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Choosing the Right Hot Water Heater for Your Home

A hot water heater is an essential part of every household, providing the comfort of warm baths, clean laundry, and clean dishes. However, the process of selecting the right hot water heater can be a daunting task, given the various types, sizes, and energy efficiency levels available in the market. This article aims to help you navigate through these complexities and make an informed decision when choosing a hot water heater for your home. 

Remember, choosing the right hot water system is not just about today, but also about the future. It’s about ensuring you have a reliable supply of hot water while also minimising your energy usage and environmental impact. When it comes to hot water systems, Fremantle Plumbing are ready to provide our expertise—don’t hesitate to contact us today. We’re here to help you make the right choice for your home. 

Understanding different types of hot water heaters

In the world of water heating, there are four primary types to consider: storage tank heaters, tankless heaters, heat pump heaters, and solar heaters. 

Storage tank heaters  

As the most common type of heater, these units keep a large volume of water heated in an insulated tank, ready for use. The capacity can range from small 25-litre units to large 400-litre tanks, depending on the size of your household and your hot water needs. While they are typically the least expensive option upfront, they can be less energy-efficient than other types because of the energy needed to maintain the stored water’s temperature. 

Tankless heaters 

Tankless heaters, also called instant or continuous flow heaters, heat water on demand rather than storing it. This method reduces energy usage, making these heaters more efficient, especially for households that don’t use large volumes of hot water. 

When you turn on a hot water tap, cold water is drawn into the unit and heated instantly by a high-powered burner in a heat exchanger. The unit stops heating once the tap is turned off, further conserving energy. 

Tankless heaters are generally energy-efficient, with ratings of up to 90%. They can save on energy bills, conserve water, and reduce energy waste. They also tend to have a longer lifespan than traditional heaters, and their replaceable parts mean you can often repair rather than replace the unit if issues arise. 

One crucial factor to consider with tankless heaters is their flow rate, measured in litres per minute (LPM), which indicates how much hot water they can deliver at a time. 

Heat pump heaters 

Heat pump heaters are an energy-efficient option for water heating. They work by extracting heat from the air or ground and transferring it to the water, using less energy than traditional heaters that directly generate heat. 

The main components of a heat pump heater are the evaporator, which absorbs heat from the environment; the compressor, which amplifies this heat; and the condenser, which transfers the heat to the water. 

While these systems are most efficient in warm climates, they can be equipped with elements to assist heating in colder weather, making them a versatile option for various Australian climates. They also have the potential to significantly reduce energy consumption and utility costs. 

Solar heaters 

Solar water heaters are a great way to harness Australia’s abundant sunlight for your household’s hot water needs. They primarily consist of solar collectors, usually solar panels, and storage tanks. The solar collectors absorb the sun’s heat and transfer it to a heat-transfer fluid, which then heats the water in the storage tank. 

There are two main types of solar heaters: 

  • Thermosiphon systems: Both the collectors and the storage tank are on the roof. Heated water naturally rises into the tank due to the thermosiphon effect. 
  • Split systems: The collectors are on the roof, but the storage tank is on the ground. The heat-transfer fluid circulates between the two, driven by a pump. 

Solar heaters can meet 50% to 90% of a household’s hot water needs, making them highly energy-efficient and reducing carbon emissions. They do have a higher initial cost, but this can be offset by long-term energy savings and government rebates such as the Small-scale Renewable Energy Scheme (SRES). Most solar heaters also have a gas or electric booster element to ensure a consistent hot water supply during less sunny periods. 

Energy efficiency and environmental impact 

Energy efficiency is a critical consideration in Australia, where energy costs are high and environmental sustainability is a growing concern. The more energy-efficient your hot water system is, the less it will cost to run, and the lower your household’s carbon footprint will be. 

Solar and heat pump water heaters are typically the most energy-efficient. They may have a higher upfront cost, but they can save you a substantial amount of money in the long run through reduced energy bills. Also, the Australian government offers rebates and incentives for installing solar and other high-efficiency hot water systems, further offsetting the initial investment. 

Learn more about the help, such as rebates and incentives, our government is willing to provide to help you find an energy-efficient water heater here

Sizing and capacity 

When it comes to hot water heaters, size really does matter. The right size for your household depends on several factors, including the number of people in your home and your typical water usage. 

A professional, such as a member of the team at Fremantle Plumbing, can help you calculate your peak hour demand—the amount of hot water you use during your busiest hour of the day. For example, a family of four, each taking a 15-minute shower, using a dishwasher, and washing a load of laundry, would require a substantial amount of hot water in a short period. 

Climate considerations 

In Western Australia, the hot and dry climate can significantly influence the choice of hot water heaters. With its warm temperatures and abundant sunlight, this region is ideal for harnessing solar energy or extracting heat from the air. 

  • Solar heaters: Given Western Australia’s ample sunlight, solar heaters can be an excellent option. They absorb solar energy via panels installed on your roof, heating water efficiently and sustainably. A gas or electric booster ensures hot water availability during less sunny periods. 
  • Heat pump heaters: Heat pump heaters, which extract heat from the air to warm water, can also work effectively in Western Australia’s climate. They are highly energy-efficient and can provide considerable savings over time, especially in the warmer months. 
  • Gas or electric heaters: While gas or electric storage tank heaters can work in any climate, their efficiency might not match that of solar or heat pump heaters in Western Australia’s warm and sunny conditions. However, they can be a good choice for households with high hot water demands or for those who prefer a traditional system. 

Costs and budgeting 

Your budget will undoubtedly play a significant role in determining which hot water system is right for you. When considering the cost, remember to factor in both the upfront purchase and installation cost, as well as the ongoing running costs. 

While solar and heat pump systems tend to have higher upfront costs, they generally have lower running costs, making them more economical over the long term. In contrast, traditional storage tank systems usually have lower upfront costs but higher operating costs due to lower energy efficiency. 

Remember, the Australian Government offers various rebates and incentives for installing certain high-efficiency hot water systems, which can significantly reduce your initial outlay. 

Installation and maintenance 

When choosing a hot water heater, it’s also important to consider installation and maintenance requirements. Some systems, like solar heaters, might require more complex and costly installation procedures. You’ll need adequate roof space for solar panels and a suitable area for the storage tank. 

In contrast, systems like tankless heaters are relatively easy to install and can even be mounted on an exterior wall to save space. Maintenance requirements also vary between types. Solar systems, once installed, typically require less maintenance than other types, but when maintenance is needed, it can be more costly due to the complexity of the system. 

Durability and warranties 

Hot water heaters are a significant investment, and you’ll want to ensure your chosen system stands the test of time. Research the durability of different models and check what kind of warranty is offered. Typical warranties for hot water systems can range from 5 to 12 years. A longer warranty can provide peace of mind, but it’s also important to understand what the warranty covers. Get in touch with the friendly team at Fremantle Plumbing to find out what warranties we offer on our various hot water systems and installations. 

Did you know that Fremantle Plumbing have been the blocked drains Perth experts since 1952? If you need an emergency plumber Perth, don’t hesitate to get in touch—we’ll have your plumbing back up and running in no time at all. 


Choosing the right hot water heater for your home is a significant decision that requires careful consideration. From the type of heater that suits your needs, the energy efficiency level, the size and capacity, to the costs and maintenance, you need to consider all these factors before making a decision. 

While this article provides a comprehensive guide, every home and household is unique, and what works best for one might not work as well for another. That’s where professional advice can make a huge difference. The team at Fremantle Plumbing is always ready to assist you in making an informed decision, providing expert advice tailored to your specific needs and circumstances. 

Contact Fremantle Plumbing today to discuss your hot water needs. We can help you select and install the perfect system for your home, ensuring you enjoy a reliable and efficient hot water supply for years to come. 

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