Hot water system cost calculator
Replacing a hot water system is one of the bigger jobs in the home, and the price swings a lot depending on the type, the size and how much plumbing or electrical work has to change. Set the options below for a realistic Australian ballpark, supplied and installed, before you ring around for quotes.
Price up a hot water system replacement
Heat pump and solar systems cost more up front but run far cheaper and may attract rebates.
Bigger households need more hot water, which means a larger system.
A like-for-like swap in the same spot is the cheapest and quickest job.
A supply-and-install ballpark for Australia, not a fixed quote. A like-for-like swap usually lands around 1,000 to 2,500 installed, with heat pump and solar systems higher before any rebate. Get a survey from a licensed plumber for an exact price.
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What goes into the price
A hot water system quote is really two things added together: the unit itself and the labour to install it. A straight like-for-like swap in the same spot is the cheapest and quickest job. The price climbs when you move to a heat pump or solar system, go up in size, or when the plumber has to relocate the unit, run new gas or water lines, or add wiring and switchboard work.
Choose your system type, set the size, and say whether it is a like-for-like swap or a relocation with new lines.
See a low-to-high cost estimate and a typical mid-point, so you know the ballpark to budget for and what a fair quote looks like.
Use your range to brief two or three licensed plumbers and ask each to look at the job and quote in writing.
Save a one-page PDF of your estimate and options to keep or share when you compare quotes.
Estimate = base unit and install + system type + size + work Why two quotes for the same system look so different
The job is rarely the same twice
Two homes with the same hot water system can be hundreds of dollars apart. An outdoor swap with easy access is cheap labour, an awkward relocation with new gas lines or switchboard work is not. The system type and warranty, the size you need, and how much has to change all move the number, which is why a range is more honest than a single figure.
The job goes to the plumber who answers
When a hot water system fails, most homeowners ring three or four plumbers and book the first good one who actually picks up. The ones who miss the call lose the job to whoever answered. Hey Jodie answers every call 24/7 for plumbing and HVAC firms, takes the details and books the visit - so urgent jobs do not slip away while the plumber is on another call. It books jobs and captures enquiries; it does not give out prices.
Frequently asked questions
How much does it cost to replace a hot water system in Australia? +
For most homes a hot water system supplied and installed lands somewhere between about 1,000 and 2,500. A straight like-for-like electric or gas swap is at the lower end, while a heat pump or solar system pushes it higher, before any rebate. Set the options above for a ballpark closer to your own home.
What affects the price of a hot water system? +
The main drivers are the system type (electric storage, gas, heat pump or solar), the size you need for your household, and how much the plumber has to change. A like-for-like swap in the same spot is cheapest; relocating the unit, running new gas or water lines, and any wiring or switchboard work all add to both the unit and the labour.
Is a heat pump or solar hot water system worth the extra cost? +
Heat pump and solar systems cost more up front than a basic electric or gas swap, but they run far cheaper and often attract government rebates that bring the net price down. Whether they pay off depends on your hot water use, your climate and the rebates available where you live. The calculator shows the up-front range; the running cost is where the savings come.
Is this hot water system cost estimate accurate? +
It is a realistic Australian ballpark based on typical 2026 supply-and-install prices, meant for budgeting and for sense-checking the quotes you get. It is not a fixed quote. Your real price depends on your exact system, your home and the condition of your existing setup, so treat the range as a guide and get a survey before you commit.
How do I get an exact quote for a hot water system? +
Use the range here to set your budget, then ask two or three licensed plumbers to look at the job and quote in writing. A proper quote should list the system make and model, the warranty, the labour, and any extras like a tempering valve, new lines, wiring or relocation. Compare like for like rather than just picking the lowest headline number.
Does the estimate include removing the old system? +
Yes - the base figure assumes a standard installation that includes taking out and removing your old hot water system and installing the new one in the same place. Extras that are not always included, such as relocation, new gas or water lines, switchboard work or a tempering valve, sit on top, which is why the higher end of the range exists.
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