Hot Water Systems in St Johns
The 5373 postcode, covering St Johns, Allendale North, Bagot Well, Bethel, Fords, Hamilton, Kapunda and Koonunga and surrounding areas, is home to around 1,559 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 St Johns and the 5373 area, 194 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 St Johns's climate delivering an average of 4.9 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 5373
82nd
State Wide
1043rd
Australia Wide
Hot Water Installation St Johns
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 St Johns
* Data from the Bureau of Meteorology. Closest station: N/A.
Solar Powered Hot WaterSt Johns
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 St Johns
Compare heat pump hot water systems suitable for St Johns'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 - St Johns, 5373
Hot Water Demographics - St Johns
Based on the Australian Bureau of Statistics 2021 Census (ABS), St Johns has around 1,559 private dwellings, home to approximately 3,219 people. With an average household size of 2.3 people, and around 50 litres of hot water used per person each day in Australia, St Johns households use approximately 115 litres of hot water daily, equating to a massive 0.2 million litres of hot water used across the suburb every single day.
Other census insights reinforce St Johns's suitability for energy-saving improvements like energy-efficient or solar-powered hot water. The St Johns community is home to 221 couple families with children and 83 one-parent families, meaning a large proportion of households face substantial hot water demand. With 546 homes owned with a mortgage and 584 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.
St Johns is converting hot water demand to efficient systems faster than many peers, with 12.4% of dwellings already upgraded.
Hot water systems in St Johns
Across St Johns and the wider 5373 area, more households are looking at upgrading to an energy efficient hot water system. With power prices biting and many older gas and electric units nearing the end of their life, options like a modern electric hot water system, a heat pump hot water system or a solar hot water system are becoming the logical next step. Locals enjoy strong sunshine, with average solar exposure around 17.6 MJ/m² per day (about 4.9 kWh/m²), which really helps both heat pump and solar hot water heating system performance. In a postcode with around 1,419 occupied dwellings, a median household income of $1,202 per week and an average household size of 2.3 people, every dollar saved on hot water energy use makes a difference.
St Johns is mostly made up of separate houses, many owned outright (about 584) or with a mortgage (around 546), which means plenty of homeowners are in a good position to plan a hot water upgrade rather than waiting for an emergency breakdown. Swapping an old gas or resistive electric hot water system for an energy efficient hot water system can slash running costs and emissions. A well-sized solar hot water system or the best heat pump hot water system for your needs can often deliver the most efficient hot water system performance, especially when paired with rooftop solar.
In the 5373 postcode, efficient hot water installations have already started to take off. There have been 194 efficient hot water systems installed so far, combining both heat pump hot water installation and solar hot water installation. Installations peaked around 2005–2010, with strong years like 2003, 2005 and 2008, and there is steady ongoing interest right through to 2025. This pattern reflects a community gradually shifting towards electrification, lower running costs and more sustainable hot water SA wide, with more homes choosing options like Rheem heat pump hot water, Sanden heat pump units or solar brands such as Rheem solar hot water and Rinnai solar hot water.
For a typical 2–3 person St Johns household, hot water can be one of the biggest energy users. Moving from older technology to a modern system can deliver real bill reductions. Rough average annual savings can look like this:
• Old electric to heat pump hot water system: $400–$800 per year • Gas to heat pump hot water system: $250–$600 per year • Gas to solar hot water system: $200–$500 per year • Old electric to modern electric hot water installation with rooftop solar: $250–$600 per year
Local homeowners often compare heat pump vs solar hot water, or even solar hot water vs electric hot water, to find the best fit. Heat pumps like Sanden and Rheem can be ideal where roof space is tight or shading is an issue, while a quality solar hot water heating system from brands such as Rinnai or Chromagen solar hot water can suit homes with good north-facing roof area. Many still choose a straightforward electric hot water installation, especially when pairing it with solar PV and off-peak tariffs, or when claiming an electric hot water system rebate.
When it comes to hot water repair and solar hot water repair, St Johns homeowners are also weighing up the hot water system price / cost of fixing an older unit versus replacing it. A new system may look expensive at first, but once you factor in the heat pump hot water price / cost against the long-term savings, it often stacks up well. The same applies to solar hot water price / cost, particularly if you need a solar hot water tank replacement and want to lock in lower bills for years.
Hot Water Rebates, Tariffs & Savings
Across hot water SA, there is growing interest in replacing old gas or electric units with efficient options, and St Johns is no exception. Federal incentives such as Small-scale Technology Certificates (STCs) apply to eligible solar hot water systems and heat pump hot water systems, effectively creating a solar hot water rebate or heat pump hot water rebate that reduces the upfront hot water system price / cost. On top of that, state-based hot water rebate SA programs and electric hot water system rebate offers may be available at different times for approved energy efficient hot water system upgrades. When you combine rebates with smart tariffs, timers or solar diversion to run your system when your PV is generating, the payback period can shrink to just a few years and typical savings can easily reach hundreds of dollars per year.
If you live in St Johns and your current unit is older, noisy or running up big bills, it is a good time to check whether your home is ready for a hot water upgrade. Whether you are moving from gas to an all-electric home, comparing heat pump vs solar hot water, or simply want the best hot water system Australia can offer for your budget, experienced local hot water installers can help. With strong solar resources, a community that values comfort and growing interest in sustainability, efficient hot water systems are a smart way to cut bills, reduce emissions and future-proof your property. Connect with trusted local experts for personalised advice on hot water installation and hot water repair, and find the right solution for your St Johns home or business.