Replacing a hot water system is one of those jobs that usually can't wait — when it fails, you need it fixed fast. That urgency is exactly when people get overcharged. This guide covers what hot water system installation actually costs in Australia in 2026, which system type suits your situation, and what to watch out for when getting quotes.
Hot water system installation cost by type
| System Type | Unit Cost | Installation | Total Installed |
|---|---|---|---|
| Electric storage (small, 125L) | $400–$700 | $300–$500 | $800–$1,300 |
| Electric storage (large, 250–315L) | $500–$900 | $350–$600 | $900–$1,600 |
| Gas storage (continuous) | $600–$1,200 | $400–$700 | $1,000–$1,800 |
| Continuous flow (gas) | $700–$1,400 | $500–$800 | $1,200–$2,200 |
| Heat pump | $1,400–$2,800 | $600–$900 | $2,200–$4,500 |
| Heat pump (after rebates) | STC rebates reduce cost by $300–$700 | $1,500–$3,800 | |
| Solar hot water | $2,000–$4,000 | $800–$1,200 | $3,000–$6,000 |
Installation includes removal and disposal of old unit. Prices vary by city and access difficulty.
Which type is right for you?
Heat pump — best long-term value
- 70–75% cheaper to run than electric storage
- STC government rebates apply ($300–$700 off)
- Pays back in 3–5 years vs electric
- Needs outdoor space and adequate airflow
- Higher upfront but best 10-year economics
Continuous flow gas — best for large households
- Unlimited hot water — never runs out
- Only heats water when needed
- Requires gas connection
- Lower running cost than electric storage
- Popular in Sydney, Melbourne, Brisbane
Installation cost by city
| City | Electric (250L) | Gas Continuous Flow | Heat Pump |
|---|---|---|---|
| Sydney | $950–$1,600 | $1,400–$2,400 | $2,500–$4,800 |
| Melbourne | $900–$1,500 | $1,300–$2,200 | $2,400–$4,500 |
| Brisbane | $850–$1,400 | $1,200–$2,000 | $2,200–$4,200 |
| Perth | $850–$1,450 | $1,200–$2,100 | $2,300–$4,300 |
| Adelaide | $800–$1,400 | $1,100–$1,900 | $2,200–$4,000 |
| Canberra | $900–$1,500 | $1,300–$2,200 | $2,400–$4,500 |
Government rebates on hot water systems
Heat pumps and solar hot water systems are eligible for Small-scale Technology Certificates (STCs) — a federal government rebate administered through the installer. The value depends on your location and system size, but typically reduces the installed cost by $300–$700. Most installers apply this as an upfront discount rather than requiring you to claim separately.
Some states offer additional rebates: Victoria's Solar Victoria program, NSW Energy Saving Scheme, and SA retailer rebates. Always ask the installer what rebates apply before accepting a quote.
Got a hot water system quote? Check if it's fair market rate.
Check My Quote →Frequently asked questions
How much does it cost to install a hot water system in Australia?
Electric storage systems cost $800–$1,600 installed. Gas continuous flow costs $1,200–$2,200. Heat pumps cost $2,200–$4,500 before rebates ($1,500–$3,800 after STC rebates). Solar hot water is $3,000–$6,000 installed.
How long does hot water system installation take?
A standard like-for-like replacement takes 2–4 hours. Switching system types (e.g. electric to heat pump, or adding a gas line) can take 4–8 hours and may require a gas fitter in addition to a plumber.
Can I get a rebate on a new hot water system?
Yes — heat pumps and solar hot water qualify for federal STC rebates ($300–$700 discount applied upfront). Some states have additional rebates. Ask your installer to apply all eligible rebates before finalising the quote.
What's the cheapest hot water system to run in Australia?
Heat pumps are 70–75% cheaper to run than electric storage. Gas continuous flow is cheaper than electric storage. Solar hot water has near-zero running cost but high upfront cost. The cheapest to buy and install (electric storage) is the most expensive to run long-term.
Do I need a licensed plumber to install a hot water system?
Yes — hot water system installation must be done by a licensed plumber in all Australian states. Gas work also requires a licensed gas fitter (which many plumbers are, but confirm before booking). DIY hot water installation is illegal and will void your home insurance.
How long do hot water systems last in Australia?
Electric storage: 8–12 years. Gas storage: 10–15 years. Continuous flow gas: 15–20 years. Heat pump: 10–15 years. Solar: 15–20 years for the system, 5–8 years for the booster element. Replacing before failure avoids the emergency premium on labour and parts.