If you’re thinking about upgrading or replacing your hot water system, one of the first questions you’ll have is: how much does it actually cost?
In Australia, hot water system prices can range from around $800 for a small electric tank (supply only) up to $5,000+ for a large solar or premium heat pump system fully installed.
The total price depends on:
- Type of system (electric, gas, solar, heat pump)
- Tank size & brand
- Installation costs
- Your city or state
- Any government rebates available
Let’s break it down in detail.
How much does an electric hot water system cost?
Electric storage tanks are usually the most affordable to buy and install.
| Tank size | Supply only (approx.) | Fully installed* |
| Small (25–50L) | $800–$1,200 | $1,100–$1,800 |
| Medium (80–125L) | $1,000–$1,400 | $1,400–$2,200 |
| Large (250–315L) | $1,200–$1,700 | $1,800–$2,800 |
*Prices vary based on location and site conditions.
How much do gas hot water systems cost?
Gas systems cost a little more upfront but can be cheaper to run, especially if you already have mains gas.
| Type | Supply only (approx.) | Fully installed |
| Gas storage (135–170L) | $1,000–$1,600 | $1,800–$2,800 |
| Continuous flow (instantaneous) | $900–$1,500 | $1,700–$2,800 |
How much do solar hot water systems cost?
Solar systems have the highest upfront cost but the lowest long-term running costs.
| System type | Supply only (approx.) | Fully installed |
| Roof-mounted tank system | $3,000–$5,000 | $4,000–$6,500 |
| Split system (tank on ground) | $3,500–$5,500 | $4,500–$7,000 |
State rebates and STCs (Small-scale Technology Certificates) can reduce the price.
How much does a heat pump hot water system cost?
Heat pumps are growing in popularity for their efficiency.
| Size & brand | Supply only (approx.) | Fully installed |
| Standard household (200–300L) | $2,500–$3,500 | $3,000–$4,500 |
Hot water system prices by Australian city & state
Prices vary due to installation rates, demand, climate, and local rebates.
| City / State | Typical install cost (standard electric 250L) |
| Sydney (NSW) | $1,800–$2,500 |
| Melbourne (VIC) | $1,700–$2,400 |
| Brisbane (QLD) | $1,700–$2,300 |
| Perth (WA) | $1,600–$2,300 |
| Adelaide (SA) | $1,800–$2,500 |
| Canberra (ACT) | $1,900–$2,600 |
| Hobart (TAS) | $1,800–$2,400 |
How much is a hot water system in Adelaide?
In Adelaide, you can expect to pay:
- Electric storage system (250L): $1,800–$2,500 fully installed
- Gas storage: $1,900–$2,800
- Continuous flow gas: $1,700–$2,800
- Solar hot water: $4,000–$6,500 (after rebates)
- Heat pump: $3,000–$4,500
Local water quality, building type and access can also affect installation cost.
For detailed Adelaide pricing and advice, visit SA Hot Water.
Why do prices vary so much?
- Size and brand: Premium brands cost more but often last longer.
- Installation complexity: Upstairs, tight spaces, or switch from gas to electric add cost.
- Rebates: Government and solar incentives can cut thousands off the price.
- Your location: Regional installs may cost more due to travel or supply.
What other costs should you budget for?
- Removal of your old system: usually $100–$300
- New valves, pipework or electrical work
- Upgrading gas lines or adding tempering valves (now required by law)
A professional installer will quote these so there are no surprises.
Is it worth paying more upfront for solar or heat pump?
Yes — if you can afford the upfront cost, these systems often pay for themselves in 3–7 years through lower running costs.
They’re especially popular in Adelaide because of mild winters and strong sunshine.
Need a detailed quote?
The best way to get accurate pricing is to book a site visit.
At SA Hot Water, we provide:
- Free quotes tailored to your home & usage
- Advice on which system type saves you the most long-term
- Fast, professional installation by licensed local plumbers
FAQ: How much is a hot water system?
What is the cheapest hot water system?
A small electric storage tank, starting around $800 supply only.
How much does it cost to replace a hot water system?
Typically $1,800–$2,500 in Adelaide for a standard electric unit.
Do I get rebates for solar or heat pump systems?
Yes — federal STCs and sometimes state rebates can cut $1,000+.
Does size affect price?
Yes — bigger tanks or higher flow rates cost more.
Is installation included in online prices?
Often no — check if quoted price is supply only or fully installed.