Hot Water Systems in Thornlie
The 6108 postcode, covering Thornlie and surrounding areas, is home to around 8,913 households. With many households already generating their own clean solar power, many are now looking at how they can make their entire home energy system more efficient, with hot water heating often the logical next step.
With hot water roughly accounting for a quarter of the average home's energy use, switching to an energy-efficient hot water system is one of the biggest opportunities for savings. Across Thornlie and the 6108 area, 1,631 homeowners have already switched from older electric storage and gas hot water systems to solar hot water or air-source heat pump systems that draw on clean, renewable power while also claiming the hot water rebates to reduce their hot water heater system cost. These highly-efficient systems not only help cut energy bills but also reduce carbon emissions and improve overall energy independence.
With Thornlie's climate delivering an average of 5.3 kWh/m² per day, conditions are ideal for hot water systems and hybrid heat pump systems that harness both sunlight and ambient air temperature to heat water efficiently all year round. When paired with existing rooftop solar power or solar batteries, the result is hot water that costs far less to run and is powered by clean, self-generated energy.
Hot Water Ranking
Postcode 6108
33rd
State Wide
154th
Australia Wide
Hot Water Installation Thornlie
Estimated daily energy to heat household water, comparing a resistive electric element with a high-efficiency heat pump. Demand shifts month-to-month using local climate patterns.
Energy Efficient Hot Water & Solar Power Thornlie
* Data from the Bureau of Meteorology. Closest station: N/A.
Solar Powered Hot WaterThornlie
Illustrates how a typical 6.6 kW rooftop solar system can offset the daytime energy demand of a COP 5 heat pump hot water unit.
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Heat Pump Hot Water Systems for Thornlie
Compare heat pump hot water systems suitable for Thornlie's climate. These energy-efficient systems are designed to work in local temperature conditions and can significantly reduce your hot water energy costs.
Community Hot Water Statistics - Thornlie, 6108
Hot Water Demographics - Thornlie
Based on the Australian Bureau of Statistics 2021 Census (ABS), Thornlie has around 8,913 private dwellings, home to approximately 22,620 people. With an average household size of 2.7 people, and around 50 litres of hot water used per person each day in Australia, Thornlie households use approximately 135 litres of hot water daily, equating to a massive 1.2 million litres of hot water used across the suburb every single day.
Other census insights reinforce Thornlie's suitability for energy-saving improvements like energy-efficient or solar-powered hot water. The Thornlie community is home to 1,972 couple families with children and 494 one-parent families, meaning a large proportion of households face substantial hot water demand. With 3,578 homes owned with a mortgage and 2,795 owned outright, many residents also have the homeownership and growing equity that make switching to efficient hot water systems a practical way to lower expenses.
Thornlie is converting hot water demand to efficient systems faster than many peers, with 18.3% of dwellings already upgraded.
Hot water systems in Thornlie
Across Thornlie, more homeowners are swapping old gas and ageing electric units for an energy efficient hot water system that is cheaper to run and kinder to the environment. With an average household size of around 2.7 people and more than 8,400 dwellings in the 6108 postcode, reliable hot water is a daily essential – but it does not have to cost a fortune. Many families paying a median mortgage of about $1,625 a month are looking for smarter ways to trim power bills, and upgrading to a modern heat pump hot water system, solar hot water system or efficient electric hot water system is a logical next step.
Thornlie’s sunshine makes it ideal for efficient hot water. Local solar exposure averages about 18.9 MJ/m² per day – roughly 5.25 kWh/m² – which is excellent for both heat pump hot water and any solar hot water heating system. That strong WA sun helps a solar hot water system or all‑electric home with rooftop solar deliver solid year‑round performance, while heat pumps pull free heat from the air to provide some of the most efficient hot water system options on the market. For many households, hot water can account for a big slice of total electricity use, so shifting away from older gas or resistive electric units can unlock meaningful annual hot water energy savings.
In 6108, most homes are separate houses with three or four bedrooms, so hot water demand is steady – morning showers, evening baths and loads of washing. Many of these homes still run gas or older electric units. Swapping to an energy efficient hot water system such as a Sanden heat pump, Rheem heat pump hot water system or a Rheem or Rinnai solar hot water system can cut running costs significantly. Popular brands like Chromagen solar hot water and other leading options vie for the title of best hot water system Australia wide, but the best choice for your place will depend on family size, roof space, tariffs and whether you already have solar.
Typical annual bill savings in Thornlie look like this: • Old electric to heat pump hot water system: around $400–$800 per year • Gas to heat pump vs solar hot water: often $300–$700 per year • Gas to a quality solar hot water system: roughly $300–$600 per year • Old electric to modern electric hot water installation with rooftop solar: about $250–$500 per year, depending on usage and solar size.
Recent years show Thornlie residents are acting on these opportunities. There have already been 1,631 efficient hot water installations – a mix of heat pump hot water installation and solar hot water installation – across the postcode. Installations climbed steadily from the early 2000s, with strong years around 2007–2010, and solid numbers continuing through to 2025. This trend reflects growing local interest in electrification, lower running costs and moving towards the most efficient hot water system options available. As systems age, many households are also booking hot water repair or a solar hot water tank replacement rather than sticking with inefficient gas.
When comparing heat pump vs solar hot water or solar hot water vs electric hot water, it helps to consider both upfront hot water system price and long‑term running costs. Heat pump hot water price can be higher than a basic electric hot water installation, and solar hot water price can vary depending on roof layout and tank size, but rebates make a big difference. Federal Small‑scale Technology Certificates (STCs) effectively discount eligible systems, and there are state‑based hot water rebate WA programs that support heat pump hot water rebate offers, solar hot water rebate options and, in some cases, an electric hot water system rebate when replacing gas. These incentives can reduce the effective hot water system cost by a substantial percentage and shorten payback periods to just a few years, especially if you run the system on timers or use solar‑diversion to soak up excess rooftop solar.
In Thornlie WA, interest in sustainable living is growing as households look to cut bills and emissions. If your current unit is older, noisy or struggling to keep up, it may be time to explore an upgrade – whether that is a rheem solar hot water system, rinnai solar hot water, sanden heat pump or another best heat pump hot water system suited to your home. Talk to experienced local hot water installers who understand hot water WA conditions, tariffs and rebate rules. They can help you compare electric hot water vs gas hot water, run the numbers on solar hot water repair versus replacement, and design an energy efficient hot water solution that future‑proofs your home. To see what is possible for your property and make the most of any hot water rebate WA offers, connect with trusted Thornlie specialists for personalised advice with us.