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How much does it cost to install a hot water system in Australia? It’s a question most homeowners eventually face, especially when their current unit stops working or energy bills start creeping up. The answer isn’t the same for everyone—it depends on the type of system, how efficient it is, and what installation involves.
This guide will walk you through the key factors affecting the cost of a hot water system. We’ll cover system types, price ranges, installation variables, and ongoing costs so you can make a better-informed decision.
Installing a hot water system is more than just buying a tank and plugging it in. Several elements determine the final price.
System type plays the biggest role. Electric, gas, solar, and heat pump systems all differ in price, performance, and complexity.
The size of the household matters too. A two-person apartment doesn’t need the same capacity as a five-person family home.
Next comes installation complexity. If you’re replacing an old system with the same type in the same location, it’s usually simple. But switching from electric to gas, or adding solar panels? That needs more work and costs more.
Also, energy efficiency impacts both upfront and ongoing costs. A more efficient system may cost more initially but will save you money over time.
Electric units are common across Australia, particularly in older homes or apartments. They’re often the cheapest to install.
Electric hot water systems price: $300 to $1,500
Installation cost: $300 to $700
Total cost: $600 to $2,200
Electric systems are easy to maintain, but unless you’re on an off-peak electricity plan, they can be expensive to run. If you’re replacing an older model, electric hot water system replacement cost is usually lower than switching to something new.
Some opt for instant electric hot water system price models. These provide water on demand but require specific electrical wiring upgrades.
If your home has a gas connection, this type might be ideal. Gas systems heat water quickly and can handle high-demand households.
Hot water systems price (gas): $800 to $1,800
Installation: $500 to $1,000
Total: $1,300 to $2,800
They tend to be cheaper to operate than electric systems in the long run. Replacing gas with gas is straightforward, while switching from electric may require additional pipework.
Solar systems are growing in popularity because they reduce energy bills over time. However, their upfront cost is higher.
Solar hot water system cost: $3,000 to $7,000
Installation: $2,000 to $4,000
Total: $5,000 to $11,000
Some homes qualify for rebates, reducing the cost of a solar hot water system. If the storage tank alone is damaged, solar hot water tank replacement cost ranges from $1,200 to $2,500.
These units extract heat from the air to warm water. They’re efficient and suitable for homes that want low running costs.
Heat pump hot water prices: $2,500 to $4,000
Heat pump installation cost: $1,000 to $2,000
Total: $3,500 to $6,000
They run on electricity but use much less than traditional electric systems. If you’re wondering about the cost of heat pump hot water system, remember to factor in your climate—these systems work best in warmer zones.
Installing a system from scratch costs more than replacing an existing one. You may need gas lines, new plumbing, or electrical upgrades.
New hot water system cost: $1,200 to $4,000 or more
This depends on your home’s layout, access, and the type of system
Understanding how much does a new hot water system cost helps you plan ahead, especially during renovations or new builds.
If your current unit is leaking or outdated, replacing it might be more cost-effective than repairing it again and again.
Hot water system replacement cost: $800 to $2,500
Hot water replacement cost (with type switch): up to $3,000
Swapping like-for-like is cheaper. If you’re switching from electric to solar, though, the costs rise due to the installation of panels, boosters, or new infrastructure.
Even replacing just the tank (like a hot water tank replacement cost or hot water cylinder replacement cost) can range from $900 to $2,000 depending on the model.
It’s not just the installation you need to consider—ongoing maintenance adds to the total cost over time.
Hot water system service cost: $150 to $300 annually
Hot water service replacement cost: $800 to $2,000 when major parts fail
Regular servicing helps extend your unit’s life and keeps energy use in check. Skipping it might save money now but cost you more later.
Let’s say you’re going from gas to electric or vice versa. This isn’t just a quick change—it often means electrical upgrades, plumbing adjustments, and reconfiguring storage areas.
Cost to replace hot water system in this case: $2,000 to $4,000
You may also need council approval or compliance certificates
Switches like this also apply when upgrading from a storage tank to an instant system.
Here’s a breakdown of what you might expect:
Electric: $600 to $2,200
Gas: $1,300 to $2,800
Solar: $5,000 to $11,000
Heat pump: $3,500 to $6,000
New install: $1,200 to $4,000+
Replacement: $800 to $2,500
Tank-only replacement: $900 to $2,000
These are estimates. Actual pricing depends on brand, system size, access, and installer rates.
You’ve probably seen the Bunnings hot water installation cost advertised as a package. These usually include the unit, installation, and old unit removal.
They can be cost-effective, but only for standard replacements. If your job needs relocation, upgrades, or a type switch, expect extra charges.
Always read the terms before booking.
Wondering how to install hot water system Australia legally? The short answer: don’t do it yourself.
You must hire a licensed plumber or electrician. DIY installs can void your warranty, breach building codes, and even impact home insurance.
Here are a few tips to reduce expenses without compromising safety:
Get at least 2–3 quotes
Stick with the same energy type when replacing
Check for government rebates (solar, heat pump)
Schedule installs during off-peak periods
Choose the right size—not too big, not too small
If your current unit is 8+ years old, start budgeting now rather than waiting for an emergency.
Replacing or installing a new hot water system isn’t cheap, but it’s necessary. Electric systems are affordable upfront, while solar and heat pumps offer better energy savings in the long run.
Whatever you choose, make sure it suits your home, family size, and energy usage. And most importantly, work with licensed professionals who understand the technical and legal side of the job.
If you’re based in South Australia, reaching out to a qualified plumber in Adelaide will help you get accurate advice, quality installation, and peace of mind that the job’s done right.
Published: 28 April, 2025
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