place.

For example, if the water pressure rises above 110 PSI, the heater automatically decreases it for your safety. It’s excellent for outdoor use due to its lightweight and compact design, making it easy to carry. The unit is also very easy to install, making it one of the best units for outdoor use.


  • Advanced combustion technology
  • Energy efficient
  • Excellent safety features
  • Lightweight and compact
  • Buy on Amazon

Eccotemp i12-NG Tankless Water Heater


Lastly, we have this elegant and sleek Eccotemp water heater. We love it for its beautiful and compact design. Its front consists of black tempered glass and a LED display. Not only will it easily fit anywhere in the house, but wherever you fit this unit, it will only add to the aesthetics of that place.

The unit has a decent flow rate of 3 GMP. A 3 GMP unit like this one is perfect for small spaces like bathrooms or kitchen. It activates only when you turn on the hot water tap. Due to the on-demand activation feature, the unit saves a ton of energy and hence is highly energy efficient.


  • Sleek and elegant design
  • LED display
  • Energy efficient
  • Child lock technology and safety feature
  • A flow rate of 3 GPM
  •  Buy on Amazon

Buying Guide For The Best Gas Tankless Water Heater – Buyer’s Guide 2023


Now that you have our list of the 5 best tankless gas water heaters in Australia, you can choose the best one for yourself. However, if you are still confused about which one to buy, explore this extensive buying guide. This buying guide will explore the main features to look for in a tankless gas heater, the different types of gas tankless heaters, and much more.

Things to Consider When Buying A Best Tankless Gas Water Heater in Australia?

Choosing the best tankless gas water heaters in Australia is not as easy as choosing the dinner menu. You have to consider many things to be able to find the one that suits you best. To make the best choice, you might also want to consider the ease of use and the design. The design matters if you want an aesthetically pleasing gas tankless water heater that adds to your bathroom’s beauty.

The main things you need to consider while buying the best tankless gas water heaters in Australia are:


One of the most important things to consider while buying a best tankless gas water heaters in Australia is its power. To put it simply, the more power the water heater has, the better it is for you. You need a water heater that has enough power to supply hot water to your entire family. If you have a large family, then you might want to consider buying a unit with more.

But in general, if you have a small family or a small place, then a tankless gas water heaters in Australia with a power of 10,000 BTUs will be more than enough. But if you have a large family or want a water heater for a larger or commercial space, you will need a water heater that more power, like 1,000,000 BTUs.

Flow rate

Flow rate is another essential feature you need to consider when buying the heater. The flow rate is the quantity of water the heater can deliver per minute. Choose the heater with the appropriate flow rate, keeping in mind how much hot water you and your household will consume.

For example, if you want to power only one faucet in your bathroom with hot water, then a gas tankless water heater with a flow rate of 1GPM (gallons per minute) will be enough. However, if you want to power all the faucets in your entire house with instant hot water, then you will need a unit that has a much higher flow rate.


Venting is another aspect that you need to consider while buying the heater. Without proper venting, the hazardous gases emitted by the gas heater can be harmful to your health. To understand what type of venting your unit needs, consider the two different types of venting systems:

  • The first type of venting is power venting, which comes with an exhaust pipe. Install the vent in such a place that has enough circulation of fresh air.
  • The second type of venting is direct venting. This type of venting comes with an exhaust pipe along with an intake pipe. The exhaust pipe ensures that all harmful gases are eliminated effectively. And the intake pipe ensures that there is sufficient air intake.

Energy factor

The energy factor of each unit determines the amount of energy it uses and its efficiency. The energy factor will also help you understand the cost of operation of that gas tankless water heaters in Australia. Obviously, choose a unit that has a minimal cost of operation and which uses less energy.

To know the unit’s energy factor, look in the product description where the manufacturers mention the figures.

Condensing heaters

There are mainly two types of heaters – non-condensing heaters and condensing heaters. Both of these types of gas tankless water heaters have their advantages and disadvantages.

Condensing water heaters will save you a lot of money during installation. They also emit cooler exhaust air than the non-condensing units. Not to mention, condensing units are far more energy-efficient than non-condensing ones.

Condensing units can also use PVC material rather than metal, which will further help reduce expenses. If you are looking for a unit for outdoor purposes, then a non-condensing unit would be more suitable. They come at a lesser price than the condensing ones and are also smaller in size. Non-condensing units are ideal for camping, mobile homes, and cabins.

Other Factors to Consider- Buying Best Tankless Gas Water Heater in Australia!

It’s always best to buy a best tankless gas water heaters in Australia from a reputable brand. Reputable and trusted brands offer high-quality units that are guaranteed to last for many years to come. They also have better warranty periods, and most importantly, they uphold their warranty claims and ensure all your problems with the unit are solved.

How to Size a Gas Tankless Water Heater?

It’s vital that you buy the best tankless gas water heaters in Australia that suits your needs. The right choice does not always mean going for the expensive one. The right unit will ensure that you receive maximum efficiency. It will also ensure that you don’t spend a lot more money than necessary on the usage, installation, and unit itself.

You need to take two main things into account to size the right unit for yourself – flow rate and temperature control.

Flow Rate

As we mentioned above, the flow is the quantity of hot water the unit can produce. The flow rate also depends on the size of the unit. So, to determine the size, consider the flow rate and the water usage in your household. For example, if you want hot water in all the faucets of your home, then go for a model with a higher flow rate.

The tubs and showers usually use about 2-5 gallons per minute, and the faucets use about 0.75 gallons per minute. So, when choosing the besbest tankless gas water heaters in Australia, take into account the water usage and then select a unit with a flow that can keep up with it.

Temperature Control

The second thing to consider while sizing a unit for yourself is temperature control and rise. The average water temperature is around 50F.

Most people prefer hot water at 115F. That means the unit will have to raise the temperature of the water by 65F. So make sure you choose a unit that is powerful enough to perform this temperature rise. Low quality or less powerful heaters won’t be able to heat up the water to this degree.

So, when it comes to investing in a quality best tankless gas water heaters in Australia, don’t make any compromise, even if they cost a bit more. Or else you’ll regret it later when you’re showering in lukewarm water.

Types of Gas Tankless Water Heaters

There are three types of water heaters available in the market – non-condensing heaters, condensing heaters, and condensing hybrid heaters. Choose the type of best tankless gas water heaters in Australia depending on your budget and your purpose for buying the heater.


Non-condensing technology is a common technology and a well-proven one. It has been used widely in Europe and Japan for many decades. These types of units provide instant hot water within just a few seconds. They use a heat exchanger, and the efficiency factor they can deliver is up to 0.85.

One of the most significant advantages of non-condensing gas tankless water heaters is that they are established. And because they are established, they are highly reliable and have almost no manufacturing defects or issues. And while they have their advantages, they also have a few drawbacks.

You may need to install a few extra stainless steel vents with these units as the exhaust tends to get quite hot. This can lead to a decrease in the overall energy efficiency of the unit.


Condensing units are powerful water heaters. They are also known as the 2nd generation of gas tankless water heaters. These types of units have a second heat exchanger along with a primary one. The second heat exchanger heats the water even more by reusing the heat released by the exhaust.

This process of reusing the heat increases the efficiency of the unit by 94 percent. One of the biggest benefits of these types of units is that you can safely vent them using PVC. The drawbacks include higher costs and decreased efficiency during smaller draws like washing hands.

Condensing Hybrid

These types of units are a new addition and advancement to the gas tankless water heaters niche. They come with an additional small container of approximately 2 gallons—this container stores hot water. And you can use this hot water for smaller draws like washing hands etc.

When you switch on the heater for a smaller draw, it consumes more energy and causes a slight degradation of the unit. When you wash your hands 10 times a day, switching the unit on so many times naturally causes some degradation. Condensing hybrid units solve this problem as they store some hot water for smaller draws.

They not only prevent degradation of the unit but also increase efficiency by 94 percent. You can even vent them using PVC furthering reducing costs. These units have only one drawback. Since this type of technology is new in the market, only small companies manufacture them leading to warranty and manufacturing issues.


Not waiting long hours to enjoy a hot water shower can make your life easy on many levels. Imagine going into the shower and receiving instant hot water. Doesn’t it sound amazing and comforting? A best quality tankless gas water heaters in Australia will bring this comfort to you effectively and efficiently.

We hope the 5 best tankless gas water heaters in Australia list we have provided you with above has given you quality options to choose from. And we also hope our extensive buying guide will help you choose the best tankless gas water heaters in Australia for yourself.

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