What Is a Hot Water System?
A hot water system is the unit in your home that heats and delivers hot water whenever you need it. Think of it as the “engine” behind your hot shower, the warm water in your washing machine, or the hot tap in your kitchen sink.
Instead of heating water on the stove every time, a hot water system does the job automatically and stores or delivers it through your taps.
There are a few main types:
- Electric hot water systems – use electricity to heat water.
- Gas hot water systems – use natural gas or LPG.
- Solar hot water systems – use energy from the sun, with a backup booster for cloudy days.
- Instant (or continuous flow) systems – heat water only when you turn on the tap, so you don’t run out.
- Hot water tanks – store heated water, ready for use at any time.
Uses of Hot Water Systems:
Hot water systems aren’t just a luxury – they’re an everyday necessity in modern Australian homes. You may not notice how much you rely on hot water until you don’t have it. Here’s a deeper look at the main uses:
1. Daily Bathing and Showers
- Taking a warm shower after work or school is something many Australians consider essential, especially during winter.
- Warm water helps you relax, soothes muscles, and improves circulation.
- Families with kids or elderly members rely heavily on consistent hot water for hygiene and comfort.
- Hot water also supports skin health, as cold water alone often doesn’t clean oils and dirt effectively.
Imagine running late for work and stepping into a cold shower it’s not only uncomfortable, it can start your day on the wrong note. That’s why a reliable hot water system is so valuable.
2. Washing Clothes
- Many modern washing machines adjust water temperature, but warm or hot water cycles are still important for removing stains, oils, and bacteria.
- Hot water cycles are especially helpful when washing bedding, towels, or baby clothes where hygiene is a priority.
- For families in regional areas dealing with mud, grease, or heavy work uniforms, hot water makes a huge difference in cleaning power.
Without a good hot water supply, clothes may not come out as fresh, clean, or sanitised.
3. Cooking and Food Preparation
- Hot water is often needed for cooking tasks from boiling pasta faster to steaming vegetables.
- Washing fresh produce with warm water helps remove dirt and bacteria more effectively.
- In the kitchen sink, hot water is crucial for rinsing dishes, cutting boards, and utensils after handling raw meat, ensuring food safety.
A kitchen without reliable hot water can quickly become unhygienic and inconvenient.
4. Cleaning and Dishwashing
- Whether you use a dishwasher or wash by hand, hot water is essential for breaking down grease and sanitising dishes.
- Warm water also helps when cleaning floors, bathrooms, and surfaces it kills more germs than cold water alone.
- Households with pets often use hot water for disinfecting feeding bowls or cleaning up messes.
Without hot water, you’ll spend more time scrubbing, and your home may not feel as clean.
5. Home Heating (in Certain Systems)
- Some advanced hot water systems in Australia are connected to underfloor heating or hydronic heating systems.
- These setups circulate warm water through pipes to heat your living spaces.
- While not as common as in colder countries, some Australian homeowners, especially in cooler regions like Canberra or Tasmania, choose this option for consistent warmth.
This dual-purpose use means your hot water system not only provides showers but also keeps your whole home cosy in winter.
6. Special Household Needs
- Families with newborns use hot water for sterilising bottles and baby items.
- People working in trades (mechanics, builders, farmers) often need warm water for heavy-duty cleaning after work.
- Hot water also supports better hygiene when washing hands, especially during flu season.
These smaller but important uses highlight how much you depend on reliable hot water daily.
Why Your Hot Water System Choice Matters
Many Aussies think all hot water systems are basically the same turn on the tap, and hot water flows. But the truth is, the system you choose can change your daily routine, your running costs, and even your long-term savings.
Here’s why your choice matters:
- Comfort – No more running out of hot water halfway through your shower.
- Bills – Hot water makes up around 25% of the average Australian household energy use. The right system can lower your bills.
- Sustainability – A modern, energy-efficient system reduces greenhouse emissions and helps you do your bit for the environment.
- Future proofing – A well-chosen system can last 10–15 years or more, so you want something that will keep up with your family’s needs.
Electric, gas, solar or heat pump hot water system?
Hot Water Tank Systems
A hot water tank system is the traditional style most Australians grew up with. It stores water in an insulated tank, keeping it hot and ready for use.
Pros:
- Reliable – you always have a supply of hot water ready.
- Simple technology – fewer moving parts compared to modern systems.
- Works with electricity, gas, or solar boosters.
Cons:
- You can run out of hot water if the tank size is too small.
- Standing heat loss (energy used just to keep water hot).
- Takes up space in your home or backyard.
Installation process:
- A plumber installs a storage tank in your home or yard.
- Tank connects to mains water and power/gas supply.
- Takes a few hours to set up but lasts for years.
Best for: Families who want reliability and don’t mind planning showers around tank capacity.
Solar Hot Water Systems
With plenty of sun across most of Australia, solar hot water systems have become a smart, future-focused choice. These systems use roof-mounted solar panels to heat your water, with a gas or electric booster for cloudy days.
Pros:
- Can reduce water heating bills by up to 60–80%.
- Environmentally friendly, cutting carbon emissions.
- Long-lasting with low running costs.
Cons:
- Higher upfront cost.
- Needs roof space and good sun exposure.
- Performance depends on weather and location.
Installation process:
- Solar panels installed on your roof.
- Tank connects to panels and water system.
- Backup electric or gas booster ensures hot water during cloudy days.
Best for: Homeowners planning to stay long-term, who want big savings and a smaller environmental footprint.
Electric Hot Water Systems
Electric hot water systems heat water using an element inside the tank. They’re common in older homes but becoming less popular due to high energy costs.
Pros:
- Affordable upfront.
- Simple to install.
- Works in almost any home.
Cons:
- Expensive to run (especially on peak electricity tariffs).
- High greenhouse gas emissions unless paired with solar PV.
- Slowly being phased out in some states.
Installation process:
- Straightforward, usually takes less than a day.
- Works by connecting a tank to electricity.
Extra point:
- Works well with solar panels if you want to offset power usage.
Best for: Smaller households or rentals where upfront cost matters more than long-term savings.
Instant Hot Water Systems (Continuous Flow)
An instant hot water system heats water only when you need it, instead of storing it in a tank. That means no more cold showers just because the tank’s empty.
Pros:
- Endless hot water.
- Compact design – fits on the wall, no bulky tank.
- Energy efficient – no energy wasted on storing hot water.
Cons:
- Limited flow – may struggle if multiple showers and appliances run at once.
- Needs gas connection or high electric demand.
- Can cost more to install.
Installation process:
- Mounted on a wall, connects directly to pipes.
- Needs professional installation but minimal space.
Best for: Smaller households, apartments, or anyone tired of running out of hot water.
Comparing Your Options
| System Type | Upfront Cost | Running Cost | Best For | Downsides |
|---|---|---|---|---|
| Hot Water Tank | Low–Medium | Medium–High | Families needing reliability | Can run out, heat loss |
| Solar Hot Water | High | Low | Long-term savings, eco-friendly | Weather-dependent |
| Electric Hot Water | Low | High | Rentals, budget installs | Expensive to run |
| Instant Hot Water | Medium | Low–Medium | Small households, space saving | Limited flow capacity |
How to Decide Which Hot Water System Suits You
When choosing, think about these factors:
- Household Size – How many people live in your home? A family of five will have very different needs to a single person.
- Budget – Are you looking for the cheapest upfront, or the lowest long-term bills?
- Space – Do you have room for a tank, or do you need something compact?
- Energy Source – Do you already have gas, or are you planning to add solar?
- Location – Some systems work better in sunny climates, others suit cooler areas.
Extra Features to Look For
Most guides stop at the basics, but let’s go deeper. Here are features you should consider that others might not mention:
- Smart Controls – Newer systems let you schedule heating times or connect with solar PV for smarter use.
- Water Quality Protection – If you live in a hard-water area, choose a tank with sacrificial anodes to protect from corrosion.
- Government Rebates – Some states offer rebates for installing solar or heat pump hot water systems.
- Noise Levels – Heat pumps can be a bit noisy, so check installation placement.
- Warranty Length – Tanks often fail at seams or rust. A long warranty gives peace of mind.
Common Mistakes Aussies Make When Choosing
- Going too small – Underestimating your hot water needs is the 1 mistake. Always plan for peak demand.
- Ignoring running costs – Cheap systems often cost more in bills over time.
- Not considering rebates – You could save hundreds by checking government incentives.
- Poor installation – A great system installed badly won’t perform well. Always hire a licensed plumber.
- Forgetting the future – Think about whether your household might grow. Kids, guests, or renovations all affect demand.
Keeping Your Hot Water System in Top Shape
Once you’ve chosen your system, maintenance keeps it running smoothly:
- Test the pressure relief valve once a year.
- Flush the tank every 6–12 months to prevent build-up.
- Replace sacrificial anodes in tanks every few years.
- Keep an eye on leaks around pipes and fittings.
- Book regular servicing with a licensed plumber.
Hot Water System Maintenance Tips
Choosing the right system is step one. Keeping it running smoothly is just as important.
- Check the pressure relief valve yearly.
- Flush the tank every 6–12 months to prevent sediment build-up.
- Inspect for leaks around pipes and fittings.
- Replace sacrificial anodes in tanks every 4–5 years.
- Book regular servicing with a licensed plumber.
Hot Water Systems Across Australia: Location Matters
Not every system works equally well across the country. Here’s what to consider:
- Queensland & Northern Territory – Solar hot water is excellent thanks to consistent sun.
- New South Wales & Victoria – A mix of solar, heat pump, or instant gas depending on your home.
- South Australia – Strong solar exposure makes renewable options popular.
- Tasmania – Cooler climate means heat pumps often outperform solar.
- Western Australia – Solar works well in most regions, but instant gas is also common.
Long-Term Benefits of Investing in the Right Hot Water System
- Reduces your household running costs.
- Adds value to your property.
- Supports sustainable living.
- Ensures daily comfort and convenience.
Things Most People Don’t Know About Hot Water Systems
When you think about hot water systems, you probably just think of showers or washing dishes. But there are a few lesser-known facts and tips that can help you get the most out of your system:
1. Hot Water Quality Affects Your Appliances
It’s not just about comfort the quality of your hot water can impact dishwashers, washing machines, and even plumbing. In areas with hard water (common in parts of Australia), minerals can build up inside your hot water tank or pipes, making your system less efficient. Using a filter or descaler can extend the life of your system.
2. Location Matters for Efficiency
Where your system is installed in your home can make a big difference. For example, if your hot water tank is placed far from your bathroom or kitchen, you’ll waste more water waiting for the hot water to reach the tap. A central location or insulated pipes can help reduce this.
3. Solar Hot Water Systems Still Work on Cloudy Day
A common myth is that solar hot water systems only work in sunny weather. In reality, they can still heat water on cloudy days — and most are fitted with a booster (electric or gas) so you’ll always have hot water available.
4. Instant Systems Save Space
If you live in a small apartment or town house, an instant (continuous flow) hot water system can be a game-changer. Because it doesn’t need a large storage tank, it can be mounted on a wall outside, freeing up valuable indoor or outdoor space.
5. Regular Servicing Saves Money Long-Term
Many homeowners forget about their hot water system until it breaks down. But just like a car, regular servicing can prevent problems. A plumber can check for leaks, sediment build-up, or faulty valves — small issues that, if left unattended, can cost thousands later.
6. Some Systems Can Be Integrated with Smart Home Technology
Modern systems are becoming “smarter.” You can now connect certain electric or solar systems to timers, apps, or smart meters. This lets you heat water at off-peak times when electricity is cheaper, reducing bills without losing comfort.
7. Hot Water Systems Play a Role in Sustainability
Heating water is one of the biggest uses of energy in an average Australian home. By choosing an energy-efficient system (like solar or heat pump), you’re not only saving money but also cutting your household’s carbon footprint an important step as Australia works towards greener living.
FAQs About Hot Water Systems in Australia
Q: What’s the cheapest hot water system to run in Australia?
A: Solar hot water with a booster or a heat pump are usually the most affordable in the long run.
Q: How long do hot water systems last?
A: On average, 10–15 years depending on type, usage, and maintenance.
Q: Can I install a hot water system myself?
A: No. In Australia, only licensed plumbers can install hot water systems.
Q: Do I need council approval to install a hot water system?
A: In most cases yes, especially for solar installations. Check with your local council.
Q: Should I go solar or instant?
A: It depends on your household. Solar is better for long-term savings, while instant is best for smaller homes that want endless hot water.
Q:How do I know what size hot water system I need?
A: Choose based on household size, usage patterns, and system type.
Q: Do I need a booster with a solar hot water system?
A: Yes, to ensure hot water on cloudy days or at night.
Q: Can hot water systems handle hard water?
A: Yes, but using a water softener or regular descaling is recommended.
Q: Are hot water systems noisy?
A: Modern systems are mostly quiet; minor expansion noises are normal.
Q: What safety features should I look for?
A: Temperature control, pressure relief valve, and automatic shut-off for safety.
Q: How can I make my hot water system more energy-efficient?
A: Use insulation, timers, solar options, and high-efficiency models.
Q: Can I upgrade an old hot water system without replacing plumbing?
A: Often yes, with minor adjustments to pipes or valves.
Q: Do I need to service my system every year?
A: Annual or biennial servicing is recommended to maintain efficiency and lifespan.